How Do Supermassive Black Holes Get Starved? Q. D. Wang, Z. Y. Li, S.-K. Tang University of Massachusetts B. Wakker University of Wisconsin.

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Presentation transcript:

How Do Supermassive Black Holes Get Starved? Q. D. Wang, Z. Y. Li, S.-K. Tang University of Massachusetts B. Wakker University of Wisconsin

M31 Bulge: a Case Study Li & Wang 2007; Li & Wang, Wakker 2009 The SMBH of M bh ~ 2 x 10 8 Msun; the observed upper limit Lx ~ 1 x erg/s. Gas is being supplied from both the disk and bulge: e.g., evolved stars release ~ 0.1 Msun/yr in the M31 bulge. If accreted by the SMBH, the expected Lx ~ 6 x erg/s. So this gas is not accreted and is also not accumulating in the bulge (only ~ 10 6 Msun is observed). IRAC 24 micron, K-band, keV

The Gas is heated and is escaping! Characteristics of hot gas in the bulge: Bipolar morphology z 0 ~ 600 pc T~ 3 x 10 6 K L keV ~ 3  erg/s Enhanced X-ray emission from a circumnuclear spiral. IRAC 24 micron, K-band, keV Li & Wang 2007; Li & Wang, Wakker 2009

Hydro-simulation of SNRs, bulge wind, nuclear disk, and SMBH accretion Full box size =4 kpc Adaptive mesh refinement down to 0.5 pc (FLASH code) A cool gas inflow is assumed to continuously feed the nuclear disk around the SMBH of 3 x 10 8 Msun. The Ia SN (4x10 -4 /yr), and stellar wind injections follow the stellar light. The injections drive a bulge wind and also reduces the accretion to the SMBH. The disk is being evaporated  mass loading to the hot gas. 800 pcTang et al Density cut

FUSE Detection of the OVI absorption line toward the M31 nucleus Absorption in the integrated stellar FUV spectrum (mostly due to HB stars) Effective foreground N OVI = 4 x cm -2 The absorption line centroid at V ~ -280 km/s, compared to the M31 bulge’s systemic velocity -300 km/s  gas falling toward the center! A likely scenario is that the OVI traces the stellar mass loss being heated to hot gas. =1032 = H 2

S0 galaxy: NGC 5800 Li et al. 2009

Conclusions Large amount of gas is injected into galactic bulges, but is not accreted by SMBHs or accumulating. Type Ia SNe can effectively heat the gas and drive bulge-wide outflows. Such outflows can greatly influence galaxy evolution as well as starve the SMBHs.