The Distribution and Kinematics of Neutral Hydrogen in NGC 807
| Autor: | L. L. Dressel |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Physics
Hydrogen Astrophysics::High Energy Astrophysical Phenomena chemistry.chemical_element Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Kinematics chemistry Oblate spheroid Elliptical galaxy Minor axis Astrophysics::Solar and Stellar Astrophysics Hydrogen line Arecibo Observatory Astrophysics::Galaxy Astrophysics Distribution (differential geometry) |
| Zdroj: | Structure and Dynamics of Elliptical Galaxies ISBN: 9789027725868 |
| Popis: | I have detected 21 cm line emission from neutral hydrogen in the giant elliptical galaxy NGC 807 at Arecibo Observatory, and I have mapped this emission with the VLA. Unlike the active and dwarf ellipticals that have been mapped thus far, NGC 807 has a fairly regular disk of gas rotating about the apparent optical minor axis. Combined with observations of active ellipticals, this observation suggests that two classes of HI-rich ellipticals may exist: ellipticals which have accreted gas and become active recently, and quiescent ellipticals which have either produced gas internally or accreted it so long ago that it has reached dynamical equilibrium. |
| Databáze: | OpenAIRE |
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