Mathematics – Probability
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335401s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #354.01; Bulletin of the American Astronomical Society, Vol. 41, p.495
Mathematics
Probability
Scientific paper
Using a hydrodynamical galaxy evolution model which includes both stellar and AGN feedback, I investigate what kind of AGN feedback models can explain the evolution of elliptical galaxies and their characteristic properties.
It is difficult to make AGN feedback models that only deposit energy mechanically be consistent with the observed relationship between X-ray luminosity and galaxy stellar mass or between black hole mass and stellar mass, as well as typical star-formation history for local ellipticals. Meanwhile, when incorporating radiative feedback by strong radiation from AGN with mechanical feedback models, the characteristics of elliptical galaxies are well explained with a reasonable range of parameters. This result suggests that a simple treatment of AGN feedback in a mechanical feedback mode might need more careful studies.
As motivated by the success of combining mechanical and radiative
feedback modes, I also examine the evolution of model galaxies in various environments, which are described by different truncation radii of gas in the galaxies.The difference in environments results in a significant variety of star-formation history for a galaxy of a given mass. This difference naturally can explain why satellite elliptical galaxies have redder colors than isolated elliptical galaxies for a given mass, because the environment of satellite galaxies causes an early stop in star formation. The model also shows that gas accretion and quasar activity is also regulated by different kinds of environment. Since the gas accretion follows star formation in the models, the results imply that a cluster environment has a higher probability of having an AGN phase. Recent observations of the AGN fraction in galaxy clusters are consistent with the models.
In short, the model of combining mechanical and radiative feedback from AGN passes several tests that are supported by a broad range of observational results.
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