Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (124) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (2)
· NED Objects (1)
· Also-Read Articles (Reads History)
· Translate This Page
The distribution and kinematics of neutral gas in M31
Braun, Robert
AA(Netherlands Foundation for Research in Astronomy, Dwingeloo; National Radio Astronomy Observatory, Socorro, NM)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 54-66. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Andromeda Galaxy, Gas Dynamics, Interstellar Gas, Neutral Gases, Galactic Structure, Mass Distribution, Spatial Distribution, Spiral Galaxies
Bibliographic Code:


The kinematic signature of individual spiral arm segments are used here to make a very compact yet quite complete parameterization of the global neutral hydrogen content of M31. Two continuous, trailing spiral arms can be traced from about 0.5 to 27 kpc from the nucleus which accurately account for the kinematic and spatial distribution of gas. The three-dimensional geometry of the gas distribution is derived with only limited assumptions concerning axisymmetry of the velocity field. Significant variations in inclination as a function of azimuth and radius are found, leading to departures of the local midplane from a few hundred pc in a tilted disk in the inner galaxy to in excess of a kpc in the 'warp' of the outer galaxy. The distribution of exponential scale height of the gas with radius varies between 200 and 600 pc, and the spiral pattern in the inner galaxy has an elliptical distortion which leads to significant corrections to the axisymmetric rotation velocity and implied mass distribution.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints