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Optical Spectroscopy of the ULX-Associated Nebula MF16
Pavel Abolmasov, S. Fabrika, O. Sholukhova +1
We present the results of optical panoramic and long-slit spectroscopy of the nebula MF16 associated with the Ultraluminous X-ray Source NGC6946 ULX-1. More than 20 new emission li…
Optically Thick Outflows of Supercritical Accretion Discs: Radiative Diffusion Approach
P. Abolmasov, S. Karpov, Taro Kotani
Highly supercritical accretion discs are probable sources of dense optically thick axisymmetric winds. We introduce a new approach based on diffusion approximation radiative transf…
Ultraluminous X-ray Sources and Their Nebulae
Pavel Abolmasov
One of the interesting features of Ultraluminous X-ray sources is that many of them are surrounded by luminous nebulae exhibiting diverse observational properties. In different cas…
Kinematics of the Nebular Complex MH9/10/11 Associated with HoIX X-1
P. Abolmasov, A. V. Moiseev
We report the results of our observations of the nebular complex MH9/10/11, associated with the ULX HoIX X-1, with scanning Fabry-Perot Interferometer. Two regions differing by the…
Optical Spectroscopy of the environment of a ULX in NGC 7331
Pavel K. Abolmasov, Douglas A. Swartz, S. Fabrika +3
Optical photometric and spectroscopic data are presented that show an association of an ultraluminous X-ray source in NGC 7331 with a young star cluster of mass 1.1e5 solar masses…
Observation Campaign of SS 433 in April 2006
T. Kotani, K. Kubota, M. Namiki +19
A radio-IR-optical-X-ray observation campaign of SS 433 has been performed in April 2006, when the jet axis is almost perpendicular to the line of sight. Five flares have been dete…
The supercritical accretion disk in SS433 and ultraluminous X-ray sources
S. Fabrika, P. Abolmasov, S. Karpov
SS433 is the only known persistent supercritical accretor, it may be very important for understanding ultraluminous X-ray sources (ULXs) located in external galaxies. We describe m…
The Optical Counterpart of an Ultraluminous X-ray Source NGC6946 ULX-1
P. Abolmasov, S. Fabrika, O. Sholukhova
We present a study of a peculiar nebula MF16 associated with an Ultraluminous X-ray Source NGC6946 ULX-1. We use integral-field and long-slit spectral data obtained with the 6-m te…
Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
Juri Poutanen, Galina Lipunova, Sergei Fabrika +2
We derive the luminosity-temperature relation for the super-critically accreting black holes (BHs) and compare it to the data on ultraluminous X-ray sources (ULXs). At super-Edding…
Intergal field spectroscopy survey of classical LBV stars in M33
O. Sholukhova, P. Abolmasov, S. Fabrika +2
Five well-known LBV stars in M33 were observed with the Multi-Pupil Fiber Spectrograph (MPFS) on the 6-m Russian telescope. We observed LBVs varA, varB, varC, var2 and var83. In th…
Integral Field Spectroscopy of a peculiar Supernova Remnant MF16 in NGC6946
P. Abolmasov, S. Fabrika, O. Sholukhova +1
We present a study of a peculiar Supernova Remnant MF16, associated with the Ultraluminous X-ray Source (ULX) NGC6946 ULX-1. Observations were taken with the MultiPupil Fiber Spect…
Enigma of ultraluminous X-ray sources may be resolved by 3D-spectroscopy (MPFS data)
S. Fabrika, P. Abolmasov
The ultraluminous X-ray sources (ULXs) were isolated in external galaxies for the last 5 years. Their X-ray luminosities exceed 100-10000 times those of brightest Milky Way black h…
Properties of SS433 and ultraluminous X-ray sources in external galaxies
S. Fabrika, S. Karpov, P. Abolmasov +1
We suggest that the ultraluminous X-ray sources located in external galaxies (ULXs) are supercritical accretion disks like that in SS433, observed close to the disk axis. We estima…
Optical observations of type IIP supernova 2004dj: Evidence for the asymmetry of Ni ejecta
N. N. Chugai, S. N. Fabrika, O. N. Sholukhova +3
The photometric and spectroscopic observations of nearby type IIP supernova 2004dj are presented. The Ni mass estimated from the light curve is . This…
Broad band variability of SS433: Accretion disk at work?
M. Revnivtsev, S. Fabrika, P. Abolmasov +6
We present broad band power spectra of variations of SS433 in radio, optical and X-ray spectral bands. We show that at frequencies lower than 1e-5 Hz the source demonstrates the sa…