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Astrophysics and Astronomy

Robert A. Gutermuth

Articles 1 - 20 of 20

Full-Text Articles in Physical Sciences and Mathematics

The Jcmt Gould Belt Survey: Evidence For Radiative Heating In Serpens Mwc 297 And Its Influence On Local Star Formation, D. Rumble, J. Hatchell, R. A. Gutermuth, H. Kirk, J. Buckle, S.F. Beaulieu, D.S. Berry, H. Broekhoven-Fiene, M.J. Currie, M. Fich, T. Jenness, D. Johnstone, J.C. Mottram, D. Nutter, K. Pattle, J.E. Pineda, C. Quinn, C. Salji, S. Tisi, S. Walker-Smith, J. Di Francesco, M.R. Hogerheijde, D. Ward-Thompson, L.E. Allen, L.A. Cieza, M.M. Dunham, P.M. Harvey, K.R. Stapelfeldt, P. Bastien, H. Bunter, M. Chen, A. Chrysostomou, S. Coude, C.J. Davis, E. Drabek-Maunder, A. Duarte-Cabral, J. Greaves, J. Gregson, W. Holland, G. Joncas, J.M. Kirk, L.B.G. Knee, S. Mairs, K. Marsh, B.C. Matthews, G. Moriarty-Schieven, J. Rawlings, J. Richer, D. Robertson, E. Rosolowsky, S. Sadavoy, H. Thomas, N. Tothill, S. Viti, G.J. White, C.D. Wilson, J. Wouterloot, J. Yates, M. Zhu Feb 2015

The Jcmt Gould Belt Survey: Evidence For Radiative Heating In Serpens Mwc 297 And Its Influence On Local Star Formation, D. Rumble, J. Hatchell, R. A. Gutermuth, H. Kirk, J. Buckle, S.F. Beaulieu, D.S. Berry, H. Broekhoven-Fiene, M.J. Currie, M. Fich, T. Jenness, D. Johnstone, J.C. Mottram, D. Nutter, K. Pattle, J.E. Pineda, C. Quinn, C. Salji, S. Tisi, S. Walker-Smith, J. Di Francesco, M.R. Hogerheijde, D. Ward-Thompson, L.E. Allen, L.A. Cieza, M.M. Dunham, P.M. Harvey, K.R. Stapelfeldt, P. Bastien, H. Bunter, M. Chen, A. Chrysostomou, S. Coude, C.J. Davis, E. Drabek-Maunder, A. Duarte-Cabral, J. Greaves, J. Gregson, W. Holland, G. Joncas, J.M. Kirk, L.B.G. Knee, S. Mairs, K. Marsh, B.C. Matthews, G. Moriarty-Schieven, J. Rawlings, J. Richer, D. Robertson, E. Rosolowsky, S. Sadavoy, H. Thomas, N. Tothill, S. Viti, G.J. White, C.D. Wilson, J. Wouterloot, J. Yates, M. Zhu

Robert A. Gutermuth

We present SCUBA-2 450 and 850 μm observations of the Serpens MWC 297 region, part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback influences the star formation process and we investigate observational evidence for this by constructing temperature maps. Maps are derived from the ratio of SCUBA-2 fluxes and a two-component model of the JCMT beam for a fixed dust opacity spectral index of β = 1.8. Within 40 arcsec of the B1.5Ve Herbig star MWC 297, the submillimetre fluxes are contaminated by free–free emission with a spectral index …

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A 24Μm Point Source Catalog Of The Galactic Plane From Spitzer/Mipsgal, R. A. Gutermuth, Mark Heyer Jan 2015

A 24Μm Point Source Catalog Of The Galactic Plane From Spitzer/Mipsgal, R. A. Gutermuth, Mark Heyer

Robert A. Gutermuth

In this contribution, we describe the applied methods to construct a 24 μm based point source catalog derived from the image data of the MIPSGAL 24 μm Galactic Plane Survey and the corresponding data products. The high quality catalog product contains 933,818 sources, with a total of 1,353,228 in the full archive catalog. The source tables include positional and photometric information derived from the 24 μm images, source quality and confusion flags, and counterpart photometry from matched 2MASS, GLIMPSE, and WISE point sources. Completeness decay data cubes are constructed at 1' angular resolution that describe the varying background levels over …

