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- ISM: Clouds (5)
- Stars: formation (5)
- ISM: Molecules (3)
- Galaxies: ISM (2)
- Galaxies: evolution (2)
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- ISM: Individual alphanumeric SMM4 (2)
- ISM: Jets and Outflows (2)
- ISM: clouds (2)
- ISM: general (2)
- ISM: molecules (2)
- Stars: Circumstellar matter (2)
- Surveys (2)
- Galaxies: observations (1)
- Galaxies: spiral (1)
- Galaxies: star formation (1)
- Galaxies: starburst (1)
- Heterodyne Imaging arrays (1)
- High-redshift (1)
- ISM (1)
- ISM: Abundances (1)
- ISM: Atoms (1)
- ISM: Herbig-Haro Objects (1)
- ISM: Individual (Taurus) (1)
- ISM: Individual Objects (Taurus) (1)
- ISM: Kinematics and Dynamics (1)
- ISM: Kinematics and dynamics (1)
- ISM: Structure (1)
- ISM: molecutes (1)
- Individual (carbon monoxide) (1)
- Instrumentation: spectrographs (1)
Articles 1 - 16 of 16
Full-Text Articles in Entire DC Network
The Red Radio Ring: A Gravitationally Lensed Hyperluminous Infrared Radio Galaxy At Z=2.553 Discovered Through Citizen Science, J. E. Geach, A. More, A. Verma, P.J. Marshall, N. Jackson, P. E. Belles, R. Beswick, E. Baeten, M. Chavez, C. Cornen, B. E. Cox, T. Erben, N. J. Erickson, S. Garrington, P. A. Harrison, K. Harrington, D. H. Hughes, R. J. Ivison, C. Jordan, Y. T. Lin, A. Leauthaud, C. Lintott, S. Lynn, A. Kapadia, J. P. Kneib, C. Macmillan, M. Makler, G. Miller, A. Montana, R. Mujica, T. Muxlow, Gopal Narayanan, D. O Briain, T. O'Brien, M. Oguri, E. Paget, M. Parrish, N.P. Ross, E. Rozo, E. Rusu, E. S. Rykoff, D. Sanchez-Arguelles, R. Simpson, C. Snyder, F. P. Schloerb, M. Tecza, L. Van Waerbeke, J. Wilcox, M. Viero, G. W. Wilson, M. S. Yun, M. Zeballos
The Red Radio Ring: A Gravitationally Lensed Hyperluminous Infrared Radio Galaxy At Z=2.553 Discovered Through Citizen Science, J. E. Geach, A. More, A. Verma, P.J. Marshall, N. Jackson, P. E. Belles, R. Beswick, E. Baeten, M. Chavez, C. Cornen, B. E. Cox, T. Erben, N. J. Erickson, S. Garrington, P. A. Harrison, K. Harrington, D. H. Hughes, R. J. Ivison, C. Jordan, Y. T. Lin, A. Leauthaud, C. Lintott, S. Lynn, A. Kapadia, J. P. Kneib, C. Macmillan, M. Makler, G. Miller, A. Montana, R. Mujica, T. Muxlow, Gopal Narayanan, D. O Briain, T. O'Brien, M. Oguri, E. Paget, M. Parrish, N.P. Ross, E. Rozo, E. Rusu, E. S. Rykoff, D. Sanchez-Arguelles, R. Simpson, C. Snyder, F. P. Schloerb, M. Tecza, L. Van Waerbeke, J. Wilcox, M. Viero, G. W. Wilson, M. S. Yun, M. Zeballos
Gopal Narayanan
We report the discovery of a gravitationally lensed hyperluminous infrared galaxy (L_IR~10^13 L_sun) with strong radio emission (L_1.4GHz~10^25 W/Hz) at z=2.553. The source was identified in the citizen science project SpaceWarps through the visual inspection of tens of thousands of iJKs colour composite images of Luminous Red Galaxies (LRGs), groups and clusters of galaxies and quasars. Appearing as a partial Einstein ring (r_e~3") around an LRG at z=0.2, the galaxy is extremely bright in the sub-millimetre for a cosmological source, with the thermal dust emission approaching 1 Jy at peak. The redshift of the lensed galaxy is determined through the …
Early Science With The Large Millimeter Telescope: Exploring The Effect Of Agn Activity On The Relationships Between Molecular Gas Dust And Star Formation, Allison Kirkpatrick, Alexandra Pope, Itziar Aretxaca, Lee Armus, Daniela Calzetti, George Helou, Alfredo Montana, Gopal Narayanan, F. Peter Schloerb, Young Shi, Olga Vega, Min Yun
Early Science With The Large Millimeter Telescope: Exploring The Effect Of Agn Activity On The Relationships Between Molecular Gas Dust And Star Formation, Allison Kirkpatrick, Alexandra Pope, Itziar Aretxaca, Lee Armus, Daniela Calzetti, George Helou, Alfredo Montana, Gopal Narayanan, F. Peter Schloerb, Young Shi, Olga Vega, Min Yun
Gopal Narayanan
The molecular gas, H2, that fuels star formation in galaxies is difficult to observe directly. As such, the ratio of LIR to is an observational estimate of the star formation rate compared with the amount of molecular gas available to form stars, which is related to the star formation efficiency and the inverse of the gas consumption timescale. We test what effect an IR luminous active galactic nucleus (AGN) has on the ratio in a sample of 24 intermediate redshift galaxies from the 5 mJy Unbiased Spitzer Extragalactic Survey (5MUSES). We obtain new CO(1–0) observations with the Redshift Search Receiver …
Molecular Gas Content Of Hi Monsters And Implications To Cold Gas Content Evolution In Galaxies, Cheoljong Lee, Aeree Chung, Min S. Yun, Ryan Cybulski, Gopal Narayanan, N. Erickson
Molecular Gas Content Of Hi Monsters And Implications To Cold Gas Content Evolution In Galaxies, Cheoljong Lee, Aeree Chung, Min S. Yun, Ryan Cybulski, Gopal Narayanan, N. Erickson
Gopal Narayanan
No abstract provided.
