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5 papers · 1 filter
The First Spectroscopically Resolved Sub-parsec Orbit of a Supermassive Binary Black Hole
E. Bon, P. Jovanović, P. Marziani +6
One of the most intriguing scenarios proposed to explain how active galactic nuclei are triggered involves the existence of a supermassive binary black hole system in their cores.…
Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state
M. Ackermann, M. Ajello, J. Ballet +208
The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuou…
AGILE detection of extreme gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis
F. D'Ammando, C. M. Raiteri, M. Villata +112
We report on the extreme gamma-ray activity from the FSRQ PKS 1510-089 observed by AGILE in March 2009. In the same period a radio-to-optical monitoring of the source was provided…
Cooling rates of neutron stars and the young neutron star in the Cassiopeia A supernova remnant
Dmitry G. Yakovlev, Wynn C. G. Ho, Peter S. Shternin +2
We explore the thermal state of the neutron star in the Cassiopeia A supernova remnant using the recent result of Ho & Heinke (Nature, 462, 71 (2009)) that the thermal radiation of…
Radiative properties of highly magnetized isolated neutron star surfaces and approximate treatment of absorption features in their spectra
V. Suleimanov, V. V. Hambaryan, A. Y. Potekhin +3
In the X-ray spectra of most X-ray dim isolated neutron stars (XDINSs) absorption features with equivalent widths (EWs) of 50 -- 200 eV are observed. We theoretically investigate d…