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Csi 2264: Characterizing Young Stars In Ngc 2264 With Short-Duration, Periodic Flux Dips In Their Light Curves, John Stauffer, Ann Marie Cody, Pauline Mcginnis, Luisa Rebull, Lynne A. Hillenbrand, Neal. J. Turner, John Carpenter, Peter Plavchan, Sean Carey, Susan Terebey, Maria Morales-Calderon, Silvia H.P. Alencar, Jerome Bouvier, Laura Venuti, Lee Hartmann, Nuria Calvet, Giushi Micela, Ettore Flaccomio, Inseok Song, R. A. Gutermuth, David Barrado, Frederick J. Vrba, Kevin Covey, Debbie Padgett, William Herbst, Edward Gillen, Wladimir Lyra, Marcelo Medeiros Guimaraes, Herve Bouy, Fabio Favata Jan 2015

Csi 2264: Characterizing Young Stars In Ngc 2264 With Short-Duration, Periodic Flux Dips In Their Light Curves, John Stauffer, Ann Marie Cody, Pauline Mcginnis, Luisa Rebull, Lynne A. Hillenbrand, Neal. J. Turner, John Carpenter, Peter Plavchan, Sean Carey, Susan Terebey, Maria Morales-Calderon, Silvia H.P. Alencar, Jerome Bouvier, Laura Venuti, Lee Hartmann, Nuria Calvet, Giushi Micela, Ettore Flaccomio, Inseok Song, R. A. Gutermuth, David Barrado, Frederick J. Vrba, Kevin Covey, Debbie Padgett, William Herbst, Edward Gillen, Wladimir Lyra, Marcelo Medeiros Guimaraes, Herve Bouy, Fabio Favata

Robert A. Gutermuth

We identify nine young stellar objects (YSOs) in the NGC 2264 star-forming region with optical CoRoT light curves exhibiting short-duration, shallow periodic flux dips. All of these stars have infrared excesses that are consistent with their having inner disk walls near the Keplerian co-rotation radius. The repeating photometric dips have FWHMs generally less than 1 day, depths almost always less than 15%, and periods (3 < P < 11 days) consistent with dust near the Keplerian co-rotation period. The flux dips vary considerably in their depth from epoch to epoch, but usually persist for several weeks and, in two cases, were present in data collected in successive years. For several of these stars, we also measure the photospheric rotation period and find that the rotation and dip periods are the same, as predicted by standard "disk-locking" models. We attribute these flux dips to clumps of material in or near the inner disk wall, passing through our line of sight to the stellar photosphere. In some cases, these dips are also present in simultaneous Spitzer IRAC light curves at 3.6 and 4.5 microns. We characterize the properties of these dips, and compare the stars with light curves exhibiting this behavior to other classes of YSOs in NGC 2264. A number of physical mechanisms could locally increase the dust scale height near the inner disk wall, and we discuss several of those mechanisms; the most plausible mechanisms are either a disk warp due to interaction with the stellar magnetic field or dust entrained in funnel-flow accretion columns arising near the inner disk wall.

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A Spitzer View Of The Giant Molecular Cloud Mon Ob1/Ngc 2264, Valerie A. Rapson, Judith L. Pipher, R. A. Gutermuth, Megeatj S. Thomas, Thomas S. Allen, Phillip C. Myers, Lori E. Allen Oct 2014

A Spitzer View Of The Giant Molecular Cloud Mon Ob1/Ngc 2264, Valerie A. Rapson, Judith L. Pipher, R. A. Gutermuth, Megeatj S. Thomas, Thomas S. Allen, Phillip C. Myers, Lori E. Allen

Robert A. Gutermuth

We present Spitzer 3.6, 4.5, 5.8, 8.0, and 24 μm images of the Mon OB1 East giant molecular cloud, which contains the young star forming region NGC 2264, as well as more extended star formation. With Spitzer data and Two Micron All Sky Survey photometry, we identify and classify young stellar objects (YSOs) with dusty circumstellar disks and/or envelopes in Mon OB1 East by their infrared-excess emission and study their distribution with respect to cloud material. We find a correlation between the local surface density of YSOs and column density of molecular gas as traced by dust extinction that is …

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From Voids To Coma: The Prevalence Of Pre-Processing In The Local Universe, R. A. Gutermuth Jan 2014

From Voids To Coma: The Prevalence Of Pre-Processing In The Local Universe, R. A. Gutermuth

