INFRARED AND HARD X-RAY DIAGNOSTICS OF ACTIVE GALACTIC NUCLEUS IDENTIFICATION FROM THE SWIFT/BAT AND AKARI ALL-SKY SURVEYS

被引：33

作者：

Matsuta, K. ^{[1
,2
]}

Gandhi, P. ^{[2
]}

Dotani, T. ^{[1
,2
]}

Nakagawa, T. ^{[2
]}

Isobe, N. ^{[2
]}

Ueda, Y. ^{[3
]}

Ichikawa, K. ^{[3
]}

Terashima, Y. ^{[4
]}

Oyabu, S. ^{[5
]}

Yamamura, I. ^{[1
,2
]}

Stawarz, L. ^{[2
,6
]}

机构：

[1] Grad Univ Adv Studies, Dept Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[3] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

[4] Ehime Univ, Dept Phys, Matsuyama, Ehime 7908577, Japan

[5] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648601, Japan

[6] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 753卷 / 02期

关键词：

galaxies: active; infrared: galaxies; X-rays: galaxies; XMM-NEWTON OBSERVATIONS; SPECTRAL ENERGY-DISTRIBUTIONS; SEYFERT; GALAXIES; RADIO-LOUD; MIDINFRARED PROPERTIES; STARBURST GALAXIES; SUZAKU OBSERVATIONS; ASCA OBSERVATIONS; MID IR; FR-I;

D O I：

10.1088/0004-637X/753/2/104

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We combine data from two all-sky surveys in order to study the connection between the infrared and hard X-ray (> 10 keV) properties for local active galactic nuclei (AGNs). The Swift Burst Alert Telescope all-sky survey provides an unbiased, flux-limited selection of hard X-ray-detected AGNs. Cross-correlating the 22 month hard X-ray survey with the AKARI all-sky survey, we studied 158 AGNs detected by the AKARI instruments. We find a strong correlation for most AGNs between the infrared (9, 18, and 90 mu m) and hard X-ray (14-195 keV) luminosities, and quantify the correlation for various subsamples of AGNs. Partial correlation analysis confirms the intrinsic correlation after removing the redshift contribution. The correlation for radio galaxies has a slope and normalization identical to that for Seyfert 1 galaxies, implying similar hard X-ray/infrared emission processes in both. In contrast, Compton-thick (CT) sources show a large deficit in the hard X-ray band, because high gas column densities diminish even their hard X-ray luminosities. We propose two photometric diagnostics for source classification: one is an X-ray luminosity versus infrared color diagram, in which type 1 radio-loud AGNs are well isolated from the others in the sample. The other uses the X-ray versus infrared color as a useful redshift-independent indicator for identifying CT AGNs. Importantly, CT AGNs and starburst galaxies in composite systems can also be differentiated in this plane based upon their hard X-ray fluxes and dust temperatures. This diagram may be useful as a new indicator to classify objects in new and upcoming surveys such as WISE and NuSTAR.

引用

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