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

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Abstract

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
PG1634+706—one of the most luminous (an X-ray luminosity ∼1046 erg s−1) 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 spectrumto be measuredmore 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 ≈ 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.

About the authors

G. S. Uskov

Space Research Institute, Russian Academy of Sciences

Email: uskov@cosmos.ru
Moscow, 117997 Russia

S. Yu. Sazonov

Space Research Institute, Russian Academy of Sciences

Email: uskov@cosmos.ru
Moscow, 117997 Russia

M. R. Gilfanov

Space Research Institute, Russian Academy of Sciences; Max Planck Institut fu¨ r Astrophysik

Email: uskov@cosmos.ru
Moscow, 117997 Russia; Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching, Germany

I. Yu. Lapshov

Space Research Institute, Russian Academy of Sciences

Email: uskov@cosmos.ru
Moscow, 117997 Russia

R. A. Sunyaev

Space Research Institute, Russian Academy of Sciences; Max Planck Institut fu¨ r Astrophysik

Author for correspondence.
Email: uskov@cosmos.ru
Moscow, 117997 Russia; Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching, Germany

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