Robert A. Gutermuth

We examine the effects of pre-processing across the Coma Supercluster, including 3505 galaxies over ∼500 deg2, by quantifying the degree to which star-forming (SF) activity is quenched as a function of environment. We characterize environment using the complementary techniques of Voronoi Tessellation, to measure the density field, and the Minimal Spanning Tree, to define continuous structures, and so we measure SF activity as a function of local density and the type of environment (cluster, group, filament, and void), and quantify the degree to which environment contributes to quenching of SF activity. Our sample covers over two orders of magnitude in …

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An Anomalous Extinction Law In The Cep Ob3b Young Cluster: Evidence For Dust Processing During Gas Dispersal, Thomas S. Allen, Jakub J. Prchlik, Thomas S. Mageath, R. A. Gutermuth, Judith L. Pipher, Tim Naylor, R.D. Jeffries Jan 2014

An Anomalous Extinction Law In The Cep Ob3b Young Cluster: Evidence For Dust Processing During Gas Dispersal, Thomas S. Allen, Jakub J. Prchlik, Thomas S. Mageath, R. A. Gutermuth, Judith L. Pipher, Tim Naylor, R.D. Jeffries

Robert A. Gutermuth

We determine the extinction law through Cep OB3b, a young cluster of 3000 stars undergoing gas dispersal. The extinction is measured toward 76 background K giants identified with MMT/Hectospec spectra. Color excess ratios were determined toward each of the giants using V and R photometry from the literature, g, r, i, and z photometry from the Sloan Digital Sky Survey and J, H, and Ks photometry from the Two Micron All Sky Survey. These color excess ratios were then used to construct the extinction law through the dusty material associated with Cep OB3b. The extinction law through Cep OB3b is …

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The Extraordinary Far-Infrared Variation Of A Protostar: Herschel/Pacs Observations Of Lrll54361, Zoltan Balog, James Muzerolle, Kevin Flaherty, Ors H. Detre, Jeroen Bouwmann, Elise Furlan, R. A. Gutermuth, Attila Juhasz, John Bally Jan 2014

The Extraordinary Far-Infrared Variation Of A Protostar: Herschel/Pacs Observations Of Lrll54361, Zoltan Balog, James Muzerolle, Kevin Flaherty, Ors H. Detre, Jeroen Bouwmann, Elise Furlan, R. A. Gutermuth, Attila Juhasz, John Bally

Robert A. Gutermuth

We report Herschel/Photodetector Array Camera and Spectrometer (PACS) photometric observations at 70 μm and 160 μm of LRLL54361—a suspected binary protostar that exhibits periodic (P = 25.34 days) flux variations at shorter wavelengths (3.6 μm and 4.5 μm) thought to be due to pulsed accretion caused by binary motion. The PACS observations show unprecedented flux variation at these far-infrared wavelengths that are well correlated with the variations at shorter wavelengths. At 70 μm the object increases its flux by a factor of six while at 160 μm the change is about a factor of two, consistent with the wavelength dependence …

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Star Cluster Formation And Feedback, Mark R. Krumholz, Matthew R. Bate, Hector. G. Arce, James E. Dale, R. A. Gutermuth, Richard I. Klein, Zhi-Yun Li, Fumitaka Nakamura, Qizhou Zhang Jan 2014

Star Cluster Formation And Feedback, Mark R. Krumholz, Matthew R. Bate, Hector. G. Arce, James E. Dale, R. A. Gutermuth, Richard I. Klein, Zhi-Yun Li, Fumitaka Nakamura, Qizhou Zhang

Robert A. Gutermuth

No abstract provided.

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Csi 2264: Simultaneous Optical And Infrared Light Curves Of Young Disk-Bearing Stars In Ngc 2264 With Corot And Spitzer--Evidence For Multiple Origins Of Variability, Ann Marie Cody, John Stauffer, Annie Baglin, Giuseppina Micela, Luisa M. Rebull, Ettore Flaccomio, Maria Morales-Calderon, Suzanne Aigrain, Jerome Bouvier, Lynne A. Hillenbrand, R. A. Gutermuth, Inseok Song, Neal Turner, Silvia H.P. Alencar, Konstanze Zwintz, Peter Plavchan, John Carpenter, Krzysztof Findeisen, Sean Carey, Susan Terebey, Lee Hartman, Nuria Calvet, Paula Teixeira, Frederick J. Vrba, Scott Wolk, Kevin Covey, Katja Poppenhaeger, Hanz Moritz Gunther, Jan Forbrich, Barbara Whitney, Laura Affer, William Herbst, Joseph Hora, David Borrado, Jon Hotzman, Franck Marchis, Kenneth Wood, Marcelo Medeiros Guimares, Jorge Lillo Box, Ed Gillen, Amy Mcquillan, Catherine Espaillat, Lori Allen, Paola D'Alessio, Fabio Fatava Jan 2014

