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The X-ray polarimetry view of the accreting pulsar Cen X-3
Sergey S. Tsygankov, Victor Doroshenko, Juri Poutanen +95
Cen X-3 is the first X-ray pulsar discovered 50 years ago. Radiation from such objects is expected to be highly polarized due to birefringence of plasma and vacuum associated with…
GBT/MUSTANG-2 9" resolution imaging of the SZ effect in MS0735.6+7421: Confirmation of the SZ Cavities through direct imaging
John Orlowski-Scherer, Saianeesh K. Haridas, Luca Di Mascolo +14
Mechanical feedback from active galactic nuclei (AGN) is thought to be the dominant feedback mechanism quenching cooling flows and star formation in galaxy cluster cores. However,…
Determination of X-ray pulsar geometry with IXPE polarimetry
Victor Doroshenko, Juri Poutanen, Sergey S. Tsygankov +91
Using observations of X-ray pulsar Her X-1 by the Imaging X-ray Polarimetry Explorer, we report on a highly significant () detection of the polarization signal from an accret…
The X-ray and Radio Loud Fast Blue Optical Transient AT2020mrf: Implications for an Emerging Class of Engine-Driven Massive Star Explosions
Yuhan Yao, Anna Y. Q. Ho, Pavel Medvedev +9
We present AT2020mrf (SRGe J154754.2443907), an extra-galactic () fast blue optical transient (FBOT) with a rise time of days and a peak luminosit…
SRG/eROSITA view of X-ray reflection in the Central Molecular Zone: a snapshot in September-October 2019
Ildar Khabibullin, Eugene Churazov, Rashid Sunyaev
X-ray reflection off dense molecular clouds in the Galactic Centre region has established itself as a powerful probe for the past activity record of the supermassive black hole Sgr…
Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino
Simeon Reusch, Robert Stein, Marek Kowalski +46
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present A…
Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey
I. Zaznobin, S. Sazonov, R. Burenin +6
We report the discovery of three previously unknown cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were…
Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z
G. A. Khorunzhev, A. V. Meshcheryakov, P. S. Medvedev +10
SRGE J170245.3+130104 was discovered by the eROSITA telescope aboard the SRG space observatory on March 13-15, 2020 during the first half-year scan of its all-sky X-ray survey. The…
The SRG X-ray orbital observatory, its telescopes and first scientific results
R. Sunyaev, V. Arefiev, V. Babyshkin +39
The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to the L…
15 years of Galactic surveys and hard X-ray Background measurements
Roman A. Krivonos, Antony J. Bird, Eugene M. Churazov +15
The INTEGRAL hard X-ray surveys have proven to be of fundamental importance. INTEGRAL has mapped the Galactic plane with its large field of view and excellent sensitivity. Such har…
Tempestuous life beyond R_500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection
E. Churazov, I. Khabibullin, N. Lyskova +2
This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in course of the Calibration and Performance Verification observations.…
XMM-Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1+544716 at redshift z=6.18
P. Medvedev, M. Gilfanov, S. Sazonov +2
We present results from a 20 ks XMM-Newton DDT observation of the radio-load quasar CFHQS J142952+544717 at z=6.18, whose extreme X-ray luminosity was recently revealed by the SRG/…
Observing imprints of black hole event horizon on X-ray spectra
Srimanta Banerjee, Marat Gilfanov, Sudip Bhattacharyya +1
A fundamental difference between a neutron star (NS) and a black hole (BH) is the absence of a physical surface in the latter. For this reason, any remaining kinetic energy of the…
INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
S. Mereghetti, V. Savchenko, C. Ferrigno +23
We report on INTEGRAL observations of the soft -ray repeater SGR 1935+2154 performed between 2020 April 28 and May 3. Several short bursts with fluence of …
The intermediate nebular phase of SN 2014J: onset of clumping as the source of recombination
P. A. Mazzali, I. Bikmaev, R. Sunyaev +6
At the age of about 1 year, the spectra of most Type Ia supernovae are dominated by strong forbidden nebular emission lines of FeII and FeIII. Later observations (at about 2 years)…
Impact of intrinsic polarisation of Sgr A* historical flares on (polarisation) properties of their X-ray echoes
Ildar Khabibullin, Eugene Churazov, Rashid Sunyaev
Reflection of X-ray emission on molecular clouds in the inner 100 pc of our Galaxy reveals that, despite being extremely quiet at the moment, our supermassive black hole Sgr…
Does Nature use neutral beams for interstellar plasma heating around compact objects?
Eugene Churazov, Ildar Khabibullin, Rashid Sunyaev
A neutral beam injection technique is employed in all major TOKAMAK facilities for heating of magnetically confined plasma. The question then arises, whether a similar mechanism mi…
INTEGRAL observations of GW170104
V. Savchenko, C. Ferrigno, E. Bozzo +16
We used data from the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) to set upper-limits on the -ray and hard X-ray prompt emission associated with the gravitational…
Studying the ICM in clusters of galaxies via surface brightness fluctuations of the cosmic X-ray background
Alexander Kolodzig, Marat Gilfanov, Gert Hütsi +1
We study the surface brightness fluctuations of the cosmic X-ray background (CXB) using Chandra data of XBOOTES. After masking out resolved sources we compute the power spectrum of…
Can Sgr A* flares reveal the molecular gas density PDF?
E. Churazov, I. Khabibullin, R. Sunyaev +1
Illumination of dense gas in the Central Molecular Zone (CMZ) by powerful X-ray flares from Sgr A* leads to prominent structures in the reflected emission that can be observed long…
New hard X-ray sources discovered in the ongoing INTEGRAL Galactic Plane survey after 14 years of observations
Roman Krivonos, Sergey Tsygankov, Ilya Mereminskiy +3
The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) continues to successfully work in orbit after its launch in 2002. The mission provides the deepest ever survey of har…
Polarization and long-term variability of Sgr A* X-ray echo
E. Churazov, I. Khabibullin, G. Ponti +1
We use a model of the molecular gas distribution within ~100 pc from the center of the Milky Way (Kruijssen, Dale & Longmore) to simulate time evolution and polarization properties…
Not that long time ago in the nearest galaxy: 3D slice of molecular gas revealed by a 110 years old flare of Sgr A*
E. Churazov, I. Khabibullin, R. Sunyaev +1
A powerful outburst of X-ray radiation from the supermassive black hole Sgr A* at the center of the Milky Way is believed to be responsible for the illumination of molecular clouds…
Can AGN and galaxy clusters explain the surface brightness fluctuations of the cosmic X-ray background?
Alexander Kolodzig, Marat Gilfanov, Gert Hütsi +1
Fluctuations of the surface brightness of cosmic X-ray background (CXB) carry unique information about faint and low luminosity source populations, which is inaccessible for conven…