|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Black hole growth and activity in a LambdaCDM Universe | | Tiziana Di Matteo
; Rupert A.C. Croft
; Volker Springel
; Lars Hernquist
; | | Date: |
29 Dec 2002 | | Journal: | Astrophys.J. 593 (2003) 56-68 | | Subject: | astro-ph | | Affiliation: | MPA), Rupert A.C. Croft (Carnegie Mellon), Volker Springel (MPA), Lars Hernquist (CfA | | Abstract: | (abridged) The observed properties of supermassive black holes suggest a fundamental link between their assembly and the formation of their host spheroids. We model the growth and activity of black holes in galaxies using LambdaCDM cosmological hydrodynamic simulations by following the evolution of the baryonic mass component in galaxy potential wells. We find that the observed steep relation between black hole mass and spheroid velocity dispersion, M_BH propto sigma^4, is reproduced if the gas mass in bulges is linearly proportional to the black hole mass. In this model, black hole growth saturates because of the competition with star-formation and feedback, both of which determine the gas fraction available for accretion. Unless other processes also operate, we predict that the M_BH-sigma$ relation is not set in primordial structures but is fully established at low redshifts, $z approxlt 2$, and is shallower at earlier times. We find that that central black hole masses are related to their dark matter halos simply via M_BH ~ M_DM^4/3. We assume that galaxies undergo a quasar phase with a typical lifetime, t_Q ~ 2 imes 10^7 yr and show that star-formation regulated depletion of gas in spheroids can explain the decrease of the quasar population at redshift z<3 in the optical blue band. However, with the simplest assumption of a redshift independent quasar lifetime, the model overpredicts optical quasar numbers at high redshifts although it yields the observed evolution of number density of X-ray quasars over the redshift range 1 < z< 6. Finally, we find that the majority of black hole mass is assembled in galaxies by z ~ 3 and that the black hole accretion rate density peaks in rough correspondence to the star formation rate density at z ~ 4-5. | | Source: | arXiv, astro-ph/0301586 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER