Results 171 to 180 of about 2,377,761 (195)

Radio Luminosity Function of Flat-spectrum Radio Quasars [PDF]

Astrophysical Journal, 2017
We present the radio luminosity function (LF) of flat-spectrum radio quasars (FSRQ), using the the largest and most complete sample to date. Cross-matching between the FIRST 20 cm and GB6 6 cm radio surveys, we find 638 flat-spectrum radio sources above ...
Marco Landoni, Peiyuan Mao, Meg Urry
exaly   +6 more sources

On the black hole mass–radio luminosity relation for flat-spectrum radio-loud quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
A new analysis of the connection between black-hole mass and radio luminosity in radio-selected flat-spectrum quasars (FSQ) is presented. In contrast to recent claims in the literature, we find no evidence that the black-hole masses of radio-selected FSQ are systematically lower that those of luminous optically-selected radio-loud quasars.
Matt Jarvis, Ross J McLure
exaly   +3 more sources

Flat-spectrum radio quasars as high-energy neutrino sources

Astronomy and Astrophysics
The astrophysical sources responsible for the production of high-energy neutrinos remain largely uncertain. The strongest associations suggest a correlation between neutrinos and active galactic nuclei. However, it is still unclear which specific regions and mechanisms of the accreting supermassive black hole are responsible for ...
Alessandro Caccianiga, Alberto Moretti
exaly   +3 more sources

The transition between BL Lac objects and flat spectrum radio quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 2011
Giancarlo Ghirlanda, Luigi Foschini, Fabrizio Tavecchio   +2 more
exaly   +2 more sources

A comparison of the radio–submillimetre spectra of BL Lacertae objects and flat-spectrum radio quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 1994
We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude ...
Walter Gear, Margo Aller, D H Hughes
exaly   +4 more sources

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The Scale Invariant Synchrotron Jet of Flat Spectrum Radio Quasars

Journal of Astrophysics and Astronomy, 2015
In this paper, the scale invariance of the synchrotron jet of Flat Spectrum Radio Quasars has been studied using a sample of combined sources from FKM04 and from SDSS DR3 catalogue. Since the research of scale invariance has been focused on sub-Eddington cases that can be fitted onto the fundamental plane, while near-Eddington sources such as FSRQs ...
L. M. Du, J. M. Bai, Z. H. Xie, T. F. Yi, Y. B. Xu, R. Xue, X. H. Wang   +6 more
openaire   +1 more source

Relation between BL Lacertae Objects and Flat-Spectrum Radio Quasars

Astrophysical Journal, 2003
Blazars have two subclasses, namely, BL Lacertae objects and flat-spectrum radio quasars. The two subclasses share many similar observational properties, but their difference in emission lines cannot be ignored. What causes the difference? In this Letter, we propose a method to determine the intrinsic ratio, f, of the comoving luminosity in the jet to ...
exaly   +2 more sources

Classification Of Flat Spectrum Radio Quasars By Optical Activity Types

Astrophysics
We have carried out a spectral classification by the activity types for a subsample of blazars from the BZCAT v.5 Catalogue, namely the Flat Spectrum Radio Quasars (FSRQ) candidates, designated in the catalogue as BZQ subtype objects. The classification is based on the Sloan Digital Sky Survey (SDSS) homogeneous medium-resolution optical spectroscopy ...
A. M. Mickaelian, H. V. Abrahamyan, G. M. Paronyan, G. A. Mikayelyan, A. G. Sukiasyan, V. K. Mkrtchyan   +5 more
openaire   +1 more source

The optical variability properties of flat spectrum radio quasar 3C 454.3

New Astronomy, 2015
Abstract The optical variability and property of color index of the flat spectrum radio quasar object 3C 454.3 have been studied. The source exhibits strong variability both in intraday and long-term timescale. The χ 2 test suggests that 171 out of 285 nights in R band present intraday variability, and the typical intraday timescale is
Yao Zhou, Da-Hai Yan, Ben-Zhong Dai
openaire   +1 more source

Spectral Energy Distribution of Flat-Spectrum Radio Quasars observedwith bepposax

2002
cfr.
Tavecchio F., Maraschi L., Ghisellini G., Celotti A., Chiappetti L., Comastri A., Fossati G., Grandi P., Pian E., Tagliaferri G. Treves A., Sambruna R.   +10 more
openaire   +1 more source