91 citations · 615 across the 31 of their papers we have counts for
33 papers
X-ray spectral scaling of black hole mass in quasi-periodic eruptive source RX J1301.9+2747
Lev Titarchuk, Elena Seifina, Vadim Arefiev +2
We present a spectral and timing analysis of X-ray emission from the actively accreting supermassive black hole (SMBH) in RX~J1301.9+2747 with prominent quasi-periodic eruptions (Q…
Energy-independent X-Ray Polarization in 4U 1630-47 in the Intermediate State from Spectroscopy and Polarimetry
Elena Seifina, Lev Titarchuk, Paolo Soffitta +4
The IXPE mission enabled measurements of X-ray polarization in accreting binaries. The dependence of the X-ray polarization degree on the binary inclination and the optical depth o…
Linear Polarization in a Black Hole, 4U~1957+115 and its X-ray Spectral Analysis
Lev Titarchuk, Elena Seifina, Paolo Soffiitta +1
We present a new spectro-polarimetric method for estimation of the inclination of X-ray binaries using the linear polarization (LP) value in black hole (BH) sources, based on the e…
X-ray linear polarization prediction in Black-Hole binaries and Active Galactic Nuclei and its measurements by IXPE
Lev Titarchuk, Paolo Soffitta, Elena Seifina +3
We present a theoretical framework for the formation of X-ray linear polarization in black hole (BH) source. The X-ray linear polarization originates from up-scatterings of initial…
Changing Look AGN: An X-ray Look
Lev Titarchuk, Elena Seifina, Yegor Mishin
To date, a number of changing-look (CL) active galactic nuclei (AGNs) are known. We studied, in detail what happens to the X-ray spectrum during the CL events using the example of…
SDSS~J075217.84+193542.2: X-ray weighing of a secondary BH
Lev Titarchuk, Elena Seifina
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 n…