Results 11 to 20 of about 2,377,761 (195)
Flat-spectrum radio quasars from the SDSS DR3 quasar catalogue [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We constructed a sample of 185 flat-spectrum radio quasars (FSRQs) by cross-correlating Shen et al.'s Sloan Digital Sky Survey Data Release 3 (SDSS DR3) X-ray quasar sample with the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) and Green ...
Chen, Zhaoyu, Gu, Minfeng, Cao, Xinwu
core +3 more sources
The Gamma-Ray Luminosity Function of Flat-spectrum Radio Quasars
The Astrophysical JournalWe have utilized the largest sample of gamma-ray-selected Fermi flat-spectrum radio quasars (FSRQs) ever used (519 sources) to construct the luminosity function and its evolution through cosmic history. In addition to spanning large redshift (0
Garima Rajguru +4 more
doaj +5 more sources
M-BH-Sigma relation in Sloan Digital Sky Survey flat-spectrum radio quasars [PDF]
, 2009 The relationship between the black hole mass and velocity dispersion indicated with [O iii] linewidth is investigated for a sample of 87 flat-spectrum radio quasars selected from the Sloan Digital Sky Survey Data Release 3 quasar catalogue. We found that
Chen, Zhaoyu +5 more
core +3 more sources
The Detection of Teraelectronvolt Radiation from a Flat-spectrum Radio Quasar
The Astrophysical Journal LettersThe very high-energy (VHE; >100 GeV) radiation carries the signatures of the matter–energy interaction in some of the most extreme astrophysical environments.
Vaidehi S. Paliya +7 more
doaj +3 more sources
Blue Fermi Flat Spectrum Radio Quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 Many blazars detected by the Fermi satellite, observed spectroscopically in the optical, are line-less, and have been classified as BL Lac objects. Optical-UV photometry of nearly one hundred of them allowed to determine the redshift for a handful of objects and redshift upper limits for the great majority.
GHISELLINI, GABRIELE +5 more
openaire +3 more sources
Magnetic field amplification and flat spectrum radio quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We perform time-dependent, spatially-resolved simulations of blazar emission to evaluate several flaring scenarios related to magnetic-field amplification and enhanced particle acceleration. The code explicitly accounts for light-travel-time effects and is applied to flares observed in the flat spectrum radio quasar (FSRQ) PKS 0208-512, which show ...
Chen, Xuhui +12 more
openaire +7 more sources
Multiwavelength observations of flat radio spectrum quasars and active galaxies
, 1993 Recent results from the Compton Gamma-Ray Observatory (CGRO) show that all of the gamma-ray detected quasars and active galaxies (AGN) are radio-loud. These discoveries, and previous statistical studies with results from the Einstein Observatory suggest ...
Marscher, A. P. +2 more
core +6 more sources
The Physical Properties of Fermi-4LAC Flat Spectrum Radio Quasars [PDF]
The Astrophysical Journal Supplement Series, 2020 Abstract In this work, we collect quasi-simultaneous infrared, optical, X-ray and γ-ray data of 60 Fermi fourth LAT AGN catalog (4LAC) flat spectrum radio quasars (FSRQs). In the framework of the conventional one-zone leptonic model, we investigate the physical properties of Fermi-4LAC FSRQs’ jets by modeling their quasi-simultaneous ...
Can Tan +5 more
openaire +2 more sources
Synchrotron X-ray Emission from Flat-spectrum Radio Quasars
, 2003 We present new BeppoSAX observations of four flat-spectrum radio quasars (FSRQ) with spectral energy distributions similar to those of high-energy peaked BL Lacs. In one of our sources the BeppoSAX band is dominated by synchrotron emission peaking at ∼ 2
Perlman, E. +4 more
core +3 more sources
TIME DEPENDENT HADRONIC MODELING OF FLAT SPECTRUM RADIO QUASARS [PDF]
The Astrophysical Journal, 2015 Accepted for publication in The Astrophysical ...
Diltz, C., Böttcher, M., Fossati, G.
openaire +4 more sources