Observations of local interstellar CO toward four compact extragalactic radio sources
Journal Article
·
· Astronomical Journal; (United States)
- Boston University, MA (USA) Haystack Observatory, Westford, MA (USA)
The interstellar J = 1 to 0 emission line of CO-12 toward the compact extragalactic continuum sources NRAO 140, NRAO 150, 3C 111, and BL Lacertae, was observed. Emission lines are detected toward all four sources at higher spatial resolution than was the case for observations reported previously. Compact sources toward which CO is detected are excellent candidates for CO emission-absorption observations using a combination of single antennas (emission) and millimeter-wave interferometers (absorption). Such observations would provide important insights into the radiative transfer of the CO lines as well as the physical conditions inside molecular clouds. The observations reported here, combined with published H I observations, yield values for the total column density in atomic and molecular gas along the lines of sight to the observed sources. This is important for the interpretation of X-ray spectra of these objects, since the intervening gas causes photoelectric absorption at low X-ray energies. 27 refs.
- OSTI ID:
- 5588107
- Journal Information:
- Astronomical Journal; (United States), Journal Name: Astronomical Journal; (United States) Vol. 101; ISSN 0004-6256; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC GASES
COSMIC RADIO SOURCES
DISTRIBUTION
EMISSION SPECTRA
FLUIDS
GASES
H1 REGIONS
INTERSTELLAR SPACE
MASS DISTRIBUTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
SPACE
SPATIAL DISTRIBUTION
SPECTRA
X-RAY SPECTRA
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC GASES
COSMIC RADIO SOURCES
DISTRIBUTION
EMISSION SPECTRA
FLUIDS
GASES
H1 REGIONS
INTERSTELLAR SPACE
MASS DISTRIBUTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
SPACE
SPATIAL DISTRIBUTION
SPECTRA
X-RAY SPECTRA