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4 papers
INTEGRAL broadband spectroscopy of Vela X-1
P. Kretschmar, R. Staubert, I. Kreykenbohm +11
The wind-accreting X-ray binary pulsar and cyclotron line source Vela X-1 has been observed extensively during INTEGRAL Core Program observations of the Vela region in June-July an…
XMM-Newton Observations of the Be/X-ray transient A0538-66 in quiescence
P. Kretschmar, J. Wilms, R. Staubert +2
We present XMM-Newton observations of the recurrent Be/X-ray transient A0538-66, situated in the Large Magellanic Cloud, in the quiescent state. Despite a very low luminosity state…
UV to X-ray Spectra of Radio-Quiet Quasars. Comparison With Accretion Disk Models
H. Brunner, C. Mueller, P. Friedrich +3
We present UV to soft X-ray spectra of 31 radio-quiet quasars, comprising data from the IUE ULDA database and the ROSAT pointed observation phase. 90 % of the sample members show a…
The Seyfert Galaxy NGC 6814 -- a highly variable X-ray source
Michael Koenig, Susanne Friedrich, Ruediger Staubert +1
The Seyfert galaxy NGC 6814 is a highly variable X-ray source despite the fact that it has recently been shown not to be the source of periodic variability. The 1.5 year monitoring…