• Publication
    The Structure of the Accretion Disk in the Lensed Quasar SBS 0909+532
    We derive the size and temperature profile of the accretion disk of the lensed quasar SBS 0909+532 by measuring the wavelength dependence (chromaticity) of the...
  • Publication
    The uncertain interstellar medium of high-redshift quiescent galaxies: Impact of methodology
    How much gas and dust is contained in high-redshift quiescent galaxies (QGs) is currently an open question with relatively few and contradictory answers, as...
  • Publication
    The Wendelstein Calar Alto Pixellensing Project (WeCAPP): First MACHO Candidates
    We report the detection of the first two microlensing candidates from the Wendelstein Calar Alto Pixellensing Project (WeCAPP). Both are detected with a high...
  • Publication
    Three sub-Jovian-mass microlensing planets: MOA-2022-BLG-563Lb, KMT-2023-BLG-0469Lb, and KMT-2023-BLG-0735Lb
    Aims: We analyze the anomalies appearing in the light curves of the three microlensing events MOA-2022-BLG-563, KMT-2023-BLG-0469, and KMT-2023-BLG-0735. The...
  • Publication
    Time Delay in QSO 0957+561 From 1984-1999 Optical Data
    Photometric optical data of QSO 0957+561 covering the period 1984-1999 are analyzed to discern between the two values of the time delay (417 and 424 days)...
  • Publication
    Time Delay of QSO 0957+561 and Cosmological Implications
    We obtain the time delay between the arrival time of the A and B images of the QSO 0957+561. The results of applying two different methods (the discrete cross...
  • Publication
    Toward an Internally Consistent Astronomical Distance Scale
    Accurate astronomical distance determination is crucial for all fields in astrophysics, from Galactic to cosmological scales. Despite, or perhaps because of...
  • Publication
    Two new free-floating or wide-orbit planets from microlensing
    Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light...
  • Publication
    Two-dimensional Spectroscopy Reveals an Arc of Extended Emission in the Gravitational Lens System Q2237+0305
    We present two-dimensional spectroscopy of the gravitational lens system Q2237+0305 (Einstein Cross) obtained with the INTEGRAL fiber system in subarcsecond...