SIMBAD references

2017ApJ...849...42Z - Astrophys. J., 849, 42-42 (2017/November-8)

Multiple-wavelength variability and quasi-periodic oscillation of PMN J0948+0022.

ZHANG J., ZHANG H.-M., ZHU Y.-K., YI T.-F., YAO S., LU R.-J. and LIANG E.-W.

Abstract (from CDS):

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 Lγγ plane, where Lγ and Γγ 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.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: PMN J0948+0022 - galaxies: jets - galaxies: Seyfert - gamma rays: galaxies - gamma rays: galaxies

Simbad objects: 6

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2019.10.14-04:17:13

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