POX 52: A dwarf Seyfert 1 galaxy with an intermediate-mass black hole

被引:221
作者
Barth, AJ [1 ]
Ho, LC
Rutledge, RE
Sargent, WLW
机构
[1] CALTECH, Dept Astron, Pasadena, CA 91125 USA
[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
关键词
galaxies : active; galaxies : dwarf; galaxies : individual (POX 52); galaxies : kinematics and dynamics; galaxies : nuclei; galaxies : Seyfert;
D O I
10.1086/383302
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe new optical images and spectra of POX 52, a dwarf galaxy with an active nucleus that was originally detected in the POX objective-prism survey. While POX 52 was originally thought to be a Seyfert 2 galaxy, the new data reveal an emission-line spectrum very similar to that of the dwarf Seyfert 1 galaxy NGC 4395, with broad components to the permitted line profiles, and we classify POX 52 as a Seyfert 1 galaxy. The host galaxy appears to be a dwarf elliptical, and its brightness profile is best fit by a Sersic model with an index of 3.6 +/- 0.2 and a total magnitude of M-V = 17.6. Applying mass - luminosity - line width scaling relations to estimate the black hole mass from the broad Hbeta line width and nonstellar continuum luminosity, we find M-BH approximate to 1.6 x 10(5) M-.. The stellar velocity dispersion in the host galaxy, measured from the Ca II lambda8498, 8542 lines, is 36 +/- 5 km s(-1), also suggestive of a black hole mass of order 10(5) M-.. Further searches for active nuclei in dwarf galaxies can provide unique constraints on the demographics of black holes in the mass range below 10(6) M-..
引用
收藏
页码:90 / 102
页数:13
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