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Title: Multiple-wavelength Variability and Quasi-periodic Oscillation of PMN J0948+0022

Abstract

We present a comprehensive analysis of multiple-wavelength observational data of the first GeV-selected narrow-line Seyfert 1 galaxy PMN J0948+0022. We derive its light curves in the γ -ray and X-ray bands from the data observed with Fermi /LAT and Swift /XRT, and generate the optical and radio light curves by collecting the data from the literature. These light curves show significant flux variations. With the LAT data we show that this source is analogous to typical flat spectrum radio quasars in the L {sub γ} –Γ {sub γ} plane, where L {sub γ} and Γ {sub γ} are the luminosity and spectral index in the LAT energy band. The γ -ray flux is correlated with the V-band flux with a lag of ∼44 days, and a moderate quasi-periodic oscillation (QPO) with a periodicity of ∼490 days observed in the LAT light curve. A similar QPO signature is also found in the V-band light curve. The γ -ray flux is not correlated with the radio flux in 15 GHz, and no similar QPO signature is found at a confidence level of 95%. Possible mechanisms of the QPO are discussed. We propose that gravitational-wave observations in the future may clarify the currentmore » plausible models for the QPO.« less

Authors:
 [1]; ; ; ;  [2];  [3];  [4]
  1. Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  2. Guangxi Key Laboratory for Relativistic Astrophysics, Department of Physics, Guangxi University, Nanning 530004 (China)
  3. Department of Physics, Yunnan Normal University, Kunming 650500 (China)
  4. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22679714
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 849; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; GAMMA RADIATION; GEV RANGE; GHZ RANGE; GRAVITATIONAL WAVES; LUMINOSITY; OSCILLATIONS; PERIODICITY; QUASARS; SPECTRA; VISIBLE RADIATION; WAVELENGTHS; X RADIATION

Citation Formats

Zhang, Jin, Zhang, Hai-Ming, Zhu, Yong-Kai, Lu, Rui-Jing, Liang, En-Wei, Yi, Ting-Feng, and Yao, Su, E-mail: jinzhang@bao.ac.cn. Multiple-wavelength Variability and Quasi-periodic Oscillation of PMN J0948+0022. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8B7A.
Zhang, Jin, Zhang, Hai-Ming, Zhu, Yong-Kai, Lu, Rui-Jing, Liang, En-Wei, Yi, Ting-Feng, & Yao, Su, E-mail: jinzhang@bao.ac.cn. Multiple-wavelength Variability and Quasi-periodic Oscillation of PMN J0948+0022. United States. doi:10.3847/1538-4357/AA8B7A.
Zhang, Jin, Zhang, Hai-Ming, Zhu, Yong-Kai, Lu, Rui-Jing, Liang, En-Wei, Yi, Ting-Feng, and Yao, Su, E-mail: jinzhang@bao.ac.cn. Wed . "Multiple-wavelength Variability and Quasi-periodic Oscillation of PMN J0948+0022". United States. doi:10.3847/1538-4357/AA8B7A.
@article{osti_22679714,
title = {Multiple-wavelength Variability and Quasi-periodic Oscillation of PMN J0948+0022},
author = {Zhang, Jin and Zhang, Hai-Ming and Zhu, Yong-Kai and Lu, Rui-Jing and Liang, En-Wei and Yi, Ting-Feng and Yao, Su, E-mail: jinzhang@bao.ac.cn},
abstractNote = {We present a comprehensive analysis of multiple-wavelength observational data of the first GeV-selected narrow-line Seyfert 1 galaxy PMN J0948+0022. We derive its light curves in the γ -ray and X-ray bands from the data observed with Fermi /LAT and Swift /XRT, and generate the optical and radio light curves by collecting the data from the literature. These light curves show significant flux variations. With the LAT data we show that this source is analogous to typical flat spectrum radio quasars in the L {sub γ} –Γ {sub γ} plane, where L {sub γ} and Γ {sub γ} are the luminosity and spectral index in the LAT energy band. The γ -ray flux is correlated with the V-band flux with a lag of ∼44 days, and a moderate quasi-periodic oscillation (QPO) with a periodicity of ∼490 days observed in the LAT light curve. A similar QPO signature is also found in the V-band light curve. The γ -ray flux is not correlated with the radio flux in 15 GHz, and no similar QPO signature is found at a confidence level of 95%. Possible mechanisms of the QPO are discussed. We propose that gravitational-wave observations in the future may clarify the current plausible models for the QPO.},
doi = {10.3847/1538-4357/AA8B7A},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 849,
place = {United States},
year = {2017},
month = {11}
}