The Lmt Galaxies 3 Mm Spectroscopic Survey: First Results, D. Rosa Gonzalez, P. Schloerb, O. Vega, L. Hunt, Gopal Narayanan, D. Calzetti, M. Yun, E. Terlevich, R. J. Terlevich, Y. D. Mayya, M. Chavez, A. Montana, A. M. Perez Garcia
The Lmt Galaxies 3 Mm Spectroscopic Survey: First Results, D. Rosa Gonzalez, P. Schloerb, O. Vega, L. Hunt, Gopal Narayanan, D. Calzetti, M. Yun, E. Terlevich, R. J. Terlevich, Y. D. Mayya, M. Chavez, A. Montana, A. M. Perez Garcia
Gopal Narayanan
The molecular phase of the interstellar medium (ISM) in galaxies offers fundamental insight for understanding star-formation processes and how stellar feedback affects the nuclear activity of certain galaxies. We present here Large Millimeter Telescope spectra obtained with the Redshift Search Receiver, a spectrograph that covers simultaneously the 3 mm band from 74 to 111 GHz with a spectral resolution of around 100 km/s. Our selected galaxies, have been detected previously in HCN, and have different degrees of nuclear activity — one normal galaxy (NGC 6946), the starburst prototype (M82) and two %ultraluminous infrared galaxies (ULIRGs, IRAS 17208-0014 and Mrk 231). …
Molecular Outlfows Identified In The Fcrao Co Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Ronald Snell, Ashley Bemis
Molecular Outlfows Identified In The Fcrao Co Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Ronald Snell, Ashley Bemis
Gopal Narayanan
Jets and outflows are an integral part of the star formation process. While there are many detailed studies of molecular outflows towards individual star-forming sites, few studies have surveyed an entire star-forming molecular cloud for this phenomenon. The 100-deg2 Five College Radio Astronomy Observatory CO survey of the Taurus Molecular Cloud provides an excellent opportunity to undertake an unbiased survey of a large, nearby, molecular cloud complex for molecular outflow activity. Our study provides information on the extent, energetics and frequency of outflows in this region, which are then used to assess the impact of outflows on the parent molecular …
The Redshift Search Receiver 3 Mm Wavelength Spectra Of 10 Galaxies, Ronald L. Snell, Gopal Narayanan, Min S. Yun, Mark Heyer, Aeree Chung, William M. Irvine, Neal R. Erickson, Guilin Liu
The Redshift Search Receiver 3 Mm Wavelength Spectra Of 10 Galaxies, Ronald L. Snell, Gopal Narayanan, Min S. Yun, Mark Heyer, Aeree Chung, William M. Irvine, Neal R. Erickson, Guilin Liu
Gopal Narayanan
The 3 mm wavelength spectra of 10 galaxies have been obtained at the Five College Radio Astronomy Observatory using a new, very broadband receiver and spectrometer, called the Redshift Search Receiver (RSR). The RSR has an instantaneous bandwidth of 37 GHz covering frequencies from 74 to 111 GHz and has a spectral resolution of 31 MHz (~100 km s–1). During tests of the RSR on the FCRAO 14 m telescope the complete 3 mm spectra of the central regions of NGC 253, Maffei 2, NGC1068, IC 342, M82, NGC 3079, NGC 3690, NGC 4258, Arp 220, and NGC 6240 were …
The Redshift Search Receiver Observations Of 12co J = 1 → 0 In 29 Ultraluminous Infrared Galaxies, Aeree Chung, Gopal Narayanan, Min S. Yun, Mark Heyer, Neal R. Erickson
The Redshift Search Receiver Observations Of 12co J = 1 → 0 In 29 Ultraluminous Infrared Galaxies, Aeree Chung, Gopal Narayanan, Min S. Yun, Mark Heyer, Neal R. Erickson
Gopal Narayanan
