A MULTI-WAVELENGTH ANALYSIS OF NGC 4178: A BULGELESS GALAXY WITH AN ACTIVE GALACTIC NUCLEUS

被引：13

作者：

Secrest, N. J. ^{[1
]}

Satyapal, S. ^{[1
]}

Moran, S. M. ^{[2
]}

Cheung, C. C. ^{[3
]}

Giroletti, M. ^{[4
]}

Gliozzi, M. ^{[1
]}

Bergmann, M. P. ^{[5
]}

Seth, A. C. ^{[6
]}

机构：

[1] George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA

[2] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[3] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

[4] INAF Ist Radioastron, I-40129 Bologna, Italy

[5] NOAO Gemini Sci Ctr Chile, Tucson, AZ 85726 USA

[6] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 777卷 / 02期

关键词：

black hole physics; galaxies: active; galaxies: bulges; galaxies: kinematics and dynamics; galaxies: spiral; radio continuum: galaxies; MASS BLACK-HOLE; FUNDAMENTAL PLANE; CHANDRA VIEW; STAR CLUSTER; RADIO; DISCOVERY; EMISSION; SAMPLE; CLASSIFICATION; LUMINOSITY;

D O I：

10.1088/0004-637X/777/2/139

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Gemini longslit optical spectroscopy and Very Large Array radio observations of the nuclear region of NGC 4178, a late-type bulgeless disk galaxy recently confirmed to host an active galactic nucleus (AGN) through infrared and X-ray observations. Our observations reveal that the dynamical center of the galaxy is coincident with the location of the Chandra X-ray point source discovered in a previous work, providing further support for the presence of an AGN. While the X-ray and IR observations provide robust evidence for an AGN, the optical spectrum shows no evidence for the AGN, underscoring the need for the penetrative power of mid-IR and X-ray observations in finding buried or weak AGNs in this class of galaxy. Finally, the upper limit to the radio flux, together with our previous X-ray and IR results, is consistent with the scenario in which NGC 4178 harbors a deeply buried AGN accreting at a high rate.

引用

页数：6

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