Astrophysical: Quasars

  • Publication
    Revealing the inner workings of the lensed quasar SDSS J1339+1310: Insights from microlensing analysis
    Aims. We aim to unveil the structure of the continuum and broad-emission line (BEL) emitting regions in the gravitationally lensed quasar SDSS J1339+1310 by...
  • Publication
    Revealing the structure of the lensed quasar Q 0957+561. I. Accretion disk size
    Aims: We aim to use signatures of microlensing induced by stars in the foreground lens galaxy to infer the size of the accretion disk in the gravitationally...
  • Publication
    Revealing the structure of the lensed quasar Q 0957+561. II. Supermassive black hole mass via gravitational redshift
    Aims: We intend to use the impact of microlensing on the Fe III λλ2039−2113 emission line blend along with a measure of its gravitational redshift to estimate...
  • Publication
    Revealing the structure of the lensed quasar Q 0957+561. III. Constraints on the size of the broad-line region
    Aims: Our aim is to examine the size, kinematics, and geometry of the broad-line region (BLR) in the double-lensed quasar Q 0957+561 by analyzing the impact of...
  • Publication
    Rotating discs and non-kinematic double peaks
    Double-peaked line profiles are commonly considered a hallmark of rotating discs, with the distance between the peaks a measure of the rotation velocity...
  • Publication
    RXJ 0921+4529: A Binary Quasar or a Gravitational Lens?
    We report the new spectroscopic observations of the gravitational lens RXJ 021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6 m telescope. The...
  • Publication
    San Pedro Mártir observations of microvariability in obscured quasars
    Fast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or...
  • Publication
    SDSS analysis of Galactic stellar streams
    The last years saw numerous detections of substructure in the Galactic halo, largely due to wide area surveys like the Sloan Digital Sky Survey (SDSS) or the...
  • Publication
    SDSS J0909+4449: A large-separation strongly lensed quasar at z ˜ 2.8 with three images
    We report the discovery of SDSS J0909+4449, an exceptional system consisting of a quasar at z = 2.788 strongly lensed by a group of galaxies at z ˜ 0.9 into...