We present 12CO J = 1 → 0 observations of ultraluminous infrared galaxies (ULIRGs) obtained using the Redshift Search Receiver (RSR) on the 14 m telescope of the Five College Radio Astronomy Observatory. The RSR is a novel, dual-beam, dual-polarization receiver equipped with an ultra-wideband spectrometer backend that is being built as a facility receiver for the Large Millimeter Telescope. Our sample consists of 29 ULIRGs in the redshift range of 0.04–0.11, including 10 objects with no prior 12CO measurements. We have detected 27 systems (a detection rate of 93%), including 9 ULIRGs that are detected in CO for the …
Large-Scale Structure Of The Molecular Gas In Taurus Revealed By High Linear Dynamic Range Spectral Line Mapping, Paul F. Goldsmith, Mark Heyer, Gopal Narayanan, Ronald Snell, Di Li, Chris Brunt
Large-Scale Structure Of The Molecular Gas In Taurus Revealed By High Linear Dynamic Range Spectral Line Mapping, Paul F. Goldsmith, Mark Heyer, Gopal Narayanan, Ronald Snell, Di Li, Chris Brunt
Gopal Narayanan
We report the results of a 100 deg2 survey of the Taurus molecular cloud region in 12CO and 13CO J = 1→ 0. The image of the cloud in each velocity channel includes simeq3 × 106 Nyquist-sampled pixels on a 20'' grid. The high sensitivity and large spatial dynamic range of the maps reveal a very complex, highly structured cloud morphology, including filaments, cavities, and rings. The axes of the striations seen in the 12CO emission from relatively diffuse gas are aligned with the direction of the magnetic field. We have developed a statistical method for analyzing the pixels in …
The Five College Radio Astronomy Observatory Co Mapping Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Mark H. Heyer, Christopher Brunt, Paul F. Goldsmith, Ronald Snell, Di Li
The Five College Radio Astronomy Observatory Co Mapping Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Mark H. Heyer, Christopher Brunt, Paul F. Goldsmith, Ronald Snell, Di Li
Gopal Narayanan
The FCRAO Survey of the Taurus molecular cloud observed the 12CO and 13CO J = 1–0 emission from 98 deg2 of this important, nearby, star-forming region. This set of data with 45'' resolution comprises the highest spatial dynamic range image of an individual molecular cloud constructed to date and provides valuable insights to the molecular gas distribution, kinematics, and the star formation process. In this contribution, we describe the observations, calibration, data processing, and characteristics of the noise and line emission of the survey. The angular distribution of 12CO and 13CO emission over 1 km s−1 velocity intervals and the …
Spectra Of Nearby Galaxies Measured With A New Very Broadband Receiver, Gopal Narayanan, Ronald L. Snell, Neal R. Erickson, Aeree Chung, Mark H. Heyer, Min Yun, William M. Irvine
Spectra Of Nearby Galaxies Measured With A New Very Broadband Receiver, Gopal Narayanan, Ronald L. Snell, Neal R. Erickson, Aeree Chung, Mark H. Heyer, Min Yun, William M. Irvine
Gopal Narayanan
Three-millimeter-wavelength spectra of a number of nearby galaxies have been obtained at the Five College Radio Astronomy Observatory (FCRAO) using a new, very broadband receiver. This instrument, which we call the Redshift Search Receiver, has an instantaneous bandwidth of 36 GHz and operates from 74 to 110.5 GHz. The receiver has been built at UMass/FCRAO to be part of the initial instrumentation for the Large Millimeter Telescope (LMT) and is intended primarily for determination of the redshift of distant, dust-obscured galaxies. It is being tested on the FCRAO 14 m by measuring the 3 mm spectra of a number of …
Discovery Of A Molecular Outflow In The Haro 6-10 Star-Forming Region, Irena Stojimirovic, Gopal Narayanan, Ronald L. Snell
Discovery Of A Molecular Outflow In The Haro 6-10 Star-Forming Region, Irena Stojimirovic, Gopal Narayanan, Ronald L. Snell
Gopal Narayanan
No abstract provided.
