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arxiv: astro-ph/0610145 · v2 · submitted 2006-10-05 · 🌌 astro-ph

SDSS J160531.84+174826.1: A Dwarf Disk Galaxy With An Intermediate-Mass Black Hole

Xiaobo Dong (1 , 2) , Tinggui Wang (1 , Weimin Yuan (3) , Hongguang Shan (3) , Hongyan Zhou (1 , 2 , 4)
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Lulu Fan (1 Liming Dou (3) Huiyuan Wang (1 Junxian Wang (1 Honglin Lu (1 2) ((1) University of Science Technology of China (USTC) (2) Joint Institute of Galaxies Cosmology Shanghai Observatory USTC (3) National Astronomical Observatories/Yunnan Observatory (4) University of Florida)
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keywords galaxyblackdwarfholenucleusbroadcomponentdetected
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We report the discovery of a dwarf Seyfert 1 active galactic nucleus (AGN) with a candidate intermediate-mass black hole hosted by the dwarf galaxy SDSS J160531.84+174826.1 at z=0.032. A broad component of the H-alpha line with FWHM=781 km/s is detected in its optical spectrum, and a bright, point-like nucleus is evident from a HST imaging observation. Non-thermal X-ray emission is also detected from the nucleus. The black hole mass, as estimated from the luminosity and width of the broad H-alpha component, is about 7x10^4 \msun. The host galaxy appears to be a disk galaxy with a boxy bulge or nuclear bar; with an absolute magnitude of M_R = -17.8 (M_B = -16.4), it is among the least luminous host galaxies ever identified for a Seyfert 1.

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