348 datasets found

Keywords: bl lacertae objects

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  • J-band variability of AGN

    Spectral energy distribution and its variability are basic tools for understanding the physical processes operating in active galactic nuclei (AGN). In this paper we report the...
  • S5 0716+714 microvariability observation

    The international whole earth blazar telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716+714 from February 22,...
  • Historical outbursts of OJ287

    We report on historical optical outbursts in the OJ287 system in 1900 and 1913, detected on archival astronomical plates of the Harvard College Observatory. The 1900 outburst is...
  • 43GHz observation of the blazar Mrk 421

    We report the results obtained for the AGN Markarian 421 by model-fitting the data in the visibility plane, studing the proper motion of jet components, the light curve, and the...
  • SDSS optically selected BL Lac candidates

    Deep optical surveys open the avenue for finding large numbers of BL Lac objects that are hard to identify because they lack the unique properties classifying them as such....
  • XShooter spectrum of 4 BL Lacs

    We aim to determine the redshift (or stringent lower limits) of a number of bright BL Lacs objects. We secured optical and near-infrared medium resolution spectra of four bright...
  • The 2009 multiwavelength campaign on Mrk421

    We perform an extensive characterization of the broadband emission of Mrk 421, as well as its temporal evolution, during the non-flaring (low) state. The high brightness and...
  • Mrk421 in March 2010

    A flare from the TeV blazar Mrk 421, occurring in March 2010, was observed for 13 consecutive days from radio to very high energy (VHE; E>100GeV) gamma-rays with MAGIC,...
  • The MWA view of Fermi blazars

    Low-frequency radio arrays are opening a new window for the study of the sky, both to study new phenomena and to better characterize known source classes. Being flat-spectrum...
  • Dynamic SEDs of southern blazars - DSSB

    Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. We study the spectral evolution...
  • Optical flux behaviour of Fermi blazars

    We aim at investigating the time-behaviour of a sample of gamma-ray blazars. We present the results from a 13 month-long optical photometry monitoring campaign of the blazars...
  • Mrk 421 multi-wavelength variability, 2007-2009

    We perform an extensive multi-band variability and correlation study of the TeV blazar Mrk 421 on year time scales, which can bring additional insight on the processes...
  • Radio light curves of 8 AGN

    To fully exploit the scientific potential of the Fermi mission for the physics of active galactic nuclei (AGN), we initiated the F-GAMMA programme. Between 2007 and 2015 the...
  • R-band polarization curves of 48 BL Lacs

    We investigate the optical polarization properties of high-energy BL Lac objects using data from the RoboPol blazar monitoring program and the Nordic Optical Telescope. We wish...
  • S5 0716+714 VLBI K- and Q-band variability

    This study aims to search for the existence of intraday variability (IDV) of BL Lac object S5 0716+714 at high radio frequencies for which the interstellar scintillation effect...
  • Blazar candidates among Fermi/LAT 3FGL catalog

    We present a study to search for, and characterise blazar candidates among the Fermi/LAT 3FGL catalogue using machine-learning classification methods. Classifiers are based on...
  • TeV/non-TeV BL Lacs multi-lambda fluxes

    We have collected the most complete multi-wavelength (6.0-6.0E^-18^cm) dataset of very high energy (VHE) gamma-ray emitting (TeV) BL Lacs, which are the most numerous...
  • OJ 287 far-infrared photometry

    The blazar OJ 287 has shown a ~~12 year quasi-periodicity over more than a century, in addition to the common properties of violent variability in all frequency ranges. It is...
  • 9Y-MST Catalogue

    We describe a catalogue of gamma-ray source candidates selected using the minimum spanning tree (MST) algorithm on the nine year Fermi-LAT sky (Pass 8) at energies higher than...
  • S5 0716+714 multi-wavelength curves

    The BL Lac object S5 0716+714, a highly variable blazar, underwent an impressive outburst in January 2015 (Phase A), followed by minor activity in February (Phase B). The MAGIC...
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