324 datasets found

Keywords: BL Lacertae objects

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  • Optical monitoring from 2020-2022 of BL Lac

    BL Lacertae is a key monitoring target of the 1.26m National Astronomical Observatory-Guangzhou University Infrared/Optical telescope. Within the monitored duration from 2020...
  • Optical spectroscopy of blazars for CTA. III

    Blazars, which include BL Lacs and flat-spectrum radio quasars (FSRQs), represent the brightest persistent extragalactic sources in the high-energy (HE; 10MeV-100GeV) and...
  • The Roma BZCAT - 5th edition

    The Roma-BZCAT is now at the 5th Edition which contains coordinates and multi-frequency data of 3561 sources, about 30% more than in the 1st edition, either confirmed blazars or...
  • Quasars and Active Galactic Nuclei (13th Ed.)

    This catalogue is a compilation of all known AGNs presented in a compact and convenient form. It is an update of the previous versions; and as in the previous editions no...
  • Quasars and Active Galactic Nuclei (12th Ed.)

    This catalogue is an update of the previous versions; as in the previous editions no information about absorption lines of X-ray properties are given, but absolute magnitudes...
  • Quasars and Active Galactic Nuclei (11th Ed.)

    This catalogue is an update of the previous versions. The recent release of the final release of the 2dF quasar catalogue and of the first part of the SLOAN catalogue, almost...
  • Quasars and Active Galactic Nuclei (10th Ed.)

    This catalogue is an update of the previous versions. The recent publication of the first release of the 2dF quasar survey (Croom et al., 2001MNRAS.322L..29C, see Cat. )...
  • Quasars and Active Galactic Nuclei (9th Ed.)

    This catalogue is an update of the previous versions. It contains 13214 (+1856) quasars (defined as brighter than absolute B magnitude -23), 4428 (+1094) AGNs (defined as...
  • Quasars and Active Galactic Nuclei (8th Ed.)

    This catalogue is an update of the previous versions. It contains 11358 (+2759) quasars (defined as brighter than absolute B magnitude -23), 3334 (+501) AGNs (defined as fainter...
  • Quasars and Active Galactic Nuclei (7th Ed.)

    This catalogue is an update of the the previous versions. It contains 8609 (+172) quasars (defined as brighter than absolute B magnitude -23), 2833 (+978) AGNs (defined as...
  • Revised and Updated Catalog of Quasi-stellar Objects

    This is a catalog of all known quasi-stellar objects (QSO's) with measured emission redshifts and BL Lac objects, complete to 1992 December 31. The catalog contains 7312...
  • S5 0716+714 polarization & brightness 1991-2004

    We investigate the photometric and polarimetric behavior of the blazar S5 0716+714 based on the observations carried out in 1991-2004 at the 125-cm Crimean Astrophysical...
  • BV(RI)c-JHK photometry of BL Lac in 1999-2001

    Results of multicolor observations of BL Lac in 1999-2001 are presented. We show that the spectral energy distribution of the variable component in the range from K to B had...
  • gamma-ray properties of FR-Is and BL Lacs

    Our knowledge of Giga-electron volt (GeV) radio galaxies has been revolutionized by the Fermi-LAT Telescope, which provides an excellent opportunity to study the physical...
  • Multi-wave band emission from blazars

    We studied the correlations of the flux of the broad-line emission (FBLR) with the X-ray emission flux, optical emission flux at 5500{AA} and radio emission flux at 5GHz,...
  • gamma-ray spectrum for Fermi blazars

    The curvature of the {gamma}-ray spectrum in blazars may reflect the intrinsic distribution of emitting electrons, which will further give some information on the possible...
  • Sample of Fermi Blazars

    We study the {gamma}-ray luminosity and beaming effect for Fermi blazars. Our results are as follows. (i) There are significant correlations between {gamma}-ray luminosity and...
  • Doppler factor for a Fermi blazar sample

    We selected 457 blazars (193 flat spectrum radio quasars, 61 low-synchrotron peaked blazars, 69 intermediate-synchrotron peaked blazars and 134 high-synchrotron peaked blazars)...
  • {gamma}-ray Doppler factor for Fermi blazars

    Observations suggest that gamma-ray loud blazars are strongly beamed. The Fermi mission has detected many of blazars, which provide us with a good opportunity to investigate the...
  • Corrections to the VV13 Catalogue

    Fixes are presented to be applied to the Veron-Cetty and Veron (VCV) Quasar Catalogue, 13th edition (Cat. VII/258). These are comprised of 39 deduplicati ons, 380 astrometric...
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