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

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...

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Bibliographic Details
Published in:The Astrophysical journal 2013-11, Vol.777 (2), p.1-6, Article 139
Main Authors: Secrest, N J, Satyapal, S, Moran, S M, Cheung, C C, Giroletti, M, Gliozzi, M, Bergmann, M P, Seth, A C
Format: Article
Language:English
Subjects:
Accretion
Active galactic nuclei
Arrays
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BLACK HOLES
Disk galaxies
Flux
GALAXIES
GALAXY NUCLEI
Infrared
INFRARED SPECTRA
Spectroscopy
STAR CLUSTERS
VISIBLE SPECTRA
WAVELENGTHS
X-RAY SPECTRA
X-rays
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Summary: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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/777/2/139