Astrophysical: Gamma rays

  • Publication
    A Search for Spectral Hysteresis and Energy-dependent Time Lags from X-Ray and TeV Gamma-Ray Observations of Mrk 421
    Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars...
  • Publication
    A Search for Very High Energy Gamma-Ray Emission from Scorpius X-1 with the Magic Telescopes
    The acceleration of particles up to GeV or higher energies in microquasars has been the subject of considerable theoretical and observational efforts in the...
  • Publication
    A significant hardening and rising shape detected in the MeV/GeV νFν spectrum from the recently discovered very-high-energy blazar S4 0954+65 during the bright optical flare in 2015 February
    We report on Fermi Large Area Telescope (LAT) and multi-wavelength results on the recently discovered very-high-energy (VHE, E > 100 GeV) blazar S4 0954+65 (z =...
  • Publication
    AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst
    Context. The flat-spectrum radio quasar 4C +71.07 is a high-redshift (z = 2.172), γ-loud blazar whose optical emission is dominated by thermal radiation from...
  • Publication
    An HST Study of the Supernovae Accompanying GRB 040924 and GRB 041006
    We present the results from a Hubble Space Telescope ACS study of the supernovae (SNe) associated with gamma-ray bursts (GRBs) 040924 (z=0.86) and 041006 (z=0...
  • News
    Astronomers discover rapid oscillations in the light of a blazar
    The international collaboration Whole Earth Blazar Telescope (WEBT), in which researchers from the Instituto de Astrofísica de Canarias (IAC) participate, has...
  • Publication
    Astrophysical Parameters of LS 2883 and Implications for the PSR B1259-63 Gamma-ray Binary
    Only a few binary systems with compact objects display TeV emission. The physical properties of the companion stars represent basic input for understanding the...
  • Publication
    Auroral and Non-auroral X-ray Emissions from Jupiter: A Comparative View
    Jovian X-rays can be broadly classified into two categories: (1) "auroral" emission, which is confined to high-latitudes ( ˜>60° ) at both polar regions, and (2...
  • Publication
    Broad-band continuum and line emission of the gamma-ray blazar PKS 0537-441
    PKS 0537-441, a bright gamma -ray emitting blazar, was observed at radio, optical, UV and X-ray frequencies during various EGRET pointings, often quasi...