Results 61 to 70 of about 34,519 (239)

Statistics of Cosmological Black Hole Jet Sources: Blazar Predictions for GLAST [PDF]

, 2006
A study of the statistics of cosmological black-hole jet sources is applied to EGRET blazar data, and predictions are made for GLAST. Black-hole jet sources are modeled as collimated relativistic plasma outflows with radiation beamed along the jet axis ...
Bade N., Charles D. Dermer, Gould R. J., Kuhr H., Mucke A., Padovani P.   +5 more
core   +2 more sources

Near infrared polarimetry of a sample of blazars*

EPJ Web of Conferences, 2013
Polarization variability is one of the most ubiquitous characteristic of blazars. Near infrared (NIR)polarization measurements of blazars are not common, contrary to the optical ones.
Pulido J. A. Acosta, Pereyra A., Agudo I., Agulli I., Carnerero M., Segura N. Castro, Gómez J.L., Jorstad S., Marscher A.   +8 more
doaj   +1 more source

Proton Synchrotron Gamma-Rays and the Energy Crisis in Blazars [PDF]

Astrophysical Journal, 2020
The origin of high-energy emission in blazars jets (i.e., leptonic versus hadronic) has been a longstanding matter of debate. Here, we focus on one variant of hadronic models where proton synchrotron radiation accounts for the observed steady γ-ray ...
I. Liodakis, M. Petropoulou
semanticscholar   +1 more source

Blazar Optical Variability in the Palomar-QUEST Survey [PDF]

, 2009
We study the ensemble optical variability of 276 FSRQs and 86 BL Lacs in the Palomar-QUEST Survey with the goal of searching for common fluctuation properties, examining the range of behavior across the sample, and characterizing the appearance of ...
Adelman-McCarthy, Anne Bauer, Baltay, Bauer, Bonning, Charles Baltay, Chatterjee, Cohen, Collier, Collinge, D'Arcangelo, David Rabinowitz, Fanaroff, Healey, Healey, Heidt, Jonathan Jerke, Kartaltepe, Kellermann, Li, Lister, Massaro, Monet, Nancy Ellman, Padovani, Paolo Coppi, Peterson, Richard Scalzo, Sowards-Emmerd, Vanden Berk   +29 more
core   +1 more source

Constraining the Limiting Brightness Temperature and Doppler Factors for the Largest Sample of Radio-bright Blazars [PDF]

Astrophysical Journal, 2018
Relativistic effects dominate the emission of blazar jets, complicating our understanding of their intrinsic properties. Although many methods have been proposed to account for them, the variability Doppler factor method has been shown to describe the ...
I. Liodakis, T. Hovatta, D. Huppenkothen, S. Kiehlmann, W. Max-Moerbeck, A. Readhead   +5 more
semanticscholar   +1 more source

Doppler Factor Estimation for Fermi Blazars

Astrophysical Journal, 2020
In this work, we exploit the luminosity of the broad-line region (BLR) for 50 Fermi blazars through matching the coordinates between the Sloan Digital Sky Survey catalog, Fermi Large Area Telescope Third Source Catalog, and the Fermi Large Area Telescope
Lixia Zhang, Sina Chen, H. Xiao, J. Cai, Junhui Fan   +4 more
semanticscholar   +1 more source

Probing High Redshift Radiation Fields with Gamma-Ray Absorption [PDF]

, 2000
The next generation of gamma-ray telescopes may be able to observe gamma-ray blazars at high redshift, possibly out to the epoch of reionization. The spectrum of such sources should exhibit an absorption edge due to pair-production against UV photons ...
Cheng K. S., Falcke H., S. Peng Oh, Sasaki S., Shaver P. A., von Montigny C.   +5 more
core   +5 more sources

On the Nature of MeV-blazars

, 2002
Broad-band spectra of the FSRQ (flat-spectrum-radio quasars) detected in the high energy gamma-ray band imply that there may be two types of such objects: those with steep gamma-ray spectra, hereafter called MeV-blazars, and those with flat gamma-ray ...
Baker J. C., Bell A. R., Blandford R. D., Bloemen H., Blom J. J., Blom J. J., Dieckmann M. E., G. M. Madejski, M. Błażejowski, M. Sikora, Mannheim K., McClements K. G., Pohl M., Polletta M., R. Moderski, Romanova M. M., Stacy J. G.   +16 more
core   +1 more source

Multi-messenger emission characteristics of blazars

Frontiers in Astronomy and Space Sciences
Multi-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, Ronald Gamble, Ronald Gamble, Jordan Forman, Amethyst Barnes, Gokul Srinivasaragavan, Gokul Srinivasaragavan, Isiah Holt, Isiah Holt, Marvin Jones, Marvin Jones   +10 more
doaj   +1 more source

Polarization Vector Rotations: Real, Spurious, Hidden and Imaginary

Galaxies, 2016
Large and variable polarization is an inherent property of a majority of blazars. Systematic rotations of the polarization vector have been claimed for several blazars. In some cases, however, the reality of these rotations may be questionable.
Valeri M. Larionov, Svetlana G. Jorstad, Alan P. Marscher, Paul S. Smith   +3 more
doaj   +1 more source