Astrophysical: Galaxies

  • Publication
    Systematic Search for VHE Gamma-Ray Emission from X-Ray-bright High-Frequency BL Lac Objects
    All but three (M87, BL Lac, and 3C 279) extragalactic sources detected so far at very high energy γ-rays belong to the class of high-frequency-peaked BL Lac...
  • Publication
    Systematic variation of the stellar initial mass function with velocity dispersion in early-type galaxies
    An essential component of galaxy formation theory is the stellar initial mass function (IMF) that describes the parent distribution of stellar mass in star...
  • Publication
    Temperature Bias and the Primordial Helium Abundance Determination
    We study the effect that the temperature structure has on the determination of the primordial helium abundance, Yp. We provide an equation linking T(O III), the...
  • Publication
    Testing emission models on the extreme blazar 2WHSP J073326.7+515354 detected at very high energies with the MAGIC telescopes
    Extreme high-energy-peaked BL Lac objects (EHBLs) are an emerging class of blazars. Their typical two-hump-structured spectral energy distribution (SED) peaks...
  • Publication
    Testing Intermediate-Age Stellar Evolution Models with VLT Photometry of Large Magellanic Cloud Clusters. I. The Data
    This is the first of a series of three papers devoted to the calibration of a few parameters of crucial importance in the modeling of the evolution of...
  • Publication
    Testing Intermediate-Age Stellar Evolution Models with VLT Photometry of Large Magellanic Cloud Clusters. II. Analysis with the Yale Models
    Using Yale stellar evolution models, we present an analysis of the color-magnitude diagrams (CMDs) of three intermediate-age LMC clusters, namely, NGC 2173, SL...
  • Publication
    Testing Intermediate-Age Stellar Evolution Models with VLT Photometry of Large Magellanic Cloud Clusters. III. Padova Results
    The color-magnitude diagrams (CMDs) of three intermediate-age Large Megallanic Cloud clusters, NGC 2173, SL 556, and NGC 2155, are analyzed to determine their...
  • Publication
    Testing Microvariability in Quasar Differential Light Curves Using Several Field Stars
    Microvariability consists of small timescale variations of low amplitude in the photometric light curves of quasars and represents an important tool to...
  • Publication
    Testing stellar population models with star clusters in the Large Magellanic Cloud
    We present high signal-to-noise ratio integrated spectra of 24 star clusters in the Large Magellanic Cloud (LMC), obtained using the FLAIR spectrograph at the...