Astrophysical: Black holes

  • Publication
    Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS
    The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (also known as S200224ca) and classified as a binary-black hole coalescence, on...
  • Publication
    Furiously fast and red: sub-second optical flaring in V404 Cyg during the 2015 outburst peak
    We present observations of rapid (sub-second) optical flux variability in V404 Cyg during its 2015 June outburst. Simultaneous three-band observations with the...
  • Publication
    Galactic Black Hole Transient H1743-322 in transition to the hard state
    Galactic black hole transient H1743-322 has been in outburst since UT 2009 May 26, (ATELs #2058, #2062). The RXTE PCA count rate has been dropping since 2009...
  • Publication
    Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
    MAXI J1820+070 is a low-mass X-ray binary with a black hole (BH) as a compact object. This binary underwent an exceptionally bright X-ray outburst from 2018...
  • Publication
    GX 339-4 Approaching Quiescence ?
    The black hole X-ray binary (BHXB) GX 339-4 continues to fade in the optical, and has now reached its faintest optical flux since (at least) the start of its...
  • Publication
    Hard-state Accretion Disk Winds from Black Holes: The Revealing Case of MAXI J1820+070
    We report on a detailed optical spectroscopic follow-up of the black hole (BH) transient MAXI J1820+070 (ASASSN-18ey). The observations cover the main part of...
  • Publication
    Hibernating black holes revealed by photometric mass functions
    We present a novel strategy to uncover the Galactic population of quiescent black holes (BHs). This is based on a new concept, the photometric mass function...
  • Publication
    High time resolution optical/X-ray cross-correlations for X-ray binaries: anticorrelations and rapid variability
    Using simultaneous observations in X-rays and optical, we have performed a homogeneous analysis of the cross-correlation behaviours of four X-ray binaries...
  • Publication
    High-precision optical polarimetry of the accreting black hole V404 Cyg during the 2015 June outburst
    Our simultaneous three-colour (BVR) polarimetric observations of the low-mass black hole X-ray binary V404 Cyg show a small but statistically significant change...