RAPID INFRARED VARIABILITY OF THREE RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES: A VIEW FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER

被引：52

作者：

Jiang, Ning ^{[1
,2
]}

Zhou, Hong-Yan ^{[1
,2
,3
]}

Ho, Luis C. ^{[4
]}

Yuan, Weimin ^{[5
]}

Wang, Ting-Gui ^{[1
,2
]}

Dong, Xiao-Bo ^{[1
,2
]}

Jiang, Peng ^{[1
,2
]}

Ji, Tuo ^{[3
]}

Tian, Qiguo ^{[3
]}

机构：

[1] Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China

[3] Polar Res Inst China, Pudong 200136, Shanghai, Peoples R China

[4] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

[5] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 759卷 / 02期

基金：

美国国家航空航天局;

关键词：

galaxies: active; galaxies: individual (SDSS J084957.98+510829.0; SDSS J094857.32+002225.5; SDSS J150506.48+032630.8); galaxies: jets; infrared: galaxies; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; SDSS J094857.3+002225; DATA RELEASE; QUASAR; OBJECTS; SAMPLE; CONTINUUM; SPECTRA;

D O I：

10.1088/2041-8205/759/2/L31

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using newly released data from the Wide-field Infrared Survey Explorer, we report the discovery of rapid infrared variability in three radio-loud narrow-line Seyfert 1 galaxies (NLS1s) selected from the 23 sources in the sample of Yuan et al. J0849+5108 and J0948+0022 clearly show intraday variability, while J1505+0326 has a longer measurable timescale within 180 days. Their variability amplitudes, corrected for measurement errors, are similar to 0.1-0.2 mag. The detection of intraday variability restricts the size of the infrared-emitting region to similar to 10(-3) pc, significantly smaller than the scale of the torus but consistent with the base of a jet. The three variable sources are exceptionally radio-loud, have the highest radio brightness temperature among the whole sample, and all show detected gamma-ray emission in Fermi/LAT observations. Their spectral energy distributions resemble those of low-energy-peaked blazars, with a synchrotron peak around infrared wavelengths. This result strongly confirms the view that at least some radio-loud NLS1s are blazars with a relativistic jet close to our line of sight. The beamed synchrotron emission from the jet contributes significantly to and probably dominates the spectra in the infrared and even optical bands.

引用

页数：6

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