Astrofísicas: Acreción

  • Publicación
    A possible black hole in the γ-ray microquasar LS 5039
    The population of high-energy and very high-energy γ-ray sources, detected with EGRET and the new generation of ground-based Cherenkov telescopes, forms a...
  • Publicación
    A rapid optical and X-ray timing study of the neutron star X-ray binary Swift J1858.6-0814
    We present a rapid timing analysis of optical (HiPERCAM and ULTRACAM) and X-ray (NICER) observations of the X-ray transient Swift J1858.6-0814 during 2018 and...
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    A refined dynamical mass for the black hole in the X-ray transient XTE J1859+226
    We present two contiguous nights of simultaneous time-resolved Gran Telescopio Canarias spectroscopy and William Herschel Telescope photometry of the black hole...
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    A return to strong radio flaring by Circinus X-1 observed with the Karoo Array Telescope test array KAT-7
    Circinus X-1 is a bright and highly variable X-ray binary which displays strong and rapid evolution in all wavebands. Radio flaring, associated with the...
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    A Robust Determination of the Size of Quasar Accretion Disks Using Gravitational Microlensing
    Using microlensing measurements for a sample of 27 image pairs of 19 lensed quasars we determine a maximum likelihood estimate for the accretion disk size of an...
  • Publicación
    A search for evidence of irradiation in Centaurus X-4 during quiescence
    Aims.We present a study of the neutron star X-Ray Transient Cen X-4. Our aim is to look for any evidence of irradiation of the companion with a detailed...
  • Publicación
    A signature of the donor star in the extra-galactic X-ray binary LMCX-2
    Two nights of phase-resolved medium-resolution Very Large Telescope spectroscopy of the extra-galactic low-mass X-ray binary LMCX-2 have revealed a 0.32 +/- 0...
  • Publicación
    A Strongly Heated Neutron Star in the Transient Z Source MAXI J0556-332
    We present Chandra, XMM-Newton, and Swift observations of the quiescent neutron star in the transient low-mass X-ray binary MAXI J0556-332. Observations of the...
  • Publicación
    A Study of Gravitational Lens Chromaticity Using Ground-based Narrowband Photometry
    We present observations of wavelength-dependent flux ratios for four gravitational lens systems (SDSS J1650+4251, HE 0435-1223, FBQ 0951+2635, and Q 0142-100)...