Feedback Observations and Simulations of Elliptical Galaxies. Daniel Wang, Shikui Tang, Yu Lu, Houjun Mo (UMASS) Mordecai Mac-Low (AMNH) Ryan Joung (Princeton) Zhiyuan Li (CfA). 3-D stellar feedback simulation. NGC 4697: X-ray intensity contours. Key questions to address.
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3-D stellar feedback simulation
NGC 4697: X-ray intensity contours
Understanding the cause of the bi-modality of galaxies
Specific temperature:T ~ 1-2 Kev
David et al (2006)
O’Sullivan & Ponman (2004),Irwin et al (2001), Irwin (2008)
Observations of stellar feedback
Bregman et al (2004)
Tang et al 2009
Tang & Wang 2009
10x10x10 kpc3 BoxDensity snapshot
Differential Emission Measure
Only reasonable for low-mass
Tang et al 2009b
SN ejecta evolution
Tang & Wang in prep
1-D outflow model
1-D wind model
Positive temperature gradient,mimicking a “cooling flow”!
Positive Fe abundance gradient, as observed in central regions of ellipticals
Cosmological baryon fraction
Total baryon at present
Hot gasGalaxies such as the MW evolves in hot bubbles of baryon deficit!
Tang & Wang 2005, 2009
Tang et al. 2009
~1% of the SN mechanical energy input!
~10 times lower than expected from Type Ia heating and mass-loss from evolved stars!
inconsistent with the SN enrichment!
IRAC 8 micro, K-band, 0.5-2 keV
Li & Wang (2007); Li, Wang, Wakker (2009); Bogdan & Gilfanov 2008