Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1601t&link_type=abstract
American Astronomical Society Meeting 208, #16.01; Bulletin of the American Astronomical Society, Vol. 38, p.97
Astronomy and Astrophysics
Astronomy
Scientific paper
Bulges/spheroids of early-type spirals (Sb-Sa), S0, and elliptical galaxies are comprised of primarily old stars, which account for more than half of the stellar mass in the local Universe. These stars collectively generate a strong feedback in form of stellar winds and Type Ia supernovae. Such stellar feedback from galactic bulges, relatively gentle but long lasting, can play an essential role in both shaping the evolution of the galaxies. We have conducted a pilot investigation of the feedback, based on 3-D hydrodynamical simulations. We have completed a simulation of the bulge-wide wind as well as the supernova heating on scales down to about 6 pc for a bulge similar to the one in our own Galaxy or M31. We are also conducting simulations of large bulges such as the one in Sombrero galaxy. These simulations enable us for the first time to explore the density, temperature, and metal abundance substructures of hot gas and their effects on the X-ray morphology and spectrum of the bulge winds. The contribution of the supernova-heated gas to the diffuse X-ray emission in bulges is estimated and comparisons are made with observations.
Joung Minkyoo
Mac Low Mordecai-Mar
Tang Shikui
Wang Qiangguo
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