Csi 2264: Simultaneous Optical And Infrared Light Curves Of Young Disk-Bearing Stars In Ngc 2264 With Corot And Spitzer--Evidence For Multiple Origins Of Variability, Ann Marie Cody, John Stauffer, Annie Baglin, Giuseppina Micela, Luisa M. Rebull, Ettore Flaccomio, Maria Morales-Calderon, Suzanne Aigrain, Jerome Bouvier, Lynne A. Hillenbrand, R. A. Gutermuth, Inseok Song, Neal Turner, Silvia H.P. Alencar, Konstanze Zwintz, Peter Plavchan, John Carpenter, Krzysztof Findeisen, Sean Carey, Susan Terebey, Lee Hartman, Nuria Calvet, Paula Teixeira, Frederick J. Vrba, Scott Wolk, Kevin Covey, Katja Poppenhaeger, Hanz Moritz Gunther, Jan Forbrich, Barbara Whitney, Laura Affer, William Herbst, Joseph Hora, David Borrado, Jon Hotzman, Franck Marchis, Kenneth Wood, Marcelo Medeiros Guimares, Jorge Lillo Box, Ed Gillen, Amy Mcquillan, Catherine Espaillat, Lori Allen, Paola D'Alessio, Fabio Fatava

Robert A. Gutermuth

We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30 day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination of multi-wavelength, high-precision, high-cadence, and long-duration data opens a new window into the time domain behavior of young stellar objects. Here we provide an overview of the observations, focusing on results from Spitzer and CoRoT. The highlight of this work is detailed analysis of 162 classical T Tauri stars for which we can probe optical and mid-infrared flux variations to 1% amplitudes and sub-hour timescales. We present a morphological variability …

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The Spitzer Survey Of Interstellar Clouds In The Gould Belt. Vi. The Auriga-California Molecular Cloud Observed With Irac And Mips, Hannah Broekhoven-Fiene, Brenda C. Matthews, Paul M. Harvey, R. A. Gutermuth, Tracy L. Huard, Nicholas F.H. Tothill, David Nutter, Tyler L. Bourke, James Difrancesco, Jes K. Jorgensen, Lori E. Allen, Nicholas L. Chapman, Michael M. Dunham, Bruno Merin, Jennifer Miller, Susan Terebey, Dawn E. Peterson, Karl R. Stapelfeldt Jan 2014

The Spitzer Survey Of Interstellar Clouds In The Gould Belt. Vi. The Auriga-California Molecular Cloud Observed With Irac And Mips, Hannah Broekhoven-Fiene, Brenda C. Matthews, Paul M. Harvey, R. A. Gutermuth, Tracy L. Huard, Nicholas F.H. Tothill, David Nutter, Tyler L. Bourke, James Difrancesco, Jes K. Jorgensen, Lori E. Allen, Nicholas L. Chapman, Michael M. Dunham, Bruno Merin, Jennifer Miller, Susan Terebey, Dawn E. Peterson, Karl R. Stapelfeldt

Robert A. Gutermuth

We present observations of the Auriga-California Molecular Cloud (AMC) at 3.6, 4.5, 5.8, 8.0, 24, 70, and 160 μm observed with the IRAC and MIPS detectors as part of the Spitzer Gould Belt Legacy Survey. The total mapped areas are 2.5 deg2 with IRAC and 10.47 deg2 with MIPS. This giant molecular cloud is one of two in the nearby Gould Belt of star-forming regions, the other being the Orion A Molecular Cloud (OMC). We compare source counts, colors, and magnitudes in our observed region to a subset of the SWIRE data that was processed through our pipeline. Using color-magnitude …

