Results 41 to 50 of about 1,386,746 (158)

Characterizing Multiband Optical Emission and Variability of 1ES 1215+303 on Diverse Timescales

open access: yesThe Astrophysical Journal
This study presents analyses of the optical variability of the 1ES 1215+303 on diverse timescales using multiband observations, including observations in the optical BVRI bands carried out with the 0.6 and 1.0 m telescopes located at the Tübitak National
A. Ozdonmez   +6 more
doaj   +1 more source

Jet formation in BL Lacertae objects with different accretion modes

open access: yes, 2003
We estimate the masses of massive black holes in BL Lac objects from their host galaxy luminosity. The power of jets and central optical ionizing luminosity for a sample of BL Lac objects are derived from their extended radio emission and the narrow-line
Cao, XW, Xinwu Cao
core   +1 more source

Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164

open access: yesThe Astrophysical Journal Supplement Series, 2023
We present a long-term and intraday variability study of optical multiwaveband ( U BV RI ) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019).
Abhradeep Roy   +11 more
doaj   +1 more source

Detection of the distant quasar OP 313 with the first Large-Sized Telescope of CTAO

open access: yesAstronomy & Astrophysics
Context. Flat spectrum radio quasars (FSRQs) often remain undetected at very-high-energy (VHE, E > 100 GeV) γ rays due to their typically soft spectra and large distance.
Abe K.   +415 more
doaj   +1 more source

BL Lacertae Objects [PDF]

open access: yes, 1998
This grant has contributed to one of the original goals of the NAS/LTSA program, the goal of junior faculty development. Below I briefly summarize the following major results on BL Lacertae Objects that we have obtained. An invited talk on BL Lac Objects
Stocke, John T.
core  

The Energy Budget in the Jet of High-frequency Peaked BL Lacertae Objects

open access: yesThe Astrophysical Journal
Energy equipartition and the energy budget in the jet are important issues for the radiation mechanism of blazars. Early work predominantly concentrated on flat-spectrum radio quasars and a limited number of BL Lacertae (BL Lac) objects.
X. Z. Zhao   +3 more
doaj   +1 more source

Infrared Variation of Radio‐selected BL Lacertae Objects [PDF]

open access: yesThe Astrophysical Journal Supplement Series, 1999
27 page, 12 figures; 4 tables, ApJS, 121, 131 (1999)
Fan, J. H., Lin, R. G.
openaire   +2 more sources

Systematic Search for and Study of Short-timescale Flare Structures in BL Lac Object Gamma-Ray Emission

open access: yesThe Astrophysical Journal
We present here the first systematic search of short-timescale γ -ray flares from 29 high Galactic latitude BL Lac objects over 14 yr of Fermi Large Area Telescope data. Using a combined Bayesian Blocks and HOP algorithm, we identified seven high-quality
Jinjie Yu   +4 more
doaj   +1 more source

Very-high-energy gamma-ray intranight variability from BL Lacertae during the extreme flaring state of 2022

open access: yesAstronomy & Astrophysics
Context. BL Lacertae (BL Lac), the archetypal blazar of its subclass and one of the most studied blazars of recent decades, has undergone a series of major multi-wavelength outbursts since 2020, resulting in its highest recorded γ-ray flare to date ...
Abe K.   +298 more
doaj   +1 more source

The connection between black hole mass and Doppler boosted emission in BL Lacertae type objects [PDF]

open access: yes, 2011
We investigate the relationship between black hole mass (MBH) and Doppler boosted emission for BL Lacertae type objects (BL Lacs) detected in the Sloan Digital Sky Survey and Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) surveys.
Vahram Chavushyan   +1 more
core  

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