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Cygnus X-3 IR spectra
We present four epochs, A, B, C and D, of resolution ({lambda}/{delta}{lambda}) = 1200, 2.12 micron spectroscopy of the peculiar X-ray binary Cygnus X-3. About a half dozen... -
X-ray and radio sources in binaries
The goal of the present study was to compile complete list of binaries discovered at non-optical bands: X-ray binaries (XRB) and radio pulsars in binaries. Due to the lack of a... -
V1357 Cyg spectroscopic monitoring in 2002-04
The results of Cyg X-1 = HDE 226868/V1357 Cyg optical spectral monitoring in 2002-2004 are discussed. Spectral observations were carried out on Peak Terskol Observatory... -
UBVR and spectroscopic observations of CI Cam
Photoelectric (UBVR) observations in 1998-2001 and medium-resolution spectroscopy obtained in the SAO in the same period for the B[e]/X-ray transient CI Cam display cyclic... -
UBV photometry of X-ray binary HZ Her
We present UBV photoelectric and CCD observations of HZ Her/Her X-1 system near its primary minimum in 1999, when the object was in anomalous low X-ray state, together with UBV... -
Radio emission of SS433
Two daily sets monitoring data of the galactic X-ray binary SS 433 (V1343 Aql) obtained on the RATAN-600 radio telescope (117 days in 1997 and 120 days in 1999) show variations... -
Variability of Cyg X-1 in 1994-1998
Photoelectric UBVR photometry of Cyg X-1 obtained during the coordinated international campaign 'Optical Monitoring of Unique Astrophysical objects', carried out in... -
AstroSat/UVIT and Chandra X-ray sources in M31
An ultraviolet (UV) survey of M31 has been carried out during 2017-19 with the Ultra-Violet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we match... -
Chandra observations of SINGS galaxies
We present new Chandra constraints on the X-ray luminosity functions (XLFs) of X-ray binary (XRB) populations, as well as their scaling relations, for a sample of 38 nearby... -
Deep Chandra observations of NGC 4649. I.
We present the X-ray source catalog for the Chandra monitoring observations of the elliptical galaxy, NGC 4649 (M60). The galaxy has been observed with Chandra ACIS-S3 in six... -
7yr MAXI/GSC X-ray source cat. (3MAXI), |b|<10{deg}
We present the first MAXI/GSC X-ray source catalog in the low-Galactic-latitude sky |b|<10{deg} outside the Galactic center region (|b|<5{deg}, l<30{deg}, and... -
WATCHDOG: an all-sky database of Galactic BHXBs
With the advent of more sensitive all-sky instruments, the transient universe is being probed in greater depth than ever before. Taking advantage of available resources, we have... -
The Galactic Bulge Survey: X-ray observations
We introduce the Galactic Bulge Survey (GBS) and we provide the Chandra source list for the region that has been observed to date. Among the goals of the GBS are constraining... -
M33 Chandra ACIS survey: final catalog
This study presents the final source catalog of the Chandra ACIS Survey of M33 (ChASeM33). With a total exposure time of 1.4Ms, ChASeM33 covers ~70% of the D_25_ isophote... -
X-ray variability in NGC 6946, NGC 4485/90
We analyze data from five Chandra observations of the spiral galaxy NGC 6946 and from three Chandra observations of the irregular/spiral interacting galaxy pair NGC 4485/4490,... -
The X-ray binary population in M33. I
In this paper we present the source list for three Chandra observations of the Local Group galaxy M33. The observations are centered on the nucleus and on the star-forming... -
Ultraluminous X-ray sources in nearby galaxies
X-ray observations have revealed in other galaxies a class of extranuclear X-ray point sources with X-ray luminosities of 10^39^-10^41^ergs/s, exceeding the Eddington luminosity... -
Classification of Chandra sources
The rapid increase in serendipitous X-ray source detections requires the development of novel approaches to efficiently explore the nature of X-ray sources. If even a fraction... -
The redshift evolution of ULXs out to z~0.5
Ultraluminous X-ray sources (ULXs) are thought to be powerful X-ray binaries (XRBs) and may contribute significantly to the redshift-dependent X-ray emission from star-forming... -
Monitoring of the neutron star XRB Centaurus X-4
We report on a long-term optical monitoring of the neutron star X-ray binary Centaurus X-4 performed during the last 13.5yr. This source has been in quiescence since its...
