Results 11 to 20 of about 1,386,746 (158)
Polarization and variations of bl lacertae objects [PDF]
Publications of the Astronomical Society of Japan, 2001 BL Lacertae objects are an extreme subclass of AGNs showing rapid and large-amplitude variability, high and variable polarization, and core-dominated radio emissions.
Cheng, KS, Fan, JH, Zhang, L
core +4 more sources
THE COSMIC EVOLUTION OF FERMI BL LACERTAE OBJECTS [PDF]
The Astrophysical Journal, 2014 Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a uniformly selected set of 211 BL Lacertae (BL Lac) objects detected by Fermi during its first year of operation.
Cotter, G. +41 more
core +7 more sources
BL Lacertae objects and the extragalactic γ-ray background [PDF]
Research in Astronomy and Astrophysics, 2011 A tight correlation between gamma-ray and radio emission is found for a sample of BL Lacertae (BL Lac) objects detected by the Fermi Gamma-ray Space Telescope (Fermi) and the Energetic Gamma-Ray Experiment Telescope (EGRET).
Li, Fan, Fan Li, Cao, Xin-Wu, Xin-Wu Cao
core +3 more sources
Radio luminosities and classificatory criteria of BL Lacertae objects [PDF]
Astronomy & Astrophysics, 2002 Using the sample of radio-selected BL Lacertae objects (RBLs) and X-ray selected BL Lacertae objects (XBLs) presented by Sambruna et al. ([CITE]), we calculated the luminosities in radio, optical and X-ray of each source and made a statistical analysis ...
Z. J. Jiang, D. C. Mei, L. Zhang
core +3 more sources
BL Lacertae objects as an evolutionary population [PDF]
Symposium - International Astronomical Union, 1986 If the BL Lac Objects are active nuclei with a beamed component that is dominant when directed at us, their observed luminosity function must comprise a flat faint branch: N(L)dL ∝ L1+1/pdL with p=4.5 (Urry and Shafer 1984). If this is flatter than the LF NP(L) of the parent objects at equal observed L, then we expect the counts of BL Lacs to flatten ...
A. Cavaliere, E. Giallongo, F. Vagnetti
openaire +1 more source
An optical view of BL Lacertae objects [PDF]
The Astronomy and Astrophysics Review, 2014 44 pages, 21 figure, to appear in The Astronomy and Astrophysics ...
Falomo, Renato +2 more
openaire +2 more sources
Radio Polarization of BL Lacertae Objects [PDF]
Publications of the Astronomical Society of Japan, 2006 In the present work, using the data base of the University of Michigan Radio Astronomy Observatory (UMRAO) at three radio frequencies (4.8 GHz, 8GHZ, and 14.5 GHz), we studied the polarization properties for 47 BL Lacertae objects: 38 radio selected BL Lac objects, 7 X-ray selected BL Lac objects, and two inter-middle objects (Mkn 421 and Mkn 501), and
Fan, Jun-Hui +8 more
openaire +2 more sources
ZBLLAC: A Spectroscopic Database of BL Lacertae Objects [PDF]
The Astrophysical Journal Supplement Series, 2020 Abstract This paper describes the database of optical spectra of BL Lacertae (BLL) objects (Z BLL objects) available at https://web.oapd.inaf.it/zbllac/. At present, it contains calibrated spectra for 295 BLL. For about 35% of them, we report a firm measure of redshift z, while for 35 sources we set a lower limit on z based on the ...
Marco Landoni +3 more
openaire +2 more sources
Power for dry BL Lacertae objects [PDF]
Astronomy & Astrophysics, 2009 4 pages, 3 figures, accepted by A& ...
Paggi, A. +3 more
openaire +2 more sources
The Evolution of the BL Lacertae Objects [PDF]
The Astrophysical Journal, 1999 The BL Lac population is set apart from the rest of the active galactic nuclei by a number of peculiar features, including remarkably little signs of cosmological evolution. We focus on this feature, and take hint from the observations to reconsider extraction of the primary energy from a Kerr hole via the Blandford-Znajek (BZ) process; in fact, we ...
Cavaliere, A., Malquori, D.
openaire +2 more sources