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Young Stellar Object Variability (Ysovar): Long Timescale Variations In The Mid-Infrared, L. M. Rebull, A. M. Cody, K. R. Covey, H. M. Gunther, L. A. Hillenbrand, P. Plavchan, K. Poppenhaeger, J. R. Stauffer, S. J. Wolk, R. A. Gutermuth, M. Morales-Calderon, I. Song, D. Barrado, A. Bayo, D. James, J. L. Hora, F. J. Vrba, C. Alves De Oliveira, J. Bouvier, S. J. Carey, J. M. Carpenter, F. Favata, K. Flaherty, J. Forbrich, J. Hernandez, M. J. Mccaughrean, S. T. Megeath, G. Micela, H. A. Smith, S. Terebey, N. Turner, L. Allen, D. Ardila, H. Bouy, S. Guieu Jan 2014

Young Stellar Object Variability (Ysovar): Long Timescale Variations In The Mid-Infrared, L. M. Rebull, A. M. Cody, K. R. Covey, H. M. Gunther, L. A. Hillenbrand, P. Plavchan, K. Poppenhaeger, J. R. Stauffer, S. J. Wolk, R. A. Gutermuth, M. Morales-Calderon, I. Song, D. Barrado, A. Bayo, D. James, J. L. Hora, F. J. Vrba, C. Alves De Oliveira, J. Bouvier, S. J. Carey, J. M. Carpenter, F. Favata, K. Flaherty, J. Forbrich, J. Hernandez, M. J. Mccaughrean, S. T. Megeath, G. Micela, H. A. Smith, S. Terebey, N. Turner, L. Allen, D. Ardila, H. Bouy, S. Guieu

Robert A. Gutermuth

The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (3.6 and 4.5 μm) time series photometry of the Orion Nebula Cluster plus smaller footprints in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. We present the data collection and reduction for the Spitzer and ancillary data, and define the "standard sample" on which we calculate statistics, …

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Csi 2264: Characterizing Accretion-Burst Dominated Light Curves For Young Stars In Ngc 2264, John Stauffer, Ann Marie Cody, Anne Baglin, Silvia Alenzcar, Luisa Rebull, Lynne A. Hillenbrand, Laura Venzuti, Neal J. Turner, John Carpenter, Peter Plavchan, Krzysztof Findeisen, Sean Carey, Susan Terebey, Maria Morales-Calderon, Jerome Bouvier, Guishi Micela, Ettore Flaccomio, Inseok Song, R. A. Gutermuth, Lee Hartmann, Nuria Calvet, Barbara Whitney, David Barrado, Frederick J. Vrba, Kevin Covey, William Herbst, Gabor Furesz, Suzanne Aigrain, Fabio Favata Jan 2014

Csi 2264: Characterizing Accretion-Burst Dominated Light Curves For Young Stars In Ngc 2264, John Stauffer, Ann Marie Cody, Anne Baglin, Silvia Alenzcar, Luisa Rebull, Lynne A. Hillenbrand, Laura Venzuti, Neal J. Turner, John Carpenter, Peter Plavchan, Krzysztof Findeisen, Sean Carey, Susan Terebey, Maria Morales-Calderon, Jerome Bouvier, Guishi Micela, Ettore Flaccomio, Inseok Song, R. A. Gutermuth, Lee Hartmann, Nuria Calvet, Barbara Whitney, David Barrado, Frederick J. Vrba, Kevin Covey, William Herbst, Gabor Furesz, Suzanne Aigrain, Fabio Favata

Robert A. Gutermuth

Based on more than four weeks of continuous high cadence photometric monitoring of several hundred members of the young cluster NGC 2264 with two space telescopes, NASA’s Spitzer and the CNES CoRoT (Convection, Rotation, and planetary Transits), we provide high quality, multi-wavelength light curves for young stellar objects (YSOs) whose optical variability is dominated by short duration flux bursts, which we infer are due to enhanced mass accretion rates. These light curves show many brief – several hour to one day – brightenings at optical and near-infrared (IR) wavelengths with amplitudes generally in the range 5-50% of the quiescent value. …

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The Dependence Of Protostellar Lumosity On Environment In The Cygnus-X Star-Forming Complex, E. Kryukova, S.T. Megeath, J.L. Hora, R. A. Gutermuth, S. Bontemps, K. Kraemer, M. Hennemann, N. Schneider, Howard. A. Smith, F. Motte Jan 2014

The Dependence Of Protostellar Lumosity On Environment In The Cygnus-X Star-Forming Complex, E. Kryukova, S.T. Megeath, J.L. Hora, R. A. Gutermuth, S. Bontemps, K. Kraemer, M. Hennemann, N. Schneider, Howard. A. Smith, F. Motte

