A \gamma-ray emitting NLS1 galaxy SDSS J095909.51+460014.3 identified by multiwavelength contemporaneous brightening

TL;DR

This study identifies a new gamma-ray emitting narrow-line Seyfert 1 galaxy, SDSS J095909.51+460014.3, through multiwavelength observations and gamma-ray data analysis, revealing jet properties similar to other gamma-NLS1s.

Contribution

The paper presents the first identification of SDSS J095909.51+460014.3 as a gamma-ray emitting NLS1 via multiwavelength and gamma-ray data, confirming its association and jet characteristics.

Findings

Infrared variability of the NLS1 coincides with gamma-ray activity.

Gamma-ray localization confirms the NLS1 as the source.

Jet properties are consistent with other gamma-NLS1s.

Abstract

We report on an identification of a new gamma-ray emitting narrow-line Seyfert 1 galaxy (gamma-NLS1), SDSS J095909.51+460014.3 (z = 0.399), by establishing an association with a gamma-ray source 4FGL 0959.6+4606, although its low-energy counterpart was suggested to be a radio galaxy 2MASX J09591976+4603515. WISE 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 radio galaxy has been observed. A specific analysis of 15-month Fermi-LAT data, aiming at the high gamma-ray flux state, yields a significant source (TS =43). The corresponding gamma-ray localization 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 are investigated and found to be comparable with the known gamma-NLS1s.