Results 81 to 90 of about 1,386,746 (158)
Hunting distant BL Lacertae objects with the photometric technique using Swift and SARA
, 2020 BL Lacertae objects represent a large fraction (22%) of γ-ray sources in the Third Fermi Large Area Telescope catalog (3FGL). Nearly half of the BL Lac object population remains without a redshift because of their featureless optical spectra.
Kaur, A. +7 more
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Revealing High-z Fermi-LAT BL Lacs Using Swift and SARA Data with Photometric Analysis
The Astrophysical JournalBL Lacertae (BL Lac) objects are a subclass of blazar, distinguished by their featureless optical spectrum. The featureless spectrum presents a challenge in measuring the redshift of the BL Lacs.
Y. Sheng +14 more
doaj +1 more source
BL Lacertae Objects: A Short Review
Communications of the Byurakan Astrophysical Observatory, 2019 BL Lacertae objects (BLLs) constitute a class of active galactic nuclei (AGNs) with extreme observational features explained by non-thermal radiation from a relativistic jet nearly pointed along the observer’s line-of-sight. Their spectral energy distribution (SED), extending over 17-19 orders of the frequency, is of non-thermal origin and shows a ...
openaire +1 more source
Investigating Optical Variability of the Blazar S5 0716+714 on Diverse Timescales
The Astrophysical JournalWe present the results of the observational study of the blazar S5 0716+716 in the optical bands B , V , R , and I between 2019 March and 2023 August to investigate its variability on diverse timescales.
Ergün Ege +3 more
doaj +1 more source
UniverseBL Lacertae is not only archetypical of an entire class of jet-dominated active galactic nuclei, blazars, but also one of the most active and rapidly changing objects in this class.
Rumen Bachev +3 more
doaj +1 more source
Multifrequency observations of a sample of very low frequency peaked BL Lacertae objects
, 2010 Context. BL Lacertae objects with an extremely low value of the peak frequency (v(s)
A. Maselli +10 more
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HST Observations of the Host Galaxies of BL Lacertae Objects
, 1998 23 pages, including 6 postscript figures and 3 tables (embedded). Latex requires aaspp4.sty and psfig.sty (not included).
URRY C. M. +5 more
openaire +3 more sources
From Equipartition to Curvature: The Spectral Evolution of 4FGL Blazars
The Astrophysical Journal Supplement SeriesWe investigate the evolution of spectral energy distribution (SED) and underlying electron energy distribution (EED) by modeling the nearly simultaneous broadband spectra of selected bright 4FGL blazars, in the context of a combined cooling and ...
Muhammad S. Anjum +4 more
doaj +1 more source
Optical observations of eight X-ray selected BL Lacertae objects
, 1998 We present optical data in the Johnson's BV and Cousins' R bands for eight X-ray selected BL Lacertae objects (BL Lacs) that have recently been pointed by the Satellite per Astronomia X "Beppo" (BeppoSAX).
C. M. Raiteri +5 more
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X-ray selected BL Lacertae objects: catalogue and statistical properties [PDF]
, 2012 The present work focuses on the statistical properties of X-ray selected BL Lacertae objects (XBLs) whose catalogue has been compiled. It consists of 312 sources from different X-ray surveys, unambiguously identified to mid-2010.
Kapanadze, B.Z.
core +1 more source