Robert A. Gutermuth

The Cygnus-X star-forming complex is one of the most active regions of low- and high-mass star formation within 2 kpc of the Sun. Using mid-infrared photometry from the IRAC and MIPS Spitzer Cygnus-X Legacy Survey, we have identified over 1800 protostar candidates. We compare the protostellar luminosity functions of two regions within Cygnus-X: CygX-South and CygX-North. These two clouds show distinctly different morphologies suggestive of dissimilar star-forming environments. We find the luminosity functions of these two regions are statistically different. Furthermore, we compare the luminosity functions of protostars found in regions of high and low stellar density within Cygnus-X and …

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Ysovar: Mid-Ir Variability In The Star Forming Region Lynds 1688, H. M. Gunther, A. M. Cody, K. R. Covey, L. A. Hillenbrand, P. Plavchan, K. Poppenhaeger, L. M. Rebull, J. R. Stauffer, S. J. Wolk, L. Allen, A. Bayo, R. A. Gutermuth, J. L. Hora, H.Y.A. Meng, M. Morales-Calderon, J. R. Parks, Inseok Song Jan 2014

Ysovar: Mid-Ir Variability In The Star Forming Region Lynds 1688, H. M. Gunther, A. M. Cody, K. R. Covey, L. A. Hillenbrand, P. Plavchan, K. Poppenhaeger, L. M. Rebull, J. R. Stauffer, S. J. Wolk, L. Allen, A. Bayo, R. A. Gutermuth, J. L. Hora, H.Y.A. Meng, M. Morales-Calderon, J. R. Parks, Inseok Song

Robert A. Gutermuth

The emission from young stellar objects (YSOs) in the mid-infrared (mid-IR) is dominated by the inner rim of their circumstellar disks. We present IR data from the Young Stellar Object VARiability (YSOVAR) survey of ~800 objects in the direction of the Lynds 1688 (L1688) star-forming region over four visibility windows spanning 1.6 yr using the Spitzer Space Telescope in its warm mission phase. Among all light curves, 57 sources are cluster members identified based on their spectral energy distribution and X-ray emission. Almost all cluster members show significant variability. The amplitude of the variability is larger in more embedded YSOs. …

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Connecting X-Ray And Infrared Variability Among Young Stellar Objects: Ruling Out Potential Sources Of Disk Fluctuations, K.M. Flaherty, J. Muzerolle, S.J. Wolk, G. Rieke, R. A. Gutermuth, Z. Balog, W. Herbst, S.T. Mageath, E. Furlan Jan 2014

Connecting X-Ray And Infrared Variability Among Young Stellar Objects: Ruling Out Potential Sources Of Disk Fluctuations, K.M. Flaherty, J. Muzerolle, S.J. Wolk, G. Rieke, R. A. Gutermuth, Z. Balog, W. Herbst, S.T. Mageath, E. Furlan

Robert A. Gutermuth

Variability in the infrared emission from disks around pre-main-sequence stars over the course of days to weeks appears to be common, but the physical cause of the changes in disk structure are not constrained. Here we present coordinated monitoring of one young cluster with the Spitzer and Chandra space telescopes aimed at studying the physical source of the variability. In fall 2011 we obtained 10 epochs of Chandra ACIS photometry over a period of 30 days with a roughly 3 day cadence contemporaneous with 20 epochs of Spitzer [3.6], [4.5] photometry over 40 days with a roughly 2 day cadence …

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An X-Rays Survey Of The Young Stellar Population Of The Lynds 1641 And Iota Orionis Regions, I. Pillitteri, S.J. Wolk, S.T. Megeath, L. Allen, J. Bally, Marc Gagne, R. A. Gutermuth, L. Hartman, G. Micela, P. Myers, J.M. Oliveira, S. Sciortino, F. Walter, L. Redbull, J. Stauffer Jan 2013

An X-Rays Survey Of The Young Stellar Population Of The Lynds 1641 And Iota Orionis Regions, I. Pillitteri, S.J. Wolk, S.T. Megeath, L. Allen, J. Bally, Marc Gagne, R. A. Gutermuth, L. Hartman, G. Micela, P. Myers, J.M. Oliveira, S. Sciortino, F. Walter, L. Redbull, J. Stauffer

