FERMI/LAT OBSERVATIONS OF SWIFT/BAT SEYFERT GALAXIES: ON THE CONTRIBUTION OF RADIO-QUIET ACTIVE GALACTIC NUCLEI TO THE EXTRAGALACTIC γ-RAY BACKGROUND

被引：23

作者：

Teng, Stacy H. ^{[1
,2
,3
]}

Mushotzky, Richard F. ^{[1
]}

Sambruna, Rita M. ^{[4
]}

Davis, David S. ^{[2
,3
,5
]}

Reynolds, Christopher S. ^{[1
]}

机构：

[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[2] NASA GSFC, CRESST, Greenbelt, MD 20771 USA

[3] NASA GSFC, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[4] George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA

[5] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 742卷 / 02期

关键词：

galaxies: active; galaxies: Seyfert; gamma rays: diffuse background; X-rays: diffuse background; X-rays: galaxies; ADVECTION-DOMINATED ACCRETION; BURST ALERT TELESCOPE; LARGE-AREA TELESCOPE; BLAZAR SEQUENCE; BLACK-HOLES; SKY SURVEY; LUMINOSITY; EMISSION; CATALOG; ORIGIN;

D O I：

10.1088/0004-637X/742/2/66

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the analysis of 2.1 years of Fermi Large Area Telescope (LAT) data on 491 Seyfert galaxies detected by the Swift Burst Alert Telescope (BAT) survey. Only the two nearest objects, NGC 1068 and NGC 4945, which were identified in the Fermi first year catalog, are detected. Using Swift/BAT and radio 20 cm fluxes, we define a new radio-loudness parameter R-X,R-BAT where radio-loud objects have log R-X,R-BAT > -4.7. Based on this parameter, only radio-loud sources are detected by Fermi/LAT. An upper limit to the flux of the undetected sources is derived to be similar to 2x10(-11) photons cm(-2) s(-1), approximately seven times lower than the observed flux of NGC 1068. Assuming a median redshift of 0.031, this implies an upper limit to the gamma-ray (1-100 GeV) luminosity of less than or similar to 3 x 10(41) erg s(-1). In addition, we identified 120 newFermi/LAT sources near the Swift/BAT Seyfert galaxies with significant Fermi/LAT detections. A majority of these objects do not have Swift/BAT counterparts, but their possible optical counterparts include blazars, flat-spectrum radio quasars, and quasars.

引用

页数：8

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