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13 papers · 2 filters
Investigating Variability of Quiescent Neutron Stars in the Globular Clusters NGC 6440 and Terzan 5
A. R. Walsh, E. M. Cackett, F. Bernardini
The quiescent spectrum of neutron star low-mass X-ray binaries typically consists of two components - a thermal component associated with emission from the neutron star surface, an…
X-ray Spectral and Variability Properties of Low-Mass AGN
R. M. Ludlam, E. M. Cackett, K. Gultekin +3
We study the X-ray properties of a sample of 14 optically-selected low-mass AGN whose masses lie within the range 1E5 -2E6 M(solar) with XMM-Newton. Only six of these low-mass AGN…
Supergiant fast X-ray transients as an under-luminous class of supergiant X-ray binaries
E. Bozzo, P. Romano, L. Ducci +2
The usage of cumulative luminosity distributions, constructed thanks to the long-term observations available through wide field hard X-ray imagers, has been recently exploited to s…
Swift J2218.4+1925: a new hard X-ray selected Polar observed with XMM-Newton
Federico Bernardini, Domitilla de Martino, Koji Mukai +1
Swift J2218.4+1925, a hard X-ray source detected by Swift BAT, has been proposed as a candidate magnetic cataclysmic variable of the polar type from optical spectroscopy. Using XMM…
The changing X-ray time lag in MCG-6-30-15
E. Kara, A. C. Fabian, A. Marinucci +6
MCG-6-30-15 is one of the most observed Narrow Line Seyfert 1 galaxies in the X-ray band. In this paper we examine the X-ray time lags in this source using a total of 600 ks in obs…
A strongly heated neutron star in the transient Z source MAXI J0556-332
Jeroen Homan, Joel K. Fridriksson, Rudy Wijnands +5
We present Chandra, XMM-Newton, and Swift observations of the quiescent neutron star in the transient low-mass X-ray binary MAXI J0556-332. Observations of the source made during o…