SDSS J075217.84+193542.2: X-ray weighing of a secondary BH

Titarchuk, L.; Seifina, E.

Авторы: Titarchuk Lev, Seifina Elena
Журнал: Frontiers in Astronomy and Space Sciences
Том: 11
Год издания: 2024
Издательство: Frontiers Media S.A.
Местоположение издательства: Lausanne, Switzerland
Первая страница: 1
Последняя страница: 13
DOI: 10.3389/fspas.2024.1368633
Аннотация: Precise measurements of black hole (BHs) masses are necessary to understand the coevolution of these sources and their host galaxies. Sometimes in the center of a galaxy there is not one, but two BHs. The BH duality of the quasar nucleus SDSS J075217.84+193542.2 (herein SDSS J0752) was recently proposed based on the observed strict periodicity of optical emission from the source. We tested this assumption using X-ray observations with Swift/XRT (2008-2010). We fitted the SDSS J075217 spectrum using a Comptonization model and discovered soft X-ray variability in the 0.3-10keV energy range. We pursued a scenario in which two supermassive BHs at the center of SDSS J0752 form a pair; and the less massive (secondary) BH periodically crosses/punctures the disk around the more massive (primary) BH. We associate these periodic crossings with tidal disruptions of the disk and, as a consequence, with an increase in X-rays seen as a flare in SDSS J0752. During such an X-ray flare event (2008-2010), we discovered a change in the source spectral states and the photon index saturation at the Γ∼3 level with mass accretion rate M˙. For BH mass scaling we used sources: OJ 287, M101 ULX-1 and HLX-1 ESO243-49, as a reference ones, and found that M_SDSS=9×10^7 solar masses, assuming d_SDSS=500 Mpc. Thus, we obtained a lower limit to a BH mass due the unknown inclination. In addition, we used the virial mass of the secondary BH based on Hα-line measurements and we estimated the binary's inclination at SDSS J0752, i=80∘, using a scaling technique.
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