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Spectral formation in accreting X-ray pulsars: bimodal variation of the cyclotron energy with luminosity
Context. Accretion-powered X-ray pulsars exhibit significant variability of the cyclotron resonance scattering feature (CRSF) centroid energy on pulse-to-pulse timescales, and also on much longerExpand
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The multiwavelength variability of 3C 273
Aims. We present an update of the 3C 273’s database hosted by the ISDC, completed with data from radio to gamma-ray observations over the last 10 years. We use this large data set to study theExpand
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High variability in Vela X-1: giant flares and off states
Aims. We investigate the spectral and temporal behavior of the high mass X-ray binary Vela X-1 during a phase of high activity, with special focus on the observed giant flares and off states.Expand
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The variable cyclotron line in GX 301-2
We present pulse phase resolved spectra of the hypergiant high mass X-ray binary GX 301−2. We observed the source in 2001 October with RXTE continuously for a total on-source time of almost 200 ks.Expand
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Confirmation of two cyclotron lines in Vela X-1
We present pulse phase-resolved X-ray spectra of the high mass X-ray binary Vela X-1 using the Rossi X-ray Timing Explorer. We observed Vela X-1 in 1998 and 2000 with a total observation time ofExpand
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INTEGRAL and RXTE Observations of Centaurus A
INTEGRAL and RXTE performed three simultaneous observations of the nearby radio galaxy Centaurus A in 2003 March, 2004 January, and 2004 February with the goals of investigating the geometry andExpand
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GRO J1008−57: an (almost) predictable transient X-ray binary
A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high-mass X-ray binary GRO J1008 57 is presented. A new orbital ephemeris based on pulse arrival-timing shows theExpand
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LMC X-4: 13.5 s pulsations and an X-ray flare observed by EXOSAT
EXOSAT observed LMC X-4 on November 17/19, 1983 for one 1.4 day binary period during the high state of the 30.5 day cycle. An eclipse with sharp ingress and slow egress was detected with an eclipseExpand
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The first broad-band X-ray images and spectra of the 30 Doradus region in the LMC
We present the XMM-Newton first light image, taken in January 2000 with the EPIC pn camera during the instrument's commissioning phase, when XMM-Newton was pointing towards the Large Magellanic CloudExpand
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The XMM-Newton view of the Crab
Aims. We discuss the current X-ray view of the Crab Nebula and Pulsar, summarising our analysis of observations of the source with the EPIC-pn camera on board the XMM-Newton observatory. DifferentExpand
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