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arXiv 2104.05142astro-ph.HEastro-ph.GA
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发现红移z $\approx5.5$的X射线最亮类星体SRGE J170245 .3+130104

Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx5.5$

G. A. Khorunzhev, A. V. Meshcheryakov, P. S. Medvedev, V. D. Borisov, R. A. Burenin, R. A. Krivonos, R. I. Uklein, E. S. Shablovinskaya, V. L. Afanasyev, S. N. … 展开作者

G. A. Khorunzhev, A. V. Meshcheryakov, P. S. Medvedev, V. D. Borisov, R. A. Burenin, R. A. Krivonos, R. I. Uklein, E. S. Shablovinskaya, V. L. Afanasyev, S. N. Dodonov, R. A. Sunyaev, S. Yu. Sazonov, M. R. Gilfanov

摘要:

SRGE J170245.3+130104是由SRG空间天文台上的eROSITA望远镜于2020年3月13日至15日在其全天X射线调查的第一个半年扫描期间发现的。X射线源的光学对应物在$z\approx5.5$被光度学确定为遥远的类星体候选者。2020年8月/9月在BTA 6米望远镜上使用SCORPIO-II仪器进行的后续光谱观测证实SRGE J170245.3+130104是一个红移z=5.466的遥远类星体。在eROSITA全天空巡天的第一个半年扫描期间,类星体的X射线光度为$3.6^{+2.1}_{-1.5}\times 10^{46}$ erg/s(在2-10 keV能量范围内),而其X射线光谱可以用斜率为$Γ=1.8^{+0.9}_{-0.8}$的幂律来描述。六个月后(2020年9月13日至14日),在eROSITA全天空巡天的第二个半年扫描期间,再次探测到类星体,其X射线光度降低了2倍(在$\approx 1.9σ$置信水平上)。SRGE J170245.3+130104被证明是在$z>5$所有已知的X射线类星体中最明亮的X射线。它也是射电最响亮的遥远类星体之一(射电响度为$R\sim10^3$),这可能意味着它是一个耀变体。在附录中,我们列出了迄今为止在X射线中探测到的所有$z>5$类星体。

英文摘要:

SRGE J170245.3+130104 was discovered by the eROSITA telescope aboard the SRG space observatory on March 13-15, 2020 during the first half-year scan of its all-sky X-ray survey. The optical counterpart of the X-ray source was photometrically identified as a distant quasar candidate at $z\approx5.5$. Follow-up spectroscopic observations, done in August/September 2020 with the SCORPIO-II instrument at the BTA 6-m telescope, confirmed that SRGE J170245.3+130104 is a distant quasar at redshift z=5.466. The X-ray luminosity of the quasar during the first half-year scan of the eROSITA all-sky survey was $3.6^{+2.1}_{-1.5}\times 10^{46}$ erg/s (in the 2-10 keV energy range), whereas its X-ray spectrum could be described by a power law with a slope of $Γ=1.8^{+0.9}_{-0.8}$. Six months later (September 13-14, 2020), during the second half-year scan of the eROSITA all-sky survey, the quasar was detected again and its X-ray luminosity had decreased by a factor of 2 (at the $\approx 1.9σ$ confidence level). The SRGE J170245.3+130104 proves to be the most X-ray luminous among all known X-ray quasars at $z>5$. It is also one of the radio-loudest distant quasars (with radio-loudness $R\sim10^3$), which may imply that it is a blazar. In the Appendix, we present the list of all $z>5$ quasars detected in X-rays to date.

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