Nozomu Kawakatu et al. 2006 ApJ 637 104 doi:10.1086/498255
Type I Ultraluminous Infrared Galaxies: Transition Stage from ULIRGs to QSOs
FREENozomu Kawakatu1, Naohisa Anabuki2, Tohru Nagao3, Masayuki Umemura4 and Takao Nakagawa5
Show affiliationsWe examine whether the ultraluminous infrared galaxies that contain a type 1 Seyfert nucleus (a type I ULIRG) are in the transition stage from ULIRGs to quasi-stellar objects (QSOs). To investigate this issue, we compare the black hole (BH) mass, the bulge luminosity, and the far-infrared luminosity among type I ULIRGs, QSOs, and elliptical galaxies. As a result, we find the following results: (1) The type I ULIRGs have systematically smaller BH masses in spite of the comparable bulge luminosity relative to QSOs and elliptical galaxies. (2) The far-infrared luminosity of most type I ULIRGs is larger than the Eddington luminosity. We show that the above results do not change significantly for three type I ULIRGs for which we can estimate the visual extinction from the column density. Also, for all eight type I ULIRGs, we investigate the effect of uncertainties of BH mass measurements and our sample bias to make sure that our results are not altered even if we consider the above two effects. In addition, Anabuki recently revealed that their X-ray properties are similar to those of the narrow-line Seyfert 1 galaxies. These would indicate that active galactic nuclei (AGNs) with a high mass accretion rate exist in type I ULIRGs. On the basis of all of these findings, we conclude that it would be a natural interpretation that type I ULIRGs are the early phase of BH growth, namely, the missing link between ULIRGs and QSOs. Moreover, by comparing our results with a theoretical model of a coevolution scenario of a QSO BH and a galactic bulge, we show clearly that this explanation could be valid.
- Subject headings
black hole physics; galaxies: active; galaxies: bulges; galaxies: formation; galaxies: starburst; quasars: general
- Dates
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Issue 1 (2006 January 20)
Received 2005 June 21, accepted for publication 2005 September 14
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Type I Ultraluminous Infrared Galaxies: Transition Stage from ULIRGs to QSOs
Nozomu Kawakatu et al. 2006 ApJ 637 104
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