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摘要
We present early results of the Herschel PACS (70 and 160 mu m) and SPIRE (250, 350, and 500 mu m) survey of 313 low redshift (z < 0.05), ultra-hard X-ray (14-195 keV) selected active galactic nuclei (AGNs) from the 58 month Swift/Burst Alert Telescope catalog. Selection of AGNs from ultra-hard X-rays avoids bias from obscuration, providing a complete sample of AGNs to study the connection between nuclear activity and star formation in host galaxies. With the high angular resolution of PACS, we find that >35% and >20% of the sources are "point-like" at 70 and 160 mu m respectively and many more have their flux dominated by a point source located at the nucleus. The inferred star formation rates (SFRs) of 0.1-100 M-circle dot yr(-1) using the 70 and 160 mu m flux densities as SFR indicators are consistent with those inferred from Spitzer Ne II fluxes, but we find that 11.25 mu m polycyclic aromatic hydrocarbon data give similar to 3x lower SFR. Using GALFIT to measure the size of the far-infrared emitting regions, we determined the SFR surface density (M-circle dot yr(-1) kpc(-2)) for our sample, finding that a significant fraction of these sources exceed the threshold for star formation driven winds (0.1M(circle dot) yr(-1) kpc(-2)).
- 出版日期2014-2-1
