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arXiv 2403.17865astro-ph.HEastro-ph.GA
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基于SRG和XMM-Newton数据研究z = 1.337处明亮类星体PG 1634+706的X射线性质

X-ray Properties of the Luminous Quasar PG 1634+706 at z = 1.337 from SRG and XMM-Newton Data

Grigory Uskov, Sergey Sazonov, Marat Gilfanov, Igor Lapshov, Rashid Sunyaev

AI总结:

本文基于SRG和XMM-Newton观测数据,研究了明亮类星体PG 1634+706的X射线性质,发现其宽能谱符合幂律连续谱加铁发射线的双成分模型,且在17年间光度变化不超过2.5倍。

摘要:

2019年秋季,在SRG天文台的在轨校准阶段,其搭载的eROSITA和Mikhail Pavlinsky ART-XC望远镜对PG 1634+706进行了一系列观测,该类星体是z<2时宇宙中最明亮(X射线光度约10^46 erg/s)的类星体之一。大约在同一时期,XMM-Newton天文台也观测了该类星体。尽管该天体此前已被反复进行X射线研究,但新观测使其能够在1-30 keV(类星体静止参考系)的宽范围内更精确地测量其能谱。其光谱可由双成分模型描述,该模型由斜率Γ≈1.9的幂律连续谱和能量约6.4 keV处的展宽铁发射线组成。此外还研究了该类星体的X射线变异性。在几小时的时间尺度上(此处及下文均指源静止参考系),X射线光度未表现出具有统计显著性的变异性。然而,在2019年秋季的观测之间,其光度发生了显著变化,在25天内增加了约1.5倍。将SRG和XMM-Newton的新测量结果与其他X射线天文台以往的测量结果进行比较表明,在类星体PG 1634+706长达17年的观测历史中,其X射线光度的变化不超过2.5倍,且在几周和几年的时间尺度上的变化幅度相当。

英文摘要:

In the fall of 2019, during the in-flight calibration phase of the SRG observatory, the onboard eROSITA and Mikhail Pavlinsky ART-XC telescopes carried out a series of observations of PG 1634+706 - one of the most luminous (an X-ray luminosity $\sim 10^{46}$ erg/s) quasars in the Universe at $z<2$. Approximately at the same dates this quasar was also observed by the XMM-Newton observatory. Although the object had already been repeatedly studied in X-rays previously, its new observations allowed its energy spectrum to be measured more accurately in the wide range $1-30$ keV (in the quasar rest frame). Its spectrum can be described by a two-component model that consists of a power-law continuum with a slope $Γ\approx 1.9$ and a broadened iron emission line at an energy of about 6.4 keV. The X-ray variability of the quasar was also investigated. On time scales of the order of several hours (here and below, in the source rest frame) the X-ray luminosity does not exhibit a statistically significant variability. However, it changed noticeably from observation to observation in the fall of 2019, having increased approximately by a factor of 1.5 in 25 days. A comparison of the new SRG and XMM-Newton measurements with the previous measurements of other X-ray observatories has shown that in the entire 17-year history of observations of the quasar PG 1634+706 its X-ray luminosity has varied by no more than a factor of 2.5, while the variations on time scales of several weeks and several years are comparable in amplitude.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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