Molecular gas in the Andromeda galaxy
Ch. Nieten,N. Neininger,N. Neininger,M. Guelin,H. Ungerechts,R. Lucas,Elly M. Berkhuijsen,Rainer Beck,Richard Wielebinski +8 more
TLDR
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure as discussed by the authors, and it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.Abstract:
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure. As one of the astronomical objects with the best known distance (0.78 ± 0.02 Mpc), it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.read more
Citations
More filters
Journal ArticleDOI
The Quest for the Missing Dust. II. Two Orders of Magnitude of Evolution in the Dust-to-gas Ratio Resolved within Local Group Galaxies
Christopher J. R. Clark,Julia Roman-Duval,Karl D. Gordon,Caroline Bot,Matthew Smith,Lea M. Z. Hagen +5 more
TL;DR: In this paper , the authors explore the evolution of the dust-to-gas ratio with density within four well-resolved Local Group galaxies (the LMC, SMC, M31, and M33) using new Herschel maps.
A Complete CO Survey of M31
TL;DR: In this paper, an angular resolution of 8.7' in the J = 1→0 rotational transition of CO was used to survey the entire galaxy to radius of at least 16 kpc.
References
More filters
Journal ArticleDOI
A survey of interstellar H I from L-alpha absorption measurements. II
TL;DR: The Copernicus satellite surveyed the spectral region near L alpha to obtain column densities of interstellar HI toward 100 stars as discussed by the authors, and the value of the mean ratio of total neutral hydrogen to color excess was found to equal 5.8 x 10 to the 21st power atoms per (sq cm x mag).
Journal ArticleDOI
The Milky Way in Molecular Clouds: A New Complete CO Survey
TL;DR: In this article, a large-scale CO survey of the first and second Galactic quadrants and the nearby molecular cloud complexes in Orion and Taurus, obtained with the CfA 1.2 m telescope, was combined with 31 other surveys obtained over the past two decades with that instrument and a similar telescope on Cerro Tololo in Chile, to produce a new composite CO survey.
Journal ArticleDOI
Linear regression in astronomy. II
TL;DR: A wide variety of least-squares linear regression procedures used in observational astronomy, particularly investigations of the cosmic distance scale, are presented and discussed in this article, where a formula for the intercept offset between two parallel data sets, which propagates slope errors from one regression to the other, and a generalization of the Working-Hotelling confidence bands to nonstandard least squares lines.
Journal ArticleDOI
Determining structure in molecular clouds
TL;DR: In this paper, an automatic, objective routine for analyzing the clumpy structure in a spectral line position-position-velocity data cube is described, which works by first contouring the data at a multiple of the rms noise of the observations, then searching for peaks of emission which locate the clumps, and then following them down to lower intensities.
Journal ArticleDOI
The FCRAO Extragalactic CO Survey. I. The Data
Judith S. Young,Shuding Xie,Linda J. Tacconi,Pat Knezek,Paul Viscuso,Lowell E. Tacconi-Garman,Nick Scoville,Steve Schneider,F. Peter Schloerb,S. D. Lord,Amy Lesser,Jeff Kenney,Y. L. Huang,Nick Devereux,Mark J. Claussen,James Case,John M. Carpenter,Mike Berry,Lori E. Allen +18 more
TL;DR: In this article, the authors describe the galaxy sample, present the data, and determine global CO fluxes and radial distributions for the galaxies in the FCRAO Extragalactic CO Survey.