Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Postnov, Konstantin A"'
Publikováno v:
Astronomy Letters 50, 302-316 (2024)
We consider the final evolutionary stages of a neutron star-black hole pair. According to the current paradigm, such systems eventually coalesce, which in some cases is accompanied by neutron-star tidal disruption. Using analytical methods, we show t
Externí odkaz:
http://arxiv.org/abs/2410.12541
Autor:
Sanjurjo-Ferrín, Graciela, Torrejón, Jose Miguel, Oskinova, Lida, Postnov, Konstantin, Rodes-Roca, Jose Joaquín, Schulz, Norbert, Nowak, Michael
Cen X-3 is a compact, high-mass X-ray binary (HMXRB), likely powered by Roche lobe overflow. We present a phase-resolved X-ray spectral and timing analysis of a target of opportunity \textit{Chandra} observation made during a low-flux to high-flux tr
Externí odkaz:
http://arxiv.org/abs/2409.13320
Autor:
Postnov, Konstantin, Chekh, Ilya
Primordial black holes (PBHs) with log-normal mass spectrum with masses up to $\sim 10^4-10^5 M_\odot$ can be created after QCD phase transition in the early Universe at $z\sim 10^{12}$ by the modified Affleck-Dine baryogenesis. Using a model binary
Externí odkaz:
http://arxiv.org/abs/2407.16373
Interest to astrophysical evidence for primordial black holes (PBHs) formed in the early Universe from initial cosmological perturbations has increased after the discovery of coalescing binary black holes with masses more than dozen solar ones by gra
Externí odkaz:
http://arxiv.org/abs/2309.16246
We present results of long-term photometric monitoring of SS433 which proves a secular evolutionary increase of the orbital period of SS433 at a rate of $(1.14\pm 0.25)\times 10^{-7}$ s~s$^{-1}$. Using a physical model of non-conservative mass transf
Externí odkaz:
http://arxiv.org/abs/2305.07093
Autor:
Bykov, Andrey, Postnov, Konstantin, Bondar, Alexander, Blinnikov, Serguey, Dolgov, Aleksander
A minor population of antistars in galaxies has been predicted by some of non-standard models of baryogenesis and nucleosynthesis in the early Universe, and their presence is not yet excluded by the currently available observations. Detection of an u
Externí odkaz:
http://arxiv.org/abs/2304.04623
Autor:
Postnov, Konstantin, Mitichkin, Nikita
We briefly discuss a possible cosmological implication of the observed binary black hole mergings detected by LIGO-Virgo-Kagra collaboration (GWTC-3 catalogue) for the primordial black hole (PBH) formation in the early Universe. We show that the bump
Externí odkaz:
http://arxiv.org/abs/2302.06981
Autor:
Postnov, Konstantin, Mitichkin, Nikita
We briefly discuss the most prominent results and specific sources detected by gravitational-wave observatories LIGO-Virgo during first three O1-O3 runs, as well as possible astrophysical and cosmological channels of their formation. We show that it
Externí odkaz:
http://arxiv.org/abs/2211.03142
Publikováno v:
Phys. Usp. 66 (12) (2023)
We revisit the modal analysis of small perturbations in Keplerian ideal gas flows leading to magneto-rotational instability (MRI) using the non-local approach. We consider the case of constant vertical background magnetic field, as well as the case o
Externí odkaz:
http://arxiv.org/abs/2210.15337
Her X-1/HZ Her is one of the best studied accreting X-ray pulsars. In addition to the pulsating and orbital periods, the X-ray and optical light curves of the source exhibit an almost periodic 35-day variability caused by a precessing accretion disk.
Externí odkaz:
http://arxiv.org/abs/2204.06408