Molecules in galaxies. V - CO observations of flocculent and grand-design spirals
1987; IOP Publishing; Volume: 322; Linguagem: Inglês
10.1086/165703
ISSN1538-4357
AutoresA. A. Stark, Bruce G. Elmegreen, D. Chance,
Tópico(s)Atomic and Molecular Physics
Resumoview Abstract Citations (57) References (49) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Molecules in Galaxies. V. CO Observations of Flocculent and Grand-Design Spirals Stark, Antony A. ; Elmegreen, Bruce G. ; Chance, Don Abstract New carbon monoxide (1-0) observations of 29 spiral galaxies are presented and combined with previously existing data for 74 galaxies in order to study the dependence of the average CO surface brightness on the spiral-arm class. The total sample shows no significant correlation between the CO surface brightness and the presence or absence of grand-design spiral structure. The observations imply that most stellar density waves do not significantly influence the average surface brightness of CO. This suggests that, if density waves trigger molecular cloud formation, then they either inhibit the other mechanisms of cloud formation to keep the total formation rate constant or they increase the visible disk area of the Galaxy to keep the average surface density of molecules approximately constant. If density waves do not significantly trigger molecular cloud formation, then the giant CO complexes observed in density-wave spiral arms are temporary conglomerates of smaller molecular clouds that formed independently of the wave. Publication: The Astrophysical Journal Pub Date: November 1987 DOI: 10.1086/165703 Bibcode: 1987ApJ...322...64S Keywords: Carbon Monoxide; Flocculating; Galactic Structure; Interstellar Matter; Molecular Clouds; Spiral Galaxies; Astronomical Maps; Astronomical Spectroscopy; Brightness Distribution; Density Wave Model; Hubble Constant; Infrared Spectra; Astrophysics; GALAXIES: STRUCTURE; INTERSTELLAR: MOLECULES full text sources ADS | data products NED (102) SIMBAD (28) Related Materials (5) Part 1: 1986ApJ...305..823R Part 2: 1986AJ.....91..517R Part 3: 1986ApJ...310..660S Part 4: 1987AJ.....94...54K Part 6: 1988ApJ...332..432P
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