Catalog of 3 < z < 5.5 Quasar Candidates Selected among XMM-Newton Sources and Its Spectroscopic Verification

Frontiers in Astronomy and Space Sciences

Khorunzhev, Georgii¹  Sazonov, Sergey¹  Burenin, Rodion¹  Eselevich, Maxim² 

[1] High Energy Astrophysics, Space Research Institute, Russian Academy of Sciences, Russia;Laboratory of Infrared Methods in Astrophysics, Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Russia

关键词: active galactic nuclei;    quasars;    X-ray surveys;    Photometric redshifts;    spectroscopy;    xmm-newton;    SDSS;   

DOI  :  10.3389/fspas.2017.00037

学科分类：空间科学

来源: Frontiers

【 摘 要 】

We have compiled a catalog of 903 quasar candidates (including known quasars) at 3$<$z$<$5.5 selected among X-ray sources from the XMM-Newton serendipitous survey (3XMM-DR4 catalog). We used photometric SDSS, 2MASS and WISE data to select the objects. The surface number density of objects in our sample exceeds that in the SDSS spectroscopic quasar sample at the same redshifts by a factor of 1.5. We have performed spectroscopic observations of a subsample of new quasar candidates using a new low- and medium-resolution spectrograph at the 1.6-m AZT-33IK telescope (Mondy, Russia) and demonstrated that the purity of these candidates is about 65%. We have discovered one of the most distant (z=5.08) X-ray selected quasars.

【 授权许可】

CC BY