The first look at Narrow-Line Seyfert 1 Galaxies with eROSITA
G. Gr\"unwald, Th. Boller, S. Rakshit, J. Buchner, T. Dauser, M., Freyberg, T. Liu, M. Salvato, A. Schichtel

TL;DR
This study provides the first spectral and timing analysis of nearly 1,200 Narrow-Line Seyfert 1 Galaxies using eROSITA data, revealing their X-ray spectral properties, potential ionised outflows, and variability characteristics.
Contribution
It presents the first large-scale X-ray spectral analysis of NLS1s with eROSITA, highlighting extreme spectral steepness and possible outflows, expanding understanding of these galaxies.
Findings
Photon index mean ~2.81 with positive skewness.
About 10% have super-soft photon indices >4.
No significant variability detected in the sample.
Abstract
We present the first look at the spectral and timing analysis of Narrow-Line Seyfert 1 Galaxies (NLS1s) with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma (SRG) mission. The sample of about 1,200 NLS1s was obtained via cross-match of the first eROSITA All-Sky Survey (eRASS1) catalogue with the catalogue of spectroscopically selected NLS1s from the Sloan Digital Sky Survey (SDSS) DR12 by Rakshit et al. [ApJS, 229, 39 (2017)]. The X-ray spectral analysis is based on a simple power-law fit. The photon index distribution has a mean value of about 2.81+-0.03, as expected from previous X-ray studies of NLS1s. Interestingly, it is positively skewed, and about 10 percent of the sources are located in the super-soft tail of photon indices larger than 4. These sources are of further interest as their source counts run into the X-ray…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Galaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research
