Astrophysical: Black hole physics

  • Publication
    OJ 287 and the predicted fade of 1998
    There were predictions that blazar OJ 287 should have faded in late 1997 or early 1998. The observational background for these predictions is the sudden fade of...
  • Publication
    Optical Emission of the Ultraluminous X-Ray Source NGC 5408 X-1: Donor Star or Irradiated Accretion Disk?
    We obtained three epochs of simultaneous Hubble Space Telescope (HST)/Wide Field Camera 3 and Chandra observations of the ultraluminous X-ray source (ULX) NGC...
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    Optical Properties of the Ultraluminous X-Ray Source Holmberg IX X-1 and Its Stellar Environment
    Holmberg IX X-1 is an archetypal ultraluminous X-ray source (ULX). Here we study the properties of the optical counterpart and of its stellar environment using...
  • Publication
    Optical studies of the X-ray transient XTE J2123-058 - I. Photometry
    We present optical photometry of the X-ray transient XTE J2123-058, obtained in 1998 July-October. The light curves are strongly modulated on the 5.95-h orbital...
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    Optical Study of the Hyper-luminous X-Ray Source 2XMM J011942.7+032421
    We present the identification and characterization of the optical counterpart to 2XMM J011942.7+032421, one of the most luminous and distant ultra-luminous X...
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    Overview of an extensive multi-wavelength study of GX 339-4 during the 2010 outburst
    Context. The microquasar GX 339-4 experienced a new outburst in 2010: it was observed simultaneously at various wavelengths from radio up to soft γ-rays. We...
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    Overview of an extensive multi-wavelength study of GX 339-4 during the 2010 outburst (Corrigendum)
    Not Available
  • Publication
    Parallel tracks in infrared versus X-ray emission in black hole X-ray transient outbursts: a hysteresis effect?
    We report the discovery of a new hysteresis effect in black hole X-ray binary state transitions, that of the near-infrared (NIR) flux (which most likely...
  • Publication
    Phase-dependent Study of Near-infrared Disk Emission Lines in LB-1
    The mass, origin, and evolutionary stage of the binary system LB-1 have been intensely debated, following the claim that it hosts an ∼70M ☉ black hole, in stark...