التفاصيل البيبلوغرافية
| العنوان: |
A UNIFORM HISTORY FOR GALAXY EVOLUTION. |
| المؤلفون: |
Steinhardt, Charles. L., Speagle, Josh S. |
| المصدر: |
Astrophysical Journal; 11/21/2014, Vol. 796 Issue 1, p1-1, 1p |
| مصطلحات موضوعية: |
GALACTIC evolution, HISTORY of cosmology, GALACTIC redshift, ASTRONOMICAL observations, QUASARS, STELLAR mass, BLACK holes, STAR formation |
| مستخلص: |
Recent observations indicate a remarkable similarity in the properties of evolving galaxies at fixed mass and redshift, prompting us to consider the possibility that most galaxies may evolve with a common history encompassing star formation, quasar accretion, and eventual quiescence. We quantify this by defining a synchronization timescale for galaxies as a function of mass and redshift that characterizes the extent to which different galaxies of a common mass are evolving in the same manner at various cosmic epochs. We measure this synchronization timescale using nine different star-forming galaxy observations from the literature and Sloan Digital Sky Survey quasar observations spanning 0 < z ≲ 6. Surprisingly, this synchronization timescale is a constant, approximately 1.5 Gyr for all combinations of mass and time. We also find that the ratio between the stellar mass of galaxies turning off star formation and black hole mass of turnoff quasars is approximately 30:1, much lower than the 500:1 for quiescent galaxies at low redshift. As a result, we propose a model in which the star-forming “main sequence,” analogous quasar behavior, and other observations form a galactic evolution “main sequence,” in which star formation occurs earliest, followed by supermassive black hole accretion, and feedback between the two are dominated by deterministic rather than stochastic processes. [ABSTRACT FROM AUTHOR] |
|
Copyright of Astrophysical Journal is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
