The distribution and kinematics of neutral gas in M31
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...
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| Veröffentlicht in: | The Astrophysical journal 1991-05, Vol.372 (1), p.54-66 |
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| creator | BRAUN, R |
| description | 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. 48 refs. |
| doi_str_mv | 10.1086/169954 |
| format | Article |
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Extragalactic objects and systems (by type)</subject><subject>PARTICLE KINEMATICS</subject><subject>SPACE</subject><subject>SPATIAL DISTRIBUTION</subject><subject>SPIRAL CONFIGURATION</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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The universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>BRAUN, R</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>BRAUN, R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The distribution and kinematics of neutral gas in M31</atitle><jtitle>The Astrophysical journal</jtitle><date>1991-05-01</date><risdate>1991</risdate><volume>372</volume><issue>1</issue><spage>54</spage><epage>66</epage><pages>54-66</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>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. 48 refs.</abstract><cop>Chicago, IL</cop><pub>University of Chicago Press</pub><doi>10.1086/169954</doi><tpages>13</tpages></addata></record> |
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| ispartof | The Astrophysical journal, 1991-05, Vol.372 (1), p.54-66 |
| issn | 0004-637X 1538-4357 |
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| subjects | 640105 - Astrophysics & Cosmology- Galaxies Astronomy CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS CONFIGURATION COSMIC GASES COSMIC RADIO SOURCES DISTRIBUTION Earth, ocean, space Exact sciences and technology FLUID MECHANICS FLUIDS GALAXIES GASES H1 REGIONS INTERSTELLAR SPACE MASS DISTRIBUTION MECHANICS MORPHOLOGY Normal galaxies. Extragalactic objects and systems (by type) PARTICLE KINEMATICS SPACE SPATIAL DISTRIBUTION SPIRAL CONFIGURATION Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | The distribution and kinematics of neutral gas in M31 |
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