SMS4样本的Swift X射线观测 - III：对之前未检测到的源的更深入研究
A Swift X-ray view of the SMS4 sample - III: Deeper insight into previously undetected sources
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中文总结 AI 辅助
本研究通过Swift XRT对SMS4样本的5个射电源开展额外观测，探测到此前未被eROSITA-DE DR1发现的2个源，更新了X射线信息并确认或补充了对应体。
中文摘要 AI 辅助
我们利用2026年2月期间通过Neil Gehrels Swift天文台搭载的X射线望远镜（XRT，以下简称Swift）开展的额外观测，更新了Maselli等人（2024）给出的SMS4星表中5个明亮射电源的X射线信息。MRC B1754-597的X射线辐射此前仅基于eROSITA-DE DR1星表的数据，如今也被Swift探测到，这使得位置不确定度更为精确。得益于Swift约7千秒的额外曝光，我们现在能够探测到MRC B1817-391，该源在eROSITA-DE DR1中未发现X射线对应体。另一个在eROSITA-DE DR1星表中未被探测到、且在2025年之前未被Swift观测过的源是MRC B1827-360：通过约6千秒的X射线观测，该源被成功探测到。最后，基于约8千秒的额外曝光，我们探测到MRC B2032-350的X射线辐射，该源位于DR1覆盖区之外。相比之下，约2千秒的额外曝光仅能给出MRC B1814-519的X射线辐射上限。对4个已探测到的X射线源的延展度和硬度比分析表明，存在星系团核心或热星系银晕所预期的软弥散X射线辐射。利用X射线探测的位置不确定度来约束低能对应体的搜索，我们为MRC B1817-391提供了一个新的红外/光学对应体，并确认了其余三个源在文献中已报道的对应体。
英文摘要
We update the X-ray information given in Maselli et al. (2024) for five bright radio sources in the SMS4 catalog, thanks to additional observations with the X-Ray Telescope (XRT) on board the Neil Gehrels Swift Observatory (hereafter Swift) carried out through February 2026. X-ray emission from MRC B1754-597, previously based only on data from the eROSITA-DE DR1 catalogs, is now detected also by Swift, which yields a more precise positional uncertainty. Thanks to ~7 ks of additional exposure with Swift we are now able to detect MRC B1817-391, a source for which no X-ray counterpart is found in eROSITA-DE DR1. Another source that is not detected in the eROSITA-DE DR1 catalogs, and that was not observed by Swift earlier than 2025, is MRC B1827-360: with a ~6 ks X-ray observation, the source is detected. Finally, based on ~8 ks of additional exposure, we detect X-ray emission for MRC B2032-350, a source that lies out of the DR1 footprint. In contrast, additional exposure (~2 ks) just gives an upper limit on the X-ray emission of MRC B1814-519. The analysis of the extent and the hardness ratio of the four detected X-ray sources suggests the presence of soft, diffuse X-ray emission as expected from galaxy group cores or hot galaxy coronae. Using the positional uncertainty of the X-ray detections to constrain the search for counterparts at lower energies, we provide a new infrared/optical counterpart for MRC B1817-391 and confirm the counterparts previously reported in the literature for the three remaining sources.
发表机构
- INAF-Osservatorio Astronomico di Roma（意大利国家天体物理研究所罗马天文台）
- ASI Space Science Data Center (SSDC)（意大利航天局空间科学数据中心）
- Harvard-Smithsonian Center for Astrophysics（哈佛-史密森尼天体物理中心）
机构由 AI 辅助整理，请以论文原文为准。
