Study the ULIRGs Evolutionary Scenario through IRAS F13308+5946

Details Study the ULIRGs Evolutionary Scenario through IRAS F13308+5946 Study the ULIRGs Evolutionary Scenario through IRAS F13308+5946

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..218m&link_type=abstract

The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha

Astronomy and Astrophysics

Astronomy

Scientific paper

We take a stellar population synthesis study of a luminous infrared galaxy (LIRG) IRAS F13308+5946 LIR=1011.6 L&sun; and intend to give a new method to study the ULIRGs evolutionary scenario. Spectral synthesis result revealed that the host galaxy has a recent star-forming activity since ˜300 Myr ago. We estimate the maximum IR luminosity during the recent star formation process and find it has a ULIRG phase (LIR=1012.6 L&sun;) ˜100 Myr ago. Nuclear starburst has more contribution (˜ 60%) than AGN to the present IR luminosity budget. The ongoing star formation rate (SFR), the supermassive black hole mass (MBH), the Eddington ratio (Lbol/LEdd) and accretion rate (dot{M}) are also calculated, which show a late stage of black-hole growth phase. Our result support the evolutionary scenario as Sanders et al. (1988) had proposed that merger induced ULIRGs would evolve into QSOs.

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