Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342315t&link_type=abstract
American Astronomical Society, AAS Meeting #213, #423.15; Bulletin of the American Astronomical Society, Vol. 41, p.245
Astronomy and Astrophysics
Astronomy
Scientific paper
We demonstrate that feedback from galactic bulges can play an essential role in the halo gas dynamics and the evolution of their host galaxies by conducting a series of 1-D and 3-D simulations. In our 1-D models we approximately divide the the bulge stellar feedback into two phases: 1) a starbusrt-induced blastwave from the formation of bulge built up through frequent major mergers at high redshift and 2) a gradual feedback in forms of stellar wind and Type Ia SNe from low mass stars. Our simulations show that the combination of the two-phase feedback can heat the surrounding gas beyond the virial radius and stop further gas accretion, which naturally produces a baryon deficit around MW-like galaxies and explains the lack of large-scale X-ray halos, consistent with observations. The hot gas dynamics depends sensitively on the environment and bulge formation history. This dependency may
account for the large dispersion in the X-ray luminosities of the galaxies with similar L_B. In the 3-D simulations, we examine the spatial, thermal, and chemical substructures and their effects on X-ray measurements. The sporadic SN explosion creates wealth of filamentary and shell-like structures in the hot gas and produces a broad lognormal-like emission-measure distribution, which enhances the X-ray emission at a low and high temperatures. The luminosity at 0.3-2.0 keV band is nearly tripled due to the gas structures. We find that the SN Ia ejecta are not well-mixed with the ambient medium within the bulge scale, and the X-ray emission is primarily from shocked stellar wind materials which in general has low metallicity.
Tang Shikui
Wang Daniel Q.
No associations
LandOfFree
Stellar Feedback from Galactic Bulges does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stellar Feedback from Galactic Bulges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Feedback from Galactic Bulges will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1702720