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Просмотр по автору "Doroshenko V."

Просмотр по автору "Doroshenko V."

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  • A reflection model for the cyclotron lines in the spectra of X-ray pulsars 
    Poutanen J.; Mushtukov A.; Suleimanov V.; Tsygankov S.; Nagirner D.; Doroshenko V.; Lutovinov A. (2013)
    Cyclotron resonance scattering features observed in the spectra of some X-ray pulsars show significant changes of the line energy with the pulsar luminosity. At high luminosities, these variations are often associated with ...
  • AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst 
    Vercellone S.; Romano P.; Piano G.; Vittorini V.; Donnarumma I.; Munar-Adrover P.; Raiteri C.; Villata M.; Verrecchia F.; Lucarelli F.; Pittori C.; Bulgarelli A.; Fioretti V.; Tavani M.; Acosta-Pulido J.; Agudo I.; Arkharov A.; Bach U.; Bachev R.; Borman G.; Butuzova M.; Carnerero M.; Casadio C.; Damljanovic G.; D'Ammando F.; Di Paola A.; Doroshenko V.; Efimova N.; Ehgamberdiev S.; Giroletti M.; Gómez J.; Grishina T.; Järvelä E.; Klimanov S.; Kopatskaya E.; Kurtanidze O.; Lähteenmäki A.; Larionov V.; Larionova L.; Mihov B.; Mirzaqulov D.; Molina S.; Morozova D.; Nazarov S.; Orienti M.; Righini S.; Savchenko S.; Semkov E.; Slavcheva-Mihova L.; Strigachev A.; Tornikoski M.; Troitskaya Y.; Vince O.; Cattaneo P.; Colafrancesco S.; Longo F.; Morselli A.; Paoletti F.; Parmiggiani N. (2019)
    © ESO 2019. Context. The flat-spectrum radio quasar 4C +71.07 is a high-redshift (z = 2.172), γ-loud blazar whose optical emission is dominated by thermal radiation from the accretion disc. Aims. 4C +71.07 has been detected ...
  • An observational argument against accretion in magnetars 
    Doroshenko V.; Santangelo A.; Suleimanov V.F.; Tsygankov S.S. (2020)
    © ESO 2020. The phenomenology of anomalous X-ray pulsars is usually interpreted within the paradigm of very highly magnetized neutron stars, also known as magnetars. According to this paradigm, the persistent emission of ...
  • BeppoSAX observations of GRO J1744-28: Cyclotron line detection and the softening of the burst spectra 
    Doroshenko R.; Santangelo A.; Doroshenko V.; Suleimanov V.; Piraino S. (2015)
    © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We present an analysis of BeppoSAX observations of the unique transient bursting X-ray pulsar GRO J1744-28. The observations ...
  • Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state 
    Tsygankov S.; Rouco Escorial A.; Suleimanov V.; Mushtukov A.; Doroshenko V.; Lutovinov A.; Wijnands R.; Poutanen J. (2019)
    © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low ...
  • Evidence for a binary origin of a central compact object 
    Doroshenko V.; Pühlhofer G.; Kavanagh P.; Santangelo A.; Suleimanov V.; Klochkov D. (2016)
    © 2016 The Authors.Central compact objects (CCOs) are thought to be young thermally emitting isolated neutron stars that were born during the preceding core-collapse supernova explosion. Here, we present evidence that at ...
  • Evidence for the radiation-pressure dominated accretion disk in bursting pulsar GRO J1744-28 using timing analysis 
    Mönkkönen J.; Tsygankov S.; Mushtukov A.; Doroshenko V.; Suleimanov V.; Poutanen J. (2019)
    © ESO 2019. The X-ray pulsar GRO J1744-28 is a unique source that shows both pulsations and type-II X-ray bursts, allowing studies of the interaction of the accretion disk with the magnetosphere at huge mass-accretion rates ...
  • GK Persei and EX Hydrae: Intermediate polars with small magnetospheres 
    Suleimanov V.; Doroshenko V.; Ducci L.; Zhukov G.; Werner K. (2016)
    © ESO, 2016.Observed hard X-ray spectra of intermediate polars are determined mainly by the accretion flow velocity at the white dwarf surface, which is normally close to the free-fall velocity. This allows us to estimate ...
  • Hard X-ray view on intermediate polars in the Gaia era 
    Suleimanov V.; Doroshenko V.; Werner K. (2019)
    © 2018 The Author(s). The hardness of the X-ray spectra of intermediate polars (IPs) is determined mainly by the white dwarf (WD) compactness (mass-radius ratio, MIR) and, thus, hard X-ray spectra can be used to constrain ...
  • INTEGRAL View on cataclysmic variables and symbiotic binaries 
    Lutovinov A.; Suleimanov V.; Manuel Luna G.J.; Sazonov S.; Martino D.d.; Ducci L.; Doroshenko V.; Falanga M. (2020)
    © 2020 Elsevier B.V. Accreting white dwarfs (WDs) constitute a significant fraction of the hard X-ray sources detected by the INTEGRAL observatory. Most of them are magnetic Cataclysmic Variables (CVs) of the intermediate ...
