Journal: Astronomy and Astrophysics

  • Publication
    X-ray confirmation of the intermediate polar HT Cam
    We report on the first pointed X-ray observations with XMM-Newton and RXTE satellites of the X-ray source RX J0757.0+6306 = HT Cam. We detect a strong 515 s X...
  • Publication
    X-ray flashes or soft gamma-ray bursts?. The case of the likely distant XRF 040912
    Context: The origin of X-ray Flashes (XRFs) is still a mystery and several models have been proposed. To disentangle among these models, an important...
  • Publication
    X-ray long-term variations in the low-luminosity AGN NGC 835 and its circumnuclear emission
    Context. Obscured active galactic nuclei (AGNs) are thought to be very common in the Universe. Observations and surveys have shown that the number of sources...
  • Publication
    X-ray monitoring of classical novae in the central region of M 31. I. June 2006-March 2007
    Context. Classical novae (CNe) have recently been reported to represent the major class of supersoft X-ray sources (SSSs) in the central region of our neighbour...
  • Publication
    X-ray monitoring of optical novae in M 31 from July 2004 to February 2005
    Context: Optical novae have recently been identified as the major class of supersoft X-ray sources in M 31 based on ROSAT and early XMM-Newton and Chandra...
  • Publication
    X-ray properties of the white dwarf pulsar eRASSU J191213.9−441044
    We report X-ray observations of the newly discovered pulsating white dwarf eRASSU J191213.9−441044 with Spectrum Roentgen Gamma and eROSITA (SRG/eROSITA) and...
  • Publication
    X-ray spectral evolution of SAX J1747.0-2853 during outburst activity and confirmation of its transient nature
    SAX J1747.0-2853 is an X-ray transient which exhibited X-ray outbursts yearly between 1998 and 2001, and most probably also in 1976. The outburst of 2000 was...
  • Publication
    X-ray spectral properties of active galactic nuclei in the Chandra Deep Field South
    We present a detailed X-ray spectral analysis of the sources in the 1Ms catalog of the Chandra Deep Field South (CDFS) taking advantage of optical spectroscopy...
  • Publication
    X-ray spectral variability of LINERs selected from the Palomar sample
    Context. Variability is a general property of active galactic nuclei (AGN). The way in which these changes occur at X-rays is not yet clearly understood. In the...