@inproceedings{91794a47d579486a9ab725d438a899d3,
title = "A 2.5-5 μm spectroscopic study of hard X-ray selected AGNs with AKARI",
abstract = "We explore the relationships between the 3.3 μm polycyclic aromatic hydrocarbon (PAH) feature and active galactic nucleus (AGN) properties of a sample of 54 hard X-ray selected bright AGNs, including both Seyfert 1 and Seyfert 2 type objects, using the InfraRed Camera (IRC) on board the infrared astronomical satellite AKARI. The sample is selected from the 9-month Swift/BAT survey in the 14-195 keV band and all of them have measured X-ray spectra at E ≲ 10 keV. These X-ray spectra provide measurements of the neutral hydrogen column density (N H) towards the AGNs. We use the 3.3 μm PAH luminosity (L 3.3μm) as a proxy for star formation activity and hard X-ray luminosity (L 14-195keV) as an indicator of the AGN activity. We searched for possible difference of star-formation activity between type 1 (un-absorbed) and type 2 (absorbed) AGNs. Our regression analysis of log L 14-195keV versus log L 3.3μm shows a positive correlation and the slope seems steeper for type 1/unobscured AGNs than that of type 2/obscured AGNs. The same trend has been found for the log (L 14-195keV/M BH) versus log (L 3.3μm/MBH) correlation. Our analysis show that the circum-nuclear star-formation is more enhanced in type 2/absorbed AGNs than type 1/un-absorbed AGNs for low X-ray luminosity/low Eddington ratio AGNs.",
keywords = "galaxies: active, X-rays: galaxies",
author = "A. Castro and T. Miyaji and M. Shirahata and S. Oyabu and D. Clark and K. Ichikawa and M. Imanishi and T. Nakagawa and Y. Ueda",
year = "2014",
month = jul,
doi = "10.1017/S1743921314003342",
language = "English",
isbn = "9781107045248",
series = "Proceedings of the International Astronomical Union",
publisher = "Cambridge University Press",
number = "S304",
pages = "66--67",
booktitle = "Multiwavelength AGN Surveys and Studies",
address = "United Kingdom",
edition = "S304",
}