  • Is there a highly magnetized neutron star in GX 301-2? 
    Doroshenko V.; Santangelo A.; Suleimanov V.; Kreykenbohm I.; Staubert R.; Ferrigno C.; Klochkov D. (2010)
    We present the results of an in-depth study of the long-period X-ray pulsar GX 301-2. Using archival data of INTEGRAL, RXTE ASM, and CGRO BATSE, we study the spectral and timing properties of the source. Comparison of our ...
  • Measuring the masses of magnetic white dwarfs: A NuSTAR legacy survey 
    Shaw A.W.; Heinke C.O.; Mukai K.; Tomsick J.A.; Doroshenko V.; Suleimanov V.F.; Buisson D.J.K.; Gandhi P.; Grefenstette B.W.; Hare J.; Jiang J.; Ludlam R.M.; Rana V.; Sivakoff G.R. (2020)
    © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. The hard X-ray spectrum of magnetic cataclysmic variables can be modelled to provide a measurement of white dwarf mass. ...
  • Observations of GRO J1744-28 in quiescence with XMM-Newton 
    Doroshenko V.; Suleimanov V.; Tsygankov S.; Mönkkönen J.; Ji L.; Santangelo A. (2020)
    © ESO 2020. We report on the deep observations of the "bursting pulsar"GRO J1744-28, which were performed with XMM-Newton and aimed to clarify the origin of its X-ray emission in quiescence. We detect the source at a ...
  • On the origin of cyclotron lines in the spectra of X-ray pulsars 
    Mushtukov A.; Poutanen J.; Suleimanov V.; Tsygankov S.; Nagirner D.; Doroshenko V.; Lutovinov A. (2014)
    Cyclotron resonance scattering features are observed in the spectra of some X-ray pulsars and show significant changes in the line energy with the pulsar luminosity. In a case of bright sources, the line centroid energy ...
  • Polarization angle swings in blazars: The case of 3C 279 
    Kiehlmann S.; Savolainen T.; Jorstad S.; Sokolovsky K.; Schinzel F.; Marscher A.; Larionov V.; Agudo I.; Akitaya H.; Benítez E.; Berdyugin A.; Blinov D.; Bochkarev N.; Borman G.; Burenkov A.; Casadio C.; Doroshenko V.; Efimova N.; Fukazawa Y.; Gómez J.; Grishina T.; Hagen-Thorn V.; Heidt J.; Hiriart D.; Itoh R.; Joshi M.; Kawabata K.; Kimeridze G.; Kopatskaya E.; Korobtsev I.; Krajci T.; Kurtanidze O.; Kurtanidze S.; Larionova E.; Larionova L.; Lindfors E.; López J.; McHardy I.; Molina S.; Moritani Y.; Morozova D.; Nazarov S.; Nikolashvili M.; Nilsson K.; Pulatova N.; Reinthal R.; Sadun A.; Sasada M.; Savchenko S.; Sergeev S.; Sigua L.; Smith P.; Sorcia M.; Spiridonova O.; Takaki K.; Takalo L.; Taylor B.; Troitsky I.; Uemura M.; Ugolkova L.; Ui T.; Yoshida M.; Zensus J.; Zhdanova V. (2016)
    © ESO, 2016.Context. Over the past few years, on several occasions, large, continuous rotations of the electric vector position angle (EVPA) of linearly polarized optical emission from blazars have been reported. These ...
  • RT Crucis: A look into the X-ray emission of a peculiar symbiotic star 
    Ducci L.; Doroshenko V.; Suleimanov V.; Nikołajuk M.; Santangelo A.; Ferrigno C. (2016)
    © 2016 ESO.Symbiotic stars are a heterogeneous class of interacting binaries. Among them, RT Cru has been classified as prototype of a subclass that is characterised by hard X-ray spectra that extend past ∼20 keV. We analyse ...
  • Spectral and timing analysis of the bursting pulsar GRO J1744-28 with RXTE observations 
    Ji L.; Santangelo A.; Zhang S.; Doroshenko V.; Suleimanov V.; Ducci L.; Kretschmar P.; Doroshenko R. (2019)
    © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We analysed RXTE/PCA observations of the bursting pulsar GRO J1744-28 during its two outbursts in 1995-1997. We have ...
