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9 papers · 2 filters
Spectral formation in a radiative shock: application to anomalous X-ray pulsars and soft gamma-ray repeaters
N. D. Kylafis, J. E. Truemper, U. Ertan
In the fallback disk model for the persistent emission of Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), the hard X-ray emission arises from bulk- and thermal…
Optical spectra of 5 new Be/X-ray Binaries in the Small Magellanic Cloud and the link of the supergiant B[e] star LHA 115-S 18 with an X-ray source
Grigoris Maravelias, Andreas Zezas, Vallia Antoniou +1
The Small Magellanic Cloud (SMC) is well known to harbor a large number of High-Mass X-ray Binaries (HMXBs). The identification of their optical counterparts provides information o…
Connecting radio variability to the characteristics of gamma-ray blazars
Joseph L. Richards, Talvikki Hovatta, Walter Max-Moerbeck +3
We present results from four years of twice-weekly 15 GHz radio monitoring of about 1500 blazars with the Owens Valley Radio Observatory 40 m telescope. Using the intrinsic modulat…
Disc-loss episode in the Be shell optical counterpart to the high-mass X-ray binary IGR J21343+4738
P. Reig, A. Zezas
The main goal of this work is to determine the properties of the optical counterpart to the INTEGRAL source IGR J21343+4738, and study its long-term optical variability. We present…
The RoboPol optical polarization survey of gamma-ray - loud blazars
V. Pavlidou, E. Angelakis, I. Myserlis +23
We present first results from RoboPol, a novel-design optical polarimeter operating at the Skinakas Observatory in Crete. The data, taken during the May - June 2013 commissioning o…
Evidence for a change in the radiation mechanism in the hard state of GRO J1655-40. Hysteresis in the broad-band noise components
P. Reig, I. E. Papadakis, M. A. Sobolewska +1
We have analysed RXTE archival data to study the aperiodic variability of the black-hole binary GRO J1655-40 during the hard state of the 2005 outburst. We computed the 0.008-64 Hz…