We present {\it Gemini} longslit optical spectroscopy and VLA radio observations of the nuclear region of NGC 4178, a late-type bulgeless disk galaxy recently confirmed to host an AGN through infrared and X-ray observations. Our observations reveal that the dynamical center of the galaxy is coincident with the location of the {\it 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.
@article{arxiv.1308.5270,
title = {A Multi-Wavelength Analysis of NGC 4178: A Bulgeless Galaxy with an AGN},
author = {Nathan Secrest and Shobita Satyapal and Sean Moran and Teddy Cheung and Marcello Giroletti and Mario Gliozzi and Marcel Bergmann and Anil Seth},
journal= {arXiv preprint arXiv:1308.5270},
year = {2015}
}
Comments
6 pages, 6 figures. Accepted for publication in the Astrophysical Journal