Results 61 to 70 of about 1,386,746 (158)
Multi-Band Optical Variability of Blazar 1ES 2344+514 on Diverse Time-Scales
Journal of Advanced Research in Natural and Applied SciencesThis study presents the results of multi-band observations from 2022 to 2024 and Zwicky Transient Facility (ZTF) observations from 2018 to 2023, examining the flux variability of the blazar 1ES 2344+514 on diverse time-scales in the optical bands.
Aykut Özdönmez
doaj +1 more source
The Radio Properties of BL Lacertae Objects [PDF]
Symposium - International Astronomical Union, 1980 A recent study of the properties of BL Lacertae Objects at λλ6 and 21 cm by K.J. Johnston and myself has shown:
openaire +1 more source
Optical Photometric Monitoring of Gamma-Ray Bright Bl Lacertae Objects
, 2018 BL Lacertae objects are the most extreme members of a class of objects known as Active Galactic Nuclei. Most models of the AGN phenomena involve a central, supermassive black hole, surrounded by an accretion disk.
Hopper, Lindsay
core +1 more source
VLBI Observations of Nearby HBLs: Physical Implications
GalaxiesWe review the jet kinematics of HBL blazars based on results of the MOJAVE survey, which obtained images of active galactic nuclei with the Very Long Baseline Array (VLBA) at 15 GHz, and the VLBA-BU-BLAZAR program as well as its successor BEAM-ME program,
Svetlana G. Jorstad +2 more
doaj +1 more source
Deep optical imaging of radio selected BL Lacertae objects
, 2002 Deep imaging data on radio-selected BL Lacertae objects are presented. The complete 1 Jy sample consists of 37 objects. Altogether 25 objects were observed which span a large range of redshifts (up to $z=1.34$) with 12 objects having $z>0.5$. In addition,
H. Pietilä +5 more
core +1 more source
Millimetre observations of X-Ray Bl-Lacertae
, 1993 I present the first 1.3-mm observations of a complete sample of 10 X-ray- selected BL Lacertae objects (XBLs), together with complementary measurements of a complete sample of nine radio-selected BL Lacs (RBLs).
Gear, Walter Kieran
core +6 more sources
Is BL Lacertae an “orphan” AGN?
, 2010 Aims. We have analysed optical spectra of BL Lacertae, the prototype of its blazar subclass, to verify the broad Hα emission line detected more than a decade ago and its possible flux variation. We used the spectroscopic information to investigate the
C. M. Raiteri +2 more
core +1 more source
The Cosmological Evolution of BL Lacertae Objects
, 2000 We review the main results from several radio, X-ray and multi-frequency surveys on the topic of cosmological evolution of BL Lacertae objects. Updated findings on BL Lac evolution following the recent identification of many sources in the ``Sedentary Multi-Frequency survey'' are also discussed.
Giommi, P. +3 more
openaire +2 more sources
Multiwavelength Variability and Jet Properties of Low-synchrotron-peaked BL Lacertae Objects
The Astrophysical JournalLow-synchrotron-peaked BL Lac objects (LBLs) are promising candidates for masquerading BL Lacs, and the mechanism responsible for their high-energy γ -ray emission still requires further investigation.
R. X. Zhou +4 more
doaj +1 more source
Multi-messenger emission characteristics of blazars
Frontiers in Astronomy and Space SciencesMulti-messenger observations and theories of astrophysical objects are rapidly becoming a critical research area in the astrophysics scientific community. In particular, point-like objects such as BL Lacertae (BL Lac) objects, flat-spectrum radio quasars
Ronald Gamble +10 more
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