HCl absorption toward Sagittarius B2.

  title={HCl absorption toward Sagittarius B2.},
  author={J. Zmuidzinas and G. Blake and J. Carlstrom and J. Keene and D. Miller},
  journal={The Astrophysical journal},
  volume={447 2 Pt 2},
We have detected the 626 GHz J = 1 --> 0 transition of hydrogen chloride (H35Cl) in absorption against the dust continuum emission of the molecular cloud Sagittarius B2. The observed line shape is consistent with the blending of the three hyperfine components of this transition by the velocity profile of Sgr B2 observed in other species. The apparent optical depth of the line is tau approximately 1, and the minimum HCl column density is 1.6 x 10(14) cm-2. A detailed radiative transfer model was… Expand
We report the detection of hydrogen chloride, HCl, in diffuse molecular clouds on the line of sight toward the star-forming region W31C (G10.6-0.4). The J = 1-0 lines of the two stable HClExpand
Discovery of Interstellar Hydrogen Fluoride
We report the first detection of interstellar hydrogen fluoride. Using the Long Wavelength Spectrometer of the Infrared Space Observatory (ISO), we have detected the 121.6973 μm J=2-1 line of HF inExpand
The 35CI/37CI isotopic ratio in dense molecular clouds: HIFI obervations of hydrogen chloride towards W3 A*
We report on the detection with the HIFI instrument on board the Herschel satellite of the two hydrogen chloride isotopologues, H 35 Cl and H 37 Cl, towards the massive star-forming region W3 A. TheExpand
A Comprehensive Survey of Hydrogen Chloride in the Galaxy
We report new observations of the fundamental J = 1–0 transition of HCl (at 625.918 GHz) toward a sample of 27 galactic star-forming regions, molecular clouds, and evolved stars, carried out usingExpand
HIFI detection of hydrogen fluoride in the carbon star envelope IRC +10216
We report the detection of emission in the J = 1−0 rotational transition of hydrogen fluoride (HF), together with observations of the J = 1−0 to J = 3−2 rotational lines of H35Cl and H37Cl, towardsExpand
The line-of-sight distribution of water in the SgrB2 complex
We report the detection, with the Caltech Submillimeter Observatory ? , of the 894-GHz HDO(11;1 00;0) transition, observed in absorption against the background continuum emission of the SgrB2 cores MExpand
Search for Interstellar Water in the Translucent Molecular Cloud toward HD 154368
We report an upper limit of 9 × 1012 cm-2 on the column density of water in the translucent cloud along the line of sight toward HD 154368. This result is based on a search for the C-X band of waterExpand
The ISO LWS high-resolution spectral survey towards Sagittarius B2
A full spectral survey was carried out towards the Giant Molecular Cloud complex, Sagittarius B2 (Sgr B2), using the ISO Long Wavelength Spectrometer Fabry-Perot mode. This provided completeExpand
A Three-Position Spectral Line Survey of Sagittarius B2 between 218 and 263 GHZ. II. Data Analysis
We present an analysis of the data from our Swedish-ESO Submillimetre Telescope molecular line survey in the 1.3 mm band of the N, M, and NW positions in the Sgr B2 molecular cloud. The lineExpand
ISO ammonia line absorption reveals a layer of hot gas veiling Sgr B2
We report the rst results of the unbiased spectral high resolution survey obtained towards Sgr B2 with the Long Wavelength Spectrometer on board ISO. The survey detected more than one hundreds linesExpand


Chlorine in dense interstellar clouds : the abundance of HCl in OMC-1.
We report the first detection of a chlorine-bearing molecular species in the interstellar medium via emission from the J = 1 → 0 transition of HCl at 625.9 GHz toward OMC-1. The relative strengths,Expand
Modeling of the continuum and molecular line emission from the Sagittarius B2 molecular cloud
The continuum and molecular line emission from the Sagittarius B2 molecular cloud are modeled in order to determine the conditions in the core and the envelope of the cloud. The continuum modelsExpand
Molecular line survey of Sagittarius B2(M) from 330 to 355 GHz and comparison with Sagittarius B2(N)
We have surveyed molecular line emission from Sgr B2 over the range from 330 to 355 GHz at the position designated Sgr B2(M). This position is prominent in millimeter continuum maps of the region andExpand
High angular resolution submillimeter observations of Sagittarius B2
Continuum observations of the Sgr B2 molecular cloud have been carried out. The data offer the first detailed description of the submillimeter radiation from this complex source. The emission isExpand
A Molecular Line Survey of Sagittarius B2 and Orion--KL from 70 to 115 GHz. II. Analysis of the Data
Over 800 lines in OMC-1 and over 700 in Sgr B2 were observed in the NRAO 3-mm survey. Detailed LTE analysis of 33 species has been performed using numbers of transitions in the range 4-98.Expand
Millimeter continuum observations of a massive protostellar core in Sagittarius B2
The Hat Creek interferometer has been used to map 3.4 mm continuum emission from Sgr B2 with 4.5 x 2 arcsec resolution. The fluxes of two of the detected sources are substantially higher at 3.4 mmExpand
Excitation of interstellar hydrogen chloride
We have computed new rate coefficients for the collisional excitation of HCl by He, in the close-coupled formalism and using an interaction potential determined recently by Willey, Choong, & DeLucia.Expand
Millimeter continuum observations of galactic center giant molecular cloud cores
Results are presented of observations of 1.3- and 0.8-mm continuum emission toward the cores of three Galactic center molecular clouds with ongoing massive star formation, Sagittarius B2, C, and D,Expand
Millimeter-wavelength aperture synthesis observations of massive star-forming regions in Sagittarius B2
We have observed the 1.3 mm continuum and the HC 3 N J=25→24 emission toward two massive star-forming regions in the core of the Sgr B2 molecular cloud, Sgr B2(N) and (M), using the three-elementExpand
Observations of interstellar chlorine and phosphorus
Observations of interstellar Cl i and Cl ii and upper limits for HCl have been obtained toward 10 star with the Copernicus satellite. Since the cosmic abundance of chlorine is not well establishedExpand