Robert A. Gutermuth

We present an XMM-Newton survey of the part of the Orion A cloud south of the Orion Nebula. This survey includes the Lynds 1641 (L1641) dark cloud, a region of the Orion A cloud with very few massive stars and hence a relatively low ambient UV flux, and the region around the O9 III star ι Orionis. In addition to proprietary data, we used archival XMM data of the Orion Nebula Cluster (ONC) to extend our analysis to a major fraction of the Orion A cloud. We have detected 1060 X-ray sources in L1641 and the ι Ori region. About …

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Abundant Cyanopolyynes As A Probe Of Infall In The Serpens South Cluster-Forming Region, R.K. Friesen, L. Medeiros, S. Schnee, T.L. Bourke, J. Di Francesco, R. A. Gutermuth, P.C. Myers Jan 2013

Abundant Cyanopolyynes As A Probe Of Infall In The Serpens South Cluster-Forming Region, R.K. Friesen, L. Medeiros, S. Schnee, T.L. Bourke, J. Di Francesco, R. A. Gutermuth, P.C. Myers

Robert A. Gutermuth

No abstract provided.

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Co Abundance Variations In The Orion Molecular Cloud, F. Ripple, M.H. Heyer, R. A. Gutermuth, R.L. Snell, C.M. Brunt Jan 2013

Co Abundance Variations In The Orion Molecular Cloud, F. Ripple, M.H. Heyer, R. A. Gutermuth, R.L. Snell, C.M. Brunt

Robert A. Gutermuth

Infrared stellar photometry from the Two Micron All-Sky Survey (2MASS) and spectral line imaging observations of 12CO and 13CO J = 1–0 line emission from the Five College Radio Astronomy Observatory (FCRAO) 14-m telescope are analysed to assess the variation of the CO abundance with physical conditions throughout the Orion A and Orion B molecular clouds. Three distinct Av regimes are identified in which the ratio between the 13CO column density and visual extinction changes corresponding to the photon-dominated envelope, the strongly self-shielded interior, and the cold, dense volumes of the clouds. Within the strongly self-shielded interior of the Orion …

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Filamentary Accretion Flows In The Embedded Serpens South Protocluster, Helen Kirk, Philip C. Myers, Tyler L. Bourke, R. A. Gutermuth, Abigail Hedden, Grant W. Wilson Jan 2013

Filamentary Accretion Flows In The Embedded Serpens South Protocluster, Helen Kirk, Philip C. Myers, Tyler L. Bourke, R. A. Gutermuth, Abigail Hedden, Grant W. Wilson

Robert A. Gutermuth

Filamentary structures are ubiquitous from large-scale molecular clouds (a few parsecs) to small-scale circumstellar envelopes around Class 0 sources (~1000 AU to ~0.1 pc). In particular, recent observations with the Herschel Space Observatory emphasize the importance of large-scale filaments (a few parsecs) and star formation. The small-scale flattened envelopes around Class 0 sources are reminiscent of the large-scale filaments. We propose an observationally derived scenario for filamentary star formation that describes the evolution of filaments as part of the process for formation of cores and circumstellar envelopes. If such a scenario is correct, small-scale filamentary structures (0.1 pc in length) …

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The Protoplanetary Disks In The Nearby Massive Star Forming Region Cygnus Ob2, M.G. Guarcello, J.J. Drake, N. J. Wright, J. E. Drew, R. A. Gutermuth, J. L. Hora, T. Naylor, T. Aldroft, A. Fruscione, D. Garcia-Alvarez, V. L. Kashyap, R. King Jan 2013

The Protoplanetary Disks In The Nearby Massive Star Forming Region Cygnus Ob2, M.G. Guarcello, J.J. Drake, N. J. Wright, J. E. Drew, R. A. Gutermuth, J. L. Hora, T. Naylor, T. Aldroft, A. Fruscione, D. Garcia-Alvarez, V. L. Kashyap, R. King

Robert A. Gutermuth

The formation of stars in massive clusters is one of the main modes of the star formation process. However, the study of massive star-forming regions is hampered by their typically large distances to the Sun. One exception to this is the massive star-forming region Cygnus OB2 in the Cygnus X region, at the distance of ~1400 pc. Cygnus OB2 hosts very rich populations of massive and low-mass stars, being the best target in our Galaxy to study the formation of stars, circumstellar disks, and planets in the presence of massive stars. In this paper, we combine a wide and deep …

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