| タイトル | The Epoch of Disk Formation: z is Approximately l to Today |
| 本文（外部サイト） | http://hdl.handle.net/2060/20120008345 |
| 著者（英） | Faber, Sandra; Kassin, Susan; Weiner, Ben; Gardner, Jonathan |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2012-02-05 |
| 言語 | eng |
| 内容記述 | We present data on galaxy kinematics, morphologies, and star-formation rates over 0.1 less than z less than 1.2 for approximately 500 blue galaxies. These data show how systems like our own Milky-Way have come into being. At redshifts around 1, about half the age of the Universe ago, Milky-Way mass galaxies were different beasts than today. They had a significant amount of disturbed motions, disturbed morphologies, shallower potential wells, higher specific star-formation rates, and likely higher gas fractions. Since redshift approximately 1, galaxies have decreased in disturbed motions, increased in rotation velocity and potential well depth, become more well-ordered morphologically, and decreased in specific star-formation rate. We find interrelationships between these measurements. Galaxy kinematics are correlated with morphology and specific star-formation rate such that galaxies with the fastest rotation velocities and the least amounts of disturbed motions have the most well-ordered morphologies and the lowest specific star-formation rates. The converse is true. Moreover, we find that the rate at which galaxies become more well-ordered kinematically (i.e., increased rotation velocity, decreased disturbed motions) and morphologically is directly proportional to their stellar mass. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC.ABS.5949.2012 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
|
