Astrofísicas: Acreción

  • Publicación
    When the disc's away, the stars will play: dynamical masses in the nova-like variable KR Aur with a pinch of accretion
    We obtained time-resolved optical photometry and spectroscopy of the nova-like variable KR Aurigae in the low state. The spectrum reveals a DAB white dwarf (WD)...
  • Publicación
    X-ray binary accretion states in active galactic nuclei? Sensing the accretion disc of supermassive black holes with mid-infrared nebular lines
    Accretion states, which are universally observed in stellar mass black holes in X-ray binaries, might be expected in active galactic nuclei (AGN). This is the...
  • Publicación
    X-ray softening in the new X-ray transient XTE J1719-291 during its 2008 outburst decay
    The X-ray transient XTE J1719-291 was discovered with Rossi X-ray Timing Explorer/Proportional Counter Array (RXTE/PCA) during its outburst in 2008 March, which...
  • Publicación
    X-ray spectral and timing evolution of MAXI J1727-203 with NICER
    We present a detailed X-ray spectral and variability study of the full 2018 outburst of MAXI J1727-203 using NICER observations. The outburst lasted...
  • Publicación
    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...
  • Publicación
    X-ray Spectral State is not Correlated with Luminosity in Holmberg II X-1
    The ultraluminous X-ray source (ULX) Holmberg II X-1 has been observed over four months in 2009/2010 by the Swift observatory. The source luminosity varied by a...
  • Publicación
    X-Ray States of Redback Millisecond Pulsars
    Compact binary millisecond pulsars with main-sequence donors, often referred to as "redbacks," constitute the long-sought link between low-mass X-ray binaries...
  • Publicación
    X-ray variability of 104 active galactic nuclei
    We have performed a uniform analysis of the power spectrum densities (PSDs) of 104 nearby (z ~= 2 × 10-4 Hz. Only KUG 1031+398 (RE J1034+396) shows evidence for...
  • Publicación
    X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
    Context. Active galactic nuclei (AGN), powered by accretion onto supermassive black holes (SMBHs), are thought to be scaled up versions of Galactic black hole X...