Supercam, As 64-Pixel Heterodyne Imaging Array For The 870 Micron Atmospheric Window, Christopher Groppi, Christopher Walker, Craig Kulesa, Patrick Putz, Dathon Golish, Paul Gensheimer, Abigail Hedden, Shane Bussmann, Sander Weinreb, Thomas Kuiper, Jacob Kooi, Glenn Jones, Joseph Bardin, Hamdi Mani, Arthur Lichtenberger, Gopal Narayanan
Supercam, As 64-Pixel Heterodyne Imaging Array For The 870 Micron Atmospheric Window, Christopher Groppi, Christopher Walker, Craig Kulesa, Patrick Putz, Dathon Golish, Paul Gensheimer, Abigail Hedden, Shane Bussmann, Sander Weinreb, Thomas Kuiper, Jacob Kooi, Glenn Jones, Joseph Bardin, Hamdi Mani, Arthur Lichtenberger, Gopal Narayanan
Gopal Narayanan
We report on the development of SuperCam , a 64 pixel, superheterodyne camera designed for operation in the astrophysically important 870 μm atmospheric window. SuperCam will be used to answer fundamental questions about the physics and chemistry of molecular clouds in the Galaxy and their direct relation to star and planet formation. The advent of such a system will provide an order of magnitude increase in mapping speed over what is now available and revolutionize how observational astronomy is performed in this important wavelength regime. Unlike the situation with bolometric detectors, heterodyne receiver systems are coherent, retaining information about both …
Kinematics Of Protostellar Objects In The Ρ Ophiuchus A Region, Gopal Narayanan, Daniel W. Logan
Kinematics Of Protostellar Objects In The Ρ Ophiuchus A Region, Gopal Narayanan, Daniel W. Logan
Gopal Narayanan
We present the detection of infall, rotation, and outflow kinematic signatures toward both a protostellar source, VLA 1623, and what was initially thought to be a pre-protostellar core, SM 1N, in the ρ Ophiuchus A region. The kinematic signatures of early star formation were detected in the dense molecular gas surrounding the embedded sources using high signal-to-noise ratio millimeter and submillimeter data. Centroid velocity maps made with HCO+ J = 4 → 3 and J = 1 → 0 line emission exhibit the blue bulge signature of infall, which is predicted to be seen when infall motion dominates over rotational …
Entrainment Mechanisms For Outlfows In The L1551 Star-Forming Region, Irena Stijimirovic, Gopal Narayanan, Ronald L. Snell
Entrainment Mechanisms For Outlfows In The L1551 Star-Forming Region, Irena Stijimirovic, Gopal Narayanan, Ronald L. Snell
Gopal Narayanan
We present high sensitivity 12CO and 13CO J = 1 → 0 maps covering the full extent of the parsec-scale L1551 molecular outflow, including the redshifted east-west (EW) flow. We also present 12CO J = 3 → 2 data obtained over a good fraction of the L1551 outflow. We compare the molecular data to wide-field, narrowband optical emission in Hα. While there are multiple outflows in the L1551 cloud, the main outflow is oriented at 50° position angle and appears to be driven by an embedded source(s) in the central IRS 5 region. The J = 3 → 2 data …
Star Formation In Bright Rimmed Clouds. I. Millimeter And Submillimeter Molecular Line Surveys, Christopher H. De Vries, Gopal Narayanan, Ronald L. Snell
Star Formation In Bright Rimmed Clouds. I. Millimeter And Submillimeter Molecular Line Surveys, Christopher H. De Vries, Gopal Narayanan, Ronald L. Snell
Gopal Narayanan
We present the results of the first detailed millimeter and submillimeter molecular line survey of bright-rimmed clouds, observed at FCRAO in the CO (J = 1 ? 0), C18O (J = 1 ? 0), HCO+ (J = 1 ? 0), H13CO+ (J = 1 ? 0), and N2H+ (J = 1 ? 0) transitions, and at the Heinrich Hertz Telescope in the CO (J = 2 ? 1), HCO+ (J = 3 ? 2), HCO+ (J = 4 ? 3), H13CO+ (J = 3 ? 2), and H13CO+ (J = 4 ? 3) molecular line transitions. The source list is …
Detection Of Infall Signatures Towards Serpens Smm4, Gopal Narayanan, G. Moriarty-Schieven, C.K. Walker, H.M. Butner
Detection Of Infall Signatures Towards Serpens Smm4, Gopal Narayanan, G. Moriarty-Schieven, C.K. Walker, H.M. Butner
Gopal Narayanan
We present the detection of kinematic infall signatures toward the Class 0 protostellar system SMM4 in the Serpens cloud core. We have observed the dense molecular gas toward the embedded source using millimeter and submillimeter line transitions of density sensitive molecular tracers. High signal-to-noise ratio maps obtained in HCO+ J = 1 → 0, J = 3 → 2, and J = 4 → 3, and CS J = 2 → 1 show the blue-bulge infall signature. The blue-bulge infall signature can be observed in the centroid velocity maps of protostellar objects when infall dominates over rotation. The line profiles …