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A universal 21 cm signature of growing massive black holes in the early Universe
Sergey Sazonov, Ildar Khabibullin
There is a hope that looking into the early Universe with next-generation telescopes, one will be able to observe the early accretion growth of supermassive black holes (BHs) when…
X-ray emission from warm-hot intergalactic medium: the role of resonantly scattered cosmic X-ray background
Ildar Khabibullin, Eugene Churazov
We revisit calculations of the X-ray emission from warm-hot intergalactic medium (WHIM) with particular focus on contribution from the resonantly scattered cosmic X-ray background…
An upper limit on nickel overabundance in the supercritical accretion disk wind of SS 433 from X-ray spectroscopy
P. Medvedev, I. Khabibullin, S. Sazonov +2
We take advantage of a long (with a total exposure time of 120 ks) X-ray observation of the unique Galactic microquasar SS 433, carried out with the XMM-Newton space observatory, t…
Polarization of MeV gamma-rays and 511 keV line shape as probes of SNIa asymmetry and magnetic field
Eugene Churazov, Ildar Khabibullin
We discuss gamma-ray signatures associated with an asymmetric explosion and transport of positrons in SN Ia ejecta. In particular, Compton scattering of gamma-ray line photons can…