348 datasets found

Keywords: bl lacertae objects

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  • {gamma}-ray signature in WHSP blazars (1BIGB)

    A direct search of {gamma}-ray emission centered on multifrequency selected candidates is a valuable complementary approach to the standard search adopted in current {gamma}-ray...
  • MOJAVE. XIII. New 15GHz observations on 1994-2013

    We present 1625 new 15GHz (2cm) VLBA images of 295 jets associated with active galactic nuclei (AGNs) from the MOJAVE and 2cm VLBA surveys, spanning observations between 1994...
  • B2 1811+31 multiwavelength lightcurves and SEDs

    Among the blazars whose emission has been detected up to very-high-energy (VHE; 100GeV<E<100TeV) gamma rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare....
  • Einstein EMSS Survey

    The Einstein Extended Medium Sensitivity Survey (EMSS) consists of 835 serendipitous X-ray sources detected at or above 4 times the rms level in 1435 IPC fields with their...
  • BL Lac objects and OVV quasars

    Based on the idea that a group of extragalactic objects which can be regarded as a category with similar physical properties must fit the Hubble relation, we present a new,...
  • ROSAT observations of BL Lacertae objects

    We present soft X-ray spectra of 74 BL Lacertae objects observed with the PSPC detector on board of the ROSAT satellite. The sample contains all BL Lac objects detected during...
  • BV(RI)c photometry of S5 0716+714

    Table 2 reports the journal of observations. For each date the measured magnitudes and their uncertainties in the four filters together with the used telescope are given. In...
  • BR photometry of ON 231

    We present R- and B-band CCD observations of ON 231 that were made at the Dark Sky Observatory at Appalachian State University (DSO-data) during 37 nights in April 1998 -...
  • VRI photometry of BL Lac (1997-1999)

    We present the optical (V, R, and I) photometry for BL Lacertae, which was observed from 1997 through 1999, with the 1.56-m telescope at the Shanghai astronomical observatory...
  • Hard X-ray properties of blazars

    We have considered all blazars observed in the X-ray band and for which the slope of the X-ray spectrum is available. We have collected 421 spectra of 268 blazars, including 12...
  • Bright southern sub-mm sources

    Table1 contains the 130 brightest sources of a 230GHz survey of quasars and BL Lacertae objects performed at the SEST. The objects which showed a 230GHz flux density above500...
  • List of extra-galactic radio jets

    Table 1 lists 661 radio sources with detected radio jets known to us prior to the end of December 2000
  • Long-Term Polarization of BL Lac

    Both photometric and polarimetric data of BL Lac were obtained with the .5-m telescopes of the Byurakan station of the Astronomical Institute of St.-Petersburg University.
  • BV(RI)c photometry of ON 231 during outburst

    We present the results of the optical monitoring of the BL Lac object ON 231 from 1997 to the spring 2001, including the large outburst of spring 1998. After this event the mean...
  • The HRX-BL Lac sample

    The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar research in the past years. Recent investigations have shown that the gap...
  • TeV Gamma-Rays from 1ES1959+650

    TeV gamma-rays from the BL Lac object 1ES1959+650 have been measured during the years 2000 and 2001 with a significance of 5.2{sigma} at a value of 5.3% of the Crab flux and in...
  • 2001 Flare of Mkn 421 in gamma-ray

    In the first months of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy...
  • BVRI photometry of OQ 530

    Results of VLBI and optical observations are presented for the BL Lac object OQ 530 (B1418+546), whose long-term optical variability is characterised by a decreasing mean...
  • Spectral catalog of BeppoSAX blazars

    We present a spectral catalog for blazars based on the BeppoSAX archive. The sample includes 44 High-energy peaked BL Lacs (HBLs), 14 Low-energy peaked BL Lacs (LBLs), and 28...
  • X-ray/radio data of high energy peaked BL Lacs

    The fully identified complete sample including 150 extreme HBL BL Lacs is presented in Table 1 where we give the source name built with the catalog identification code SHBL...
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