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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
The Five College Radio Astronomy Observatory Co Mapping Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Mh Heyer, C Brunt, Pf Goldsmith, Ronald L. Snell, D Li
The Five College Radio Astronomy Observatory Co Mapping Survey Of The Taurus Molecular Cloud, Gopal Narayanan, Mh Heyer, C Brunt, Pf Goldsmith, Ronald L. Snell, D Li
Astronomy Department Faculty Publication Series
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 …
Spitzer Spectral Line Mapping Of Supernova Remnants. I. Basic Data And Principal Component Analysis, Da Neufeld, Dj Hollenbach, Mj Kaufman, Ronald L. Snell, Gj Melnick, Ea Bergin, P Sonnentrucker
Spitzer Spectral Line Mapping Of Supernova Remnants. I. Basic Data And Principal Component Analysis, Da Neufeld, Dj Hollenbach, Mj Kaufman, Ronald L. Snell, Gj Melnick, Ea Bergin, P Sonnentrucker
Astronomy Department Faculty Publication Series
We report the results of spectroscopic mapping observations carried out toward small (1' × 1') regions within the supernova remnants W44, W28, IC 443, and 3C 391 using the Infrared Spectrograph (IRS) of the Spitzer Space Telescope. These observations, covering the 5.2-37 μm spectral region, have led to the detection of a total of 15 fine-structure transitions of Ne+, Ne++, Si+, P+, S, S++, Cl+, Fe+, and Fe++; the S(0)-S(7) pure rotational lines of molecular hydrogen; and the R(3) …
Spitzer Observations Of Hydrogen Deuteride, Da Neufeld, Jd Green, Dj Hollenbach, P Sonnentrucker, Gj Melnick, Ea Bergin, Ronald L. Snell, Wj Forrest, Dm Watson, Mj Kaufman
Spitzer Observations Of Hydrogen Deuteride, Da Neufeld, Jd Green, Dj Hollenbach, P Sonnentrucker, Gj Melnick, Ea Bergin, Ronald L. Snell, Wj Forrest, Dm Watson, Mj Kaufman
Astronomy Department Faculty Publication Series
No abstract provided.
Water Absorption From Line-Of-Sight Clouds Toward W49a, R Plume, Mj Kaufman, Da Neufeld, Ronald L. Snell, Dj Hollenbach, Pf Goldsmith, J Howe, Ea Bergin, Gj Melnick, F Bensch
Water Absorption From Line-Of-Sight Clouds Toward W49a, R Plume, Mj Kaufman, Da Neufeld, Ronald L. Snell, Dj Hollenbach, Pf Goldsmith, J Howe, Ea Bergin, Gj Melnick, F Bensch
Astronomy Department Faculty Publication Series
We have observed six clouds along the line of sight toward W49A using the Submillimeter Wave Astronomy Satellite and several ground-based observatories. The ortho-H2O 110 → 101 and OH (1665 and 1667 MHz) transitions are observed in absorption, whereas the low-J CO, 13CO, and C18O lines, as well as the [C I] 3P1-3P0 transition, are seen in emission. The emission lines allow us to determine the gas density (n ~ 1500-3000 cm-3) and CO column densities [N(CO) ~ 7.9 …
Star Formation In Bright-Rimmed Clouds. I. Millimeter And Submillimeter Molecular Line Surveys, Ch De Vries, Gopal Narayanan, Ronald L. Snell
Star Formation In Bright-Rimmed Clouds. I. Millimeter And Submillimeter Molecular Line Surveys, Ch De Vries, Gopal Narayanan, Ronald L. Snell
Astronomy Department Faculty Publication Series
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), H …
The Equilibrium State Of Molecular Regions In The Outer Galaxy, Mh Heyer, Jm Carpenter, Ronald L. Snell
The Equilibrium State Of Molecular Regions In The Outer Galaxy, Mh Heyer, Jm Carpenter, Ronald L. Snell
Astronomy Department Faculty Publication Series
A summary of global properties and an evaluation of the equilibrium state of molecular regions in the outer Galaxy are presented from the decomposition of the FCRAO Outer Galaxy Survey and targeted 12CO and 13CO observations of four giant molecular cloud complexes. The ensemble of identified objects includes both small, isolated clouds and clumps within larger cloud complexes. The 12CO luminosity function and size distribution of a subsample of objects with well-defined distances are determined such that ΔN/ΔLCO = L and ΔN/Δre = r. 12CO velocity dispersions …
Submillimeter Wave Astronomy Satellite Observations Of Extended Water Emission In Orion, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
Submillimeter Wave Astronomy Satellite Observations Of Extended Water Emission In Orion, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
Astronomy Department Faculty Publication Series
We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 110 → 101 transition of ortho-H2O at 557 GHz in the Orion molecular cloud. H2O emission was detected in Orion over an angular extent of about 20', or nearly 3 pc. The water emission is relatively weak, with line widths (3-6 km s-1) and VLSR velocities (9-11 km s-1) consistent with an origin in the cold gas of the molecular ridge. We find that the ortho-H2O abundance relative to H2 in the extended gas …
Water Abundance In Molecular Cloud Cores, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
Water Abundance In Molecular Cloud Cores, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
Astronomy Department Faculty Publication Series
We present Submillimeter Wave Astronomy Satellite (SWAS) observations of the 110 → 101 transition of ortho-H2O at 557 GHz toward 12 molecular cloud cores. The water emission was detected in NGC 7538, ρ Oph A, NGC 2024, CRL 2591, W3, W3OH, Mon R2, and W33 and was not detected in TMC-1, L134N, and B335. We also present a small map of the H2O emission in S140. Observations of the H218O line were obtained toward S140 and NGC 7538, but no emission was detected. The abundance of ortho-H2O …
The Distribution Of Water Emission In M17sw, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
The Distribution Of Water Emission In M17sw, Ronald L. Snell, Je Howe, Mln Ashby, Ea Bergin, G Chin, Nr Erickson, Pf Goldsmith, M Harwit, Sc Kleiner, Dg Koch, Da Neufeld, Bm Patten, R Plume, R Schieder, Jr Stauffer, V Tolls, Z Wang, G Winnewisser, Yf Zhang, Gj Melnick
Astronomy Department Faculty Publication Series
We present a 17-point map of the M17SW cloud core in the 110 → 101 transition of ortho-H2O at 557 GHz obtained with Submillimeter Wave Astronomy Satellite. Water emission was detected in 11 of the 17 observed positions. The line widths of the H2O emission vary between 4 and 9 km s-1 and are similar to other emission lines that arise in the M17SW core. A direct comparison is made between the spatial extent of the H2O emission and the 13CO J = 5 → 4 emission; the good …