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arXiv 2208.04763astro-ph.HE
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SMS4样品的快速X射线视图--31个类星体和射电星系的X射线特性

A Swift X-ray view of the SMS4 sample -- X-ray properties of 31 quasars and radio galaxies

Alessandro Maselli, William R. Forman, Christine Jones, Ralph P. Kraft, Matteo Perri

摘要:

我们提出了来自SMS 4目录的31个源的Swift观测,该目录是南半球137个明亮射电源的样本。所有这些来源都没有Chandra或XMM-Newton观测:其中24个是通过2015年的一个专门提案用Swift观测的,其余7个的数据是从Swift档案中检索的。通过对斯威夫特X射线望远镜(XRT)收集的数据进行整理和分析,在0.3- 10千电子伏波段探测到20个。我们提供的X射线发射在这个波段的这20个检测的细节,以及其余11个SMS 4源的上限。在统计学允许的情况下,我们研究了X射线发射的程度、硬度比,并进行了光谱分析。我们将20个X射线探测源与红外(AllWISE,CatWISE 2020)和光学(GSC 2.3.2,DES DR 2)目录进行匹配,以建立与红外和光学源的关联,并将我们的结果与这些波段中先前发表的对应结果进行比较。需要在红外和光学波段的检测,以建立一个候选人对应我们的X射线检测,我们获得可靠的对应物为18个来源,而其余两个来源需要进一步调查,以建立坚定的身份。我们发现,所有的SMS 4源的~35%低于10.9焦耳在178 MHz的通量密度的下限。我们提出了56个SMS 4源的列表,这些源在2022年3月仍然需要用窄场仪器在X射线中观察。

英文摘要:

We present Swift observations of 31 sources from the SMS4 catalog, a sample of 137 bright radio sources in the Southern Hemisphere. All these sources had no Chandra or XMM-Newton observations: 24 of these were observed with Swift through a dedicated proposal in 2015, and data for the remaining seven were retrieved from the Swift archive. The reduction and analysis of data collected by the Swift X-ray Telescope (XRT) led to 20 detections in the 0.3--10 keV band. We provide details of the X-ray emission in this band for these 20 detections, as well as upper limits for the remaining 11 SMS4 sources. When statistics allowed, we investigated the extent of the X-ray emission, the hardness ratio, and we carried out a spectral analysis. We matched the 20 X-ray detected sources with infrared (AllWISE, CatWISE2020) and optical (GSC 2.3.2, DES DR2) catalogs to establish associations with infrared and optical sources, and compared our results with previously published counterparts in these bands. Requiring a detection in both the infrared and the optical bands to establish a candidate counterpart for our X-ray detections, we obtain reliable counterparts for 18 sources, while the remaining two sources need further investigation to establish firm identifications. We find that ~35% of all the SMS4 sources lie below the lower limit of 10.9 Jy for the flux density at 178 MHz. We present the list of 56 SMS4 sources that in 2022 March remain to be observed in the X-rays with narrow-field instruments.

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