论文标题
首次查看狭窄的Seyfert 1带有Erosita的星系
The first look at Narrow-Line Seyfert 1 Galaxies with eROSITA
论文作者
论文摘要
我们首先介绍了狭窄的seyfert 1星系（NLS1）的光谱和时序分析，并在船上具有成像望远镜阵列（EROSITA）的延长的Roentgen调查，并在Spectrum-Roentgen-Gamma（SRG）任务上进行了成像望远镜阵列（Erosita）。通过Rakshit等人的Sloan Digital Sky Survey（SDSS）DR1的光谱镜选择NLS1的目录，通过第一个Erosita All-Sky调查（ERASS1）目录的交叉匹配获得了约1,200个NLS1S的样本。 [APJS，229，39（2017）]。 X射线光谱分析基于简单的幂律拟合。如先前对NLS1S的X射线研究所预期的，光子指数分布的平均值约为2.81+-0.03。有趣的是，它是积极偏斜的，大约10％的来源位于大于4大于4的光子指数的超柔软尾巴中。这些来源进一步引起了人们的关注，因为它们的源计数在1 keV左右的值以x射线背景为X射线背景。我们认为，艾罗西塔（Erosita）已经检测到电离流出，并且可能解释了一些极端的光谱陡度，这受到光子指数和光学流出参数之间的相关性的支持。我们分析了ERASS1对样品的ERASS3光曲线的固有X射线变异性，但在单个调查扫描中也没有发现显着的可变性。
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 background at values at around 1 keV. We argue that ionised outflows have been detected by eROSITA and may account for some of the extreme spectral steepness, which is supported by correlations found between the photon index and optical outflows parameters. We analysed the intrinsic X-ray variability of the eRASS1 to eRASS3 light curves of the sample but do not find significant variability neither during the individual survey scans nor between them.