  • Switches between accretion structures during flares in 4U 1901+03 
    Ji L.; Ducci L.; Santangelo A.; Zhang S.; Suleimanov V.; Tsygankov S.; Doroshenko V.; Nabizadeh A.; Zhang S.N.; Ge M.Y.; Tao L.; Bu Q.C.; Qu J.L.; Lu F.J.; Chen L.; Song L.M.; Li T.P.; Xu Y.P.; Cao X.L.; Chen Y.; Liu C.Z.; Cai C.; Chang Z.; Chen G.; Chen T.X.; Chen Y.B.; Chen Y.P.; Cui W.; Cui W.W.; Deng J.K.; Dong Y.W.; Du Y.Y.; Fu M.X.; Gao G.H.; Gao H.; Gao M.; Gu Y.D.; Guan J.; Guo C.C.; Han D.W.; Huang Y.; Huo J.; Jia S.M.; Jiang L.H.; Jiang W.C.; Jin J.; Jin Y.J.; Kong L.D.; Li B.; Li C.K.; Li G.; Li M.S.; Li W.; Li X.; Li X.B.; Li X.F.; Li Y.G.; Li Z.W.; Liang X.H.; Liao J.Y.; Liu B.S.; Liu G.Q.; Liu H.X.; Liu H.W.; Liu X.J.; Liu Y.N.; Lu B.; Lu X.F.; Luo Q.; Luo T.; Ma X.; Meng B.; Nang Y.; Nie J.Y.; Ou G.; Sai N.; Shang R.C.; Song X.Y.; Sun L.; Tan Y.; Tuo Y.L.; Wang C.; Wang G.F.; Wang J.; Wang P.J.; Wang W.S.; Wang Y.S.; Wen X.Y.; Wu B.Y.; Wu B.B.; Wu M.; Xiao G.C.; Xiao S.; Xiong S.L.; Xu H.; Yang J.W.; Yang S.; Yang Y.J.; Yi Q.B. (2021)
    We report on our analysis of the 2019 outburst of the X-ray accreting pulsar 4U 1901+03 observed with Insight-HXMT and NICER. Both spectra and pulse profiles evolve significantly in the decaying phase of the outburst. ...
  • The beamed jet and quasar core of the distant blazar 4C 71.07 
    Raiteri C.; Villata M.; Carnerero M.; Acosta-Pulido J.; Mirzaqulov D.; Larionov V.; Romano P.; Vercellone S.; Agudo I.; Arkharov A.; Bach U.; Bachev R.; Baitieri S.; Borman G.; Boschin W.; Bozhilov V.; Butuzova M.; Calcidese P.; Carosati D.; Casadio C.; Chen W.; Damljanovic G.; Di Paola A.; Doroshenko V.; Efimova N.; Ehgamberdiev S.; Giroletti M.; Gómez J.; Grishina T.; Ibryamov S.; Jermak H.; Jorstad S.; Kimeridze G.; Klimanov S.; Kopatskaya E.; Kurtanidze O.; Kurtanidze S.; Lähteenmäki A.; Larionova E.; Marscher A.; Mihov B.; Minev M.; Molina S.; Moody J.; Morozova D.; Nazarov S.; Nikiforova A.; Nikolashvili M.; Ovcharov E.; Peneva S.; Righini S.; Rizzi N.; Sadun A.; Samal M.; Savchenko S.; Semkov E.; Sigua L.; Slavcheva-Mihova L.; Steele I.; Strigachev A.; Tornikoski M.; Troitskaya Y.; Troitsky I.; Vince O. (2019)
    © 2019 The Author(s). The object 4C 71.07 is a high-redshift blazar whose spectral energy distribution shows a prominent big blue bump and a strong Compton dominance. We present the results of a 2- yr multiwavelength ...
  • Time domain astronomy with the THESEUS satellite 
    Mereghetti S.; Balman S.; Caballero-Garcia M.; Del Santo M.; Doroshenko V.; Erkut M.H.; Hanlon L.; Hoeflich P.; Markowitz A.; Osborne J.P.; Pian E.; Rivera Sandoval L.; Webb N.; Amati L.; Ambrosi E.; Beardmore A.P.; Blain A.; Bozzo E.; Burderi L.; Campana S.; Casella P.; D’Aí A.; D’Ammando F.; De Colle F.; Della Valle M.; De Martino D.; Di Salvo T.; Doyle M.; Esposito P.; Frontera F.; Gandhi P.; Ghisellini G.; Gotz D.; Grinberg V.; Guidorzi C.; Hudec R.; Iaria R.; Izzo L.; Jaisawal G.K.; Jonker P.G.; Kong A.K.H.; Krumpe M.; Kumar P.; Manousakis A.; Marino A.; Martin-Carrillo A.; Mignani R.; Miniutti G.; Mundell C.G.; Mukai K.; Nucita A.A.; O’Brien P.T.; Orlandini M.; Orio M.; Palazzi E.; Papitto A.; Pintore F.; Piranomonte S.; Porquet D.; Ricci C.; Riggio A.; Rigoselli M.; Rodriguez J.; Saha T.; Sanna A.; Santangelo A.; Saxton R.; Sidoli L.; Stiele H.; Tagliaferri G.; Tavecchio F.; Tiengo A.; Tsygankov S.; Turriziani S.; Wijnands R.; Zane S.; Zhang B. (2021)
    THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray ...

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