380 citations · 2k across the 39 of their papers we have counts for
5 papers · 2 filters
Masses, Beaming and Eddington Ratios in Ultraluminous X-ray Sources
A. R. King
I suggest that the beaming factor in bright ULXs varies as , where is the Eddington ratio for accretion. This is required by the observed universal…
Stellar disruption by a supermassive black hole: is the light curve really proportional to ?
G. Lodato, A. R. King, J. E. Pringle
In this paper we revisit the arguments for the basis of the time evolution of the flares expected to arise when a star is disrupted by a supermassive black hole. We present a simpl…
On `The spectral and temporal properties of an Ultra--Luminous X-ray source in NGC 6946', by Senorita Devi et al
A. R. King
A recent paper (arXiv:0804.3463) claims that the presence of a soft X-ray component in an X-ray source in NGC 6946 provides strong evidence that its black hole mass is definitely $…
XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?
S. Carpano, B. Altieri, A. R. King +2
Aims. We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart.…
Accretion Rates and Beaming in Ultraluminous X-ray Sources
A. R. King
I show that extreme beaming factors are not needed to explain ULXs as stellar--mass binaries. For neutron star accretors one typically requires , and for black hol…