Search Publications
Hard Spectra of X-ray Pulsars from INTEGRAL Data
Sunyaev, R. A.; Tsygankov, S. S.; Lutovinov, A. A. +1 more
We present spectra for 34 accretion-powers X-ray pulsars and one millisecond pulsar that were within the field of view of the INTEGRAL observatory over two years (December 2002 January 2005) of its in-orbit operation and that were detected by its instruments at a statistically significant level (> 8σ in the energy range 18 60 keV). There are se…
Observations of the Transient X-ray Pulsar KS 1947+300 by the INTEGRAL and RXTE Observatories
Tsygankov, S. S.; Lutovinov, A. A.
We analyze the observations of the X-ray pulsar KS 1947+300 performed by the INTEGRAL and RXTE observatories over a wide (3 100 keV) X-ray energy range. The shape of the pulse profile was found to depend on the luminosity of the source. Based on the model of a magnetized neutron star, we study the characteristics of the pulsar using the change in …
Outburst of the X-ray Transient SAX J1818.6-1703 Detected by the INTEGRAL Observatory in September 2003
Sunyaev, R. A.; Grebenev, S. A.
During the observation of the Galactic-center field by the INTEGRAL observatory on September 9, 2003, the IBIS/ISGRI gamma-ray telescope detected a short (several-hours-long) intense (∼380 mCrab at the peak) outburst of hard radiation from the X-ray transient SAX J1818.6-1703. Previously, this source was observed only once in 1998 during a similar…
Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4
Tsygankov, S. S.; Lutovinov, A. A.
We analyze the observations of the X-ray pulsar LMCX-4 performed by the INTEGRAL observatory and the All-Sky Monitor (ASM) of the RXTE observatory over a wide energy range. The observed hard X-ray flux from the source is shown to change by more than a factor of 50 (from ∼70 mCrab in the high state to ∼1.3 mCrab in the low state) on the time scale …
Chemically Decoupled Nuclei in Five Lenticular Galaxies from SAURON Data
Sil'Chenko, O. K.
We analyze data from the SAURON integral-field spectrograph of the William Herschel 4-m telescope for five lenticular galaxies in which we previously found chemically decoupled nuclei from observations with the Multipupil Fiber Spectrograph of the 6-m Special Astrophysical Observatory telescope. In a larger field of view, we confirmed the presence…
Constraints on the Luminosity of the Central Source in SNR 1987A
Gilfanov, M. R.; Sunyaev, R. A.; Lutovinov, A. A. +1 more
We obtained constraints on the luminosity of the central source in SNR 1987 A using XMM-Newton and INTEGRAL data. XMM-Newton yields an upper limit on the SNR luminosity in the 2 10 keV energy band, L X ≲ 5 × 1034 erg s-1. Since the optical depth of the envelope is still large in the XMM-Newton energy band, this constraint carries no useful informa…
New Observations of the Pulsar Wind Nebula in the Supernova Remnant CTB 80
Moiseev, A. V.; Blinnikov, S. I.; Lozinskaya, T. A. +1 more
We investigated the kinematics of the pulsar wind nebula (PWN) in the old supernova remnant CTB 80 using the Fabry-Perot interferometer of the 6-m Special Astrophysical Observatory telescope. In addition to the previously known expansion of the system of bright filaments with a velocity of 100 200 km s-1, we detected weak high-velocity features in…
Observations of the X-ray Burster MX 0836-42 by the INTEGRAL and RXTE Orbiting Observatories
Sunyaev, R. A.; Lutovinov, A. A.; Grebenev, S. A. +1 more
We present the results of our study of the emission from the transient burster MX 0836-42 using its observations by the INTEGRAL and RXTE X-ray and gamma-ray observatories in the period 2003 2004. The source’s broadband X-ray spectrum in the energy range 3 120 keV has been obtained and investigated for the first time. We have detected 39 X-ray bur…