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

Abstract

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 {approx}0.1-0.2 mag. The detection of intraday variability restricts the size of the infrared-emitting region to {approx}10{sup -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.

Authors:
; ; ; ;  [1];  [2];  [3]; ;  [4]
  1. Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Science, Hefei, Anhui 230026 (China)
  2. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
  3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  4. Polar Research Institute of China, 451 Jinqiao Road, Pudong, Shanghai 200136 (China)
Publication Date:
OSTI Identifier:
22078449
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; BRIGHTNESS; ENERGY SPECTRA; GALAXIES; GAMMA RADIATION; INFRARED SURVEYS; JETS; PHOTON EMISSION; RELATIVISTIC RANGE; SYNCHROTRON RADIATION; WAVELENGTHS

Citation Formats

Jiang Ning, Zhou Hongyan, Wang Tinggui, Dong Xiaobo, Jiang Peng, Ho, Luis C., Yuan Weimin, Ji Tuo, and Tian Qiguo, E-mail: jnac@mail.ustc.edu.cn. RAPID INFRARED VARIABILITY OF THREE RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES: A VIEW FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER. United States: N. p., 2012. Web. doi:10.1088/2041-8205/759/2/L31.
Jiang Ning, Zhou Hongyan, Wang Tinggui, Dong Xiaobo, Jiang Peng, Ho, Luis C., Yuan Weimin, Ji Tuo, & Tian Qiguo, E-mail: jnac@mail.ustc.edu.cn. RAPID INFRARED VARIABILITY OF THREE RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES: A VIEW FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER. United States. doi:10.1088/2041-8205/759/2/L31.
Jiang Ning, Zhou Hongyan, Wang Tinggui, Dong Xiaobo, Jiang Peng, Ho, Luis C., Yuan Weimin, Ji Tuo, and Tian Qiguo, E-mail: jnac@mail.ustc.edu.cn. Sat . "RAPID INFRARED VARIABILITY OF THREE RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES: A VIEW FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER". United States. doi:10.1088/2041-8205/759/2/L31.
@article{osti_22078449,
title = {RAPID INFRARED VARIABILITY OF THREE RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES: A VIEW FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER},
author = {Jiang Ning and Zhou Hongyan and Wang Tinggui and Dong Xiaobo and Jiang Peng and Ho, Luis C. and Yuan Weimin and Ji Tuo and Tian Qiguo, E-mail: jnac@mail.ustc.edu.cn},
abstractNote = {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 {approx}0.1-0.2 mag. The detection of intraday variability restricts the size of the infrared-emitting region to {approx}10{sup -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.},
doi = {10.1088/2041-8205/759/2/L31},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}