| Type |
Journal Article |
| Names |
M. Meléndez, R. F. Mushotzky, T. T. Shimizu, A. J. Barger, L. L. Cowie |
| Publication |
The Astrophysical Journal |
| Volume |
794 |
| Issue |
2 |
| Pages |
152 |
| Journal Abbreviation |
The Astrophysical Journal |
| Date |
October 1, 2014 |
| DOI |
10.1088/0004-637X/794/2/152 |
| ISSN |
0004-637X |
| URL |
http://adsabs.org/2014ApJ.794.152M |
| Library Catalog |
adslabs.org |
| Abstract |
Far-Infrared (FIR) photometry from the Photodetector Array Camera and
Spectrometer on the Herschel Space Observatory is presented for 313
nearby, hard X-ray selected galaxies from the 58 month Swift Burst Alert
Telescope (BAT) Active Galactic Nuclei catalog. The present data do not
distinguish between the FIR luminosity distributions at 70 and 160 μm
for Seyfert 1 and Seyfert 2 galaxies. This result suggests that if the
FIR emission is from the nuclear obscuring material surrounding the
accretion disk, then it emits isotropically, independent of orientation.
Alternatively, a significant fraction of the 70 and 160 μm luminosity
could be from star formation, independent of active galactic nucleus
(AGN) type. Using a non-parametric test for partial correlation with
censored data, we find a statistically significant correlation between
the AGN intrinsic power (in the 14-195 keV band) and the FIR emission at
70 and 160 μm for Seyfert 1 galaxies. We find no correlation between
the 14-195 keV and FIR luminosities in Seyfert 2 galaxies. The observed
correlations suggest two possible scenarios: (1) if we assume that the
FIR luminosity is a good tracer of star formation, then there is a
connection between star formation and the AGN at sub-kiloparsec scales,
or (2) dust heated by the AGN has a statistically significant
contribution to the FIR emission. Using a Spearman rank-order analysis,
the 14-195 keV luminosities for the Seyfert 1 and 2 galaxies are weakly
statistically correlated with the F 70/F 160
ratios.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA. |
| Tags |
X-rays: galaxies, galaxies: Seyfert, galaxies: active, galaxies: nuclei, infrared: galaxies |