Warm neutral halos around molecular clouds. III - Interpretation of H I and CO J = 1-0 data

Abstract

view Abstract Citations (44) References (54) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Warm Neutral Halos around Molecular Clouds. III. Interpretation of H i and CO J = 1--0 Data Andersson, B. -G. ; Wannier, Peter G. ; Morris, Mark Abstract The physical characteristics of the transition region separating the molecular and the atomic medium in interstellar clouds are studied using H I 21-cm and CO J = 1-0 data. Strong evidence is found for general heating of the surface layers of molecular clouds and for the existence of large heated neutral atomic halos around the molecular clouds. The heating of the molecular cloud surface is manifested through the general existence of limb brightening in the CO emission, with a characteristic depth of 1.7 pc, dependent on the Galactic latitude. The heated H I halos have a characteristic depth of 4.7 pc and a maximal extent of about 10 pc. Publication: The Astrophysical Journal Pub Date: January 1991 DOI: 10.1086/169581 Bibcode: 1991ApJ...366..464A Keywords: Halos; Interstellar Gas; Molecular Clouds; Radio Sources (Astronomy); Carbon Monoxide; Hydrogen Clouds; Limb Brightening; Astrophysics; INTERSTELLAR: MOLECULES; RADIO SOURCES: 21 CM RADIATION full text sources ADS | data products SIMBAD (59) Related Materials (5) Part 1: 1983ApJ...268..727W Part 2: 1991ApJS...75..987W Part 4: 1992A&A...260..355A Part 5: 1993ApJ...407..163W Part 6: 1993ApJ...402..585A