Issue |
A&A
Volume 676, August 2023
|
|
---|---|---|
Article Number | A9 | |
Number of page(s) | 9 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/202245599 | |
Published online | 26 July 2023 |
A γ-ray-emitting NLS1 galaxy, SDSS J095909.51+460014.3, identified by multi-wavelength contemporaneous brightening
1
Department of Physics and Astronomy, College of Physics, Guizhou University, Guiyang 550025, PR China
e-mail: nhliao@gzu.edu.cn
2
Institute of Deep Space Sciences, Deep Space Exploration Laboratory, Hefei 230026, PR China
e-mail: shengzf@ustc.edu.cn
3
Deep Space Exploration Laboratory/Department of Astronomy, University of Science and Technology of China, Hefei 230026, PR China
4
School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, PR China
5
CAS Key laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, PR China
6
Technion Israel Institute of Technology, Department of Physics, Haifa 3200003, Israel
Received:
1
December
2022
Accepted:
26
May
2023
We report on the identification of a new γ-ray-emitting narrow-line Seyfert 1 galaxy (γ-NLS1), SDSS J095909.51+460014.3 (z = 0.399), by establishing an association with a γ-ray source 4FGL 0959.6+4606, although its low-energy counterpart was suggested to be a radio galaxy (RG) 2MASX J09591976+4603515. Wide-field Infrared Survey Explorer long-term light curves of these two sources reveal diverse infrared variability patterns. Brightenings of 2.5 mag are detected for the former source, while flux decays of 0.5 mag are found for the other one. More importantly, the time that the infrared flux of the NLS1 rises is coincident with the time of flux increase of 4FGL 0959.6+4606. At the same time, no infrared activity of the RG has been observed. A specific analysis of 15-month data from Large Area Telescope aboard Fermi, aimed at the high γ-ray flux state, yields a significant source (TS = 43). The corresponding γ-ray localisation analysis suggests that only the NLS1 falls into the uncertainty area, further supporting the updated association relationship. A broadband spectral energy distribution of SDSS J095909.51+460014.3 has been drawn and well described by the classic single-zone homogeneous leptonic jet model. Its jet properties were investigated and found to be comparable with the known γ-NLS1s.
Key words: galaxies: active / galaxies: jets
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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