IRAS F13308+5946: A Possible Transition Phase from Type I Ultraluminous Infrared Galaxy to Optical Quasar

We present a stellar population synthesis study of a type I luminous infrared galaxy: IRAS F13308+5946. It is a quasar with absolute magnitude M{sub i} = -22.56 and has the spectral feature of a Seyfert 1.5 galaxy. Optical images show characteristics of later stages of a merger. With the help of the...

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Bibliographic Details
Published in:The Astrophysical journal 2010-08, Vol.718 (2), p.928-938
Main Authors: Meng, Xian-Min, Wu, Hong, Gu, Qiu-Sheng, Wang, Jing, Cao, Chen
Format: Article
Language:English
Subjects:
APPROXIMATIONS
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BLACK HOLES
CALCULATION METHODS
COSMIC RADIO SOURCES
Earth, ocean, space
EVOLUTION
Exact sciences and technology
GALACTIC EVOLUTION
GALAXIES
GALAXY NUCLEI
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
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Summary:We present a stellar population synthesis study of a type I luminous infrared galaxy: IRAS F13308+5946. It is a quasar with absolute magnitude M{sub i} = -22.56 and has the spectral feature of a Seyfert 1.5 galaxy. Optical images show characteristics of later stages of a merger. With the help of the stellar synthesis code STARLIGHT and both Calzetti et al.'s and Leitherer et al.'s extinction curves, we estimate the past infrared (IR) luminosities of the host galaxy and find that it may have experienced an ultraluminous infrared galaxy (ULIRG) phase for nearly 300 Myr, so this galaxy has probably experienced a type I ULIRG phase. Both nuclear starburst (SB) and active galactic nuclei contribute to the present IR luminosity budget, with the SB contributing {approx}70%. The mass of the supermassive black hole is M{sub BH} = 1.8 x 10{sup 8} M{sub sun} and the Eddington ratio L{sub bol}/L{sub Edd} is 0.12, both of which are approximate typical values of Palomar-Green QSOs. These results indicate that IRAS F13308+5946 is probably at the transitional phase from a type I ULIRG to a classical QSO.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/718/2/928