Comparison of the far-infrared and carbon monoxide emission in Heiles' Cloud 2 and B18

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167145· OSTI ID:5398010

Snell, R L; Schloerb, F P; Heyer, M H ^[1]

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1. Massachusetts Univ., Amherst (USA)

A comparison is made of the far-IR emission detected by IRAS at 60 and 100 microns and the emission from C(-13)O in B18 and Heiles' Cloud 2. The results show that both these clouds have extended emission at the studied wavelengths and that this emission is correlated with the integrated intensity of (C-13)O emission. The dust temperature and optical depth, the gas column density, the mass of gas and dust, and the far-IR luminosity are derived and presented. The analysis shows that the dust optical depth is much better correlated with the gas column density than with the far-IR intensity. The dust temperature is found to be anticorrelated with the gas column density, suggesting that these clouds are externally heated by the interstellar radiation field. The far-IR luminosity-to-mass ratios for the clouds are substantially less than the average for the inner Galaxy. 24 references.

• OSTI ID: 5398010
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 337; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COSMIC DUST
COSMIC GASES
DENSITY
DUSTS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
FAR INFRARED RADIATION
FLUIDS
GASES
HEATING
INFRARED RADIATION
INTERSTELLAR SPACE
LUMINOSITY
MASS
MOLECULES
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SATELLITES
SPACE
SPECTRA
SURVEYS
TEMPERATURE MEASUREMENT