论文标题
伽马射线Blazars S4 0954+65，TXS 1515-273和RX J0812.0+0237的光谱表征
Optical spectral characterization of the gamma-ray blazars S4 0954+65, TXS 1515-273 and RX J0812.0+0237
论文作者
论文摘要
由于缺乏有关其红移和低能光子场的信息，通常会阻碍对伽马射线的研究。此信息是了解由于乳清外背景光和/或固有吸收和发射过程而导致的对伽马射线吸收的影响的关键。所有这些信息还影响了确定相对论喷气机中发射区域的位置。在这项工作中，给出了三个伽玛 - 射线布拉扎尔的新光谱特征：S4 0954+65，TXS 1515-273和RX J0812.0+0237。对于所有三个目标，红移确定都是成功的，在TXS 1515-273和RX J0812.0+0237的情况下首次。根据这些新的光谱，确认它们为BL〜LAC类型的分类。对于S4 0954+65（z = $ 0.3694 \ pm0.0011 $），根据观察到的光学发射线执行磁盘，宽线区域和圆环光度的估计。这项研究的结果与S4 0954+65的性质兼容。对于TXS 1515-273（$ z = 0.1281 \ pm 0.0004 $），尽管它的光谱由喷气机的连续发射（应用PPXF技术）主导，但可以揭开出色的人群，并与旧的和金属的人群兼容。 RX J0812.0+0237（$ z = 0.1721 \ pm 0.0002 $）也是这种情况。此外，这项工作证实了来自RX J0812.0+0237的光谱与极端的Blazar分类兼容。
The study of gamma-ray blazars is usually hindered due to the lack of information on their redshifts and on their low energy photon fields. This information is key to understand the effect on the gamma-ray absorption due to either extragalactic background light and/or intrinsic absorption and emission processes. All this information has also an impact on the determination of the location of the emitting region within the relativistic jets. In this work a new optical spectroscopic characterization is presented for three gamma-ray blazars: S4 0954+65, TXS 1515-273 and RX J0812.0+0237. For all the three targets the redshift determination is successful, and for the first time in the case of TXS 1515-273 and RX J0812.0+0237. Their classification as BL~Lac type is confirmed based on these new optical spectra. For S4 0954+65 (z=$0.3694\pm0.0011$) an estimation on the disk, broad line region and torus luminosities is performed based on the observed optical emission lines. The results from this study are compatible with the nature of S4 0954+65 as a transitional blazar. In the case of TXS 1515-273 ($z=0.1281\pm 0.0004$), although its optical spectrum is dominated by the continuum emission from the jet, applying the pPXF technique, the stellar population can be unveiled and is compatible with an old and metallic population. It is also the case of RX J0812.0+0237 ($z=0.1721\pm 0.0002$). Moreover, this work confirms that the optical spectrum from RX J0812.0+0237 is compatible with an extreme blazar classification.
