Title: The largest molecular cloud complexes in the first galactic quadrant
Abstract:view Abstract Citations (412) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Largest Molecular Cloud Complexes in the First Galactic Quadrant Dame...view Abstract Citations (412) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Largest Molecular Cloud Complexes in the First Galactic Quadrant Dame, T. M. ; Elmegreen, B. G. ; Cohen, R. S. ; Thaddeus, P. Abstract The Columbia CO survey of the first Galactic quadrant was used to determine the locations and physical properties of the largest molecular complexes in the inner Galaxy. Within the range of the survey (l = 12-60 deg), 26 complexes were detected with masses greater than 5 x 10 to the 5th solar masses, and roughly several hundred such complexes are deduced to exist throughout the Galaxy within the solar circle. These complexes are the parent objects of much of the Population I in the Galaxy. Distances to most of the complexes were determined kinematically, the distance ambiguity being resolved with the aid of associated H II regions, OB associations, masers, and other early Population I objects. The largest complexes are good tracers of spiral structure, the Sagittarius arm in particular being delineated with unprecedented clarity. A total of 17 large complexes are distributed rather uniformly along a 15 kpc stretch of the arm with a spacing comparable to that of the strings of regularly spaced H Ii regions observed in external galaxies. Power-law relations exist between the line widths and sizes of the complexes and between their densities and sizes. The forms of these relations are in good agreement with those found previously and are extended by roughly an order of magnitude in cloud mass. Publication: The Astrophysical Journal Pub Date: June 1986 DOI: 10.1086/164304 Bibcode: 1986ApJ...305..892D Keywords: Galactic Structure; Milky Way Galaxy; Molecular Clouds; Carbon Monoxide; H Ii Regions; Least Squares Method; Noise Reduction; Quadrants; Statistical Tests; Astrophysics; GALAXIES: MILKY WAY; GALAXIES: STRUCTURE; INTERSTELLAR: MOLECULES full text sources ADS | data products SIMBAD (12)Read More
Publication Year: 1986
Publication Date: 1986-06-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 310
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot
Title: $The largest molecular cloud complexes in the first galactic quadrant
Abstract: view Abstract Citations (412) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Largest Molecular Cloud Complexes in the First Galactic Quadrant Dame, T. M. ; Elmegreen, B. G. ; Cohen, R. S. ; Thaddeus, P. Abstract The Columbia CO survey of the first Galactic quadrant was used to determine the locations and physical properties of the largest molecular complexes in the inner Galaxy. Within the range of the survey (l = 12-60 deg), 26 complexes were detected with masses greater than 5 x 10 to the 5th solar masses, and roughly several hundred such complexes are deduced to exist throughout the Galaxy within the solar circle. These complexes are the parent objects of much of the Population I in the Galaxy. Distances to most of the complexes were determined kinematically, the distance ambiguity being resolved with the aid of associated H II regions, OB associations, masers, and other early Population I objects. The largest complexes are good tracers of spiral structure, the Sagittarius arm in particular being delineated with unprecedented clarity. A total of 17 large complexes are distributed rather uniformly along a 15 kpc stretch of the arm with a spacing comparable to that of the strings of regularly spaced H Ii regions observed in external galaxies. Power-law relations exist between the line widths and sizes of the complexes and between their densities and sizes. The forms of these relations are in good agreement with those found previously and are extended by roughly an order of magnitude in cloud mass. Publication: The Astrophysical Journal Pub Date: June 1986 DOI: 10.1086/164304 Bibcode: 1986ApJ...305..892D Keywords: Galactic Structure; Milky Way Galaxy; Molecular Clouds; Carbon Monoxide; H Ii Regions; Least Squares Method; Noise Reduction; Quadrants; Statistical Tests; Astrophysics; GALAXIES: MILKY WAY; GALAXIES: STRUCTURE; INTERSTELLAR: MOLECULES full text sources ADS | data products SIMBAD (12)