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Relativistic beaming and gamma-ray brightness of blazars

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Relativistic beaming and gamma-ray brightness of blazars

dc.contributor.author	Ros Ibarra, Eduardo
dc.contributor.author	Savolainen, Tuomas
dc.contributor.author	Homan, Daniel C.
dc.contributor.author	Hovatta, Talvikki
dc.contributor.author	Kadler, Matthias
dc.contributor.author	Kovalev, Yuri Y.
dc.contributor.author	Lister, Matthiew L.
dc.contributor.author	Zensus, J. Anton
dc.date.accessioned	2010-06-08T10:59:46Z
dc.date.available	2010-06-08T10:59:46Z
dc.date.issued	2010
dc.identifier.citation	SAVOLAINEN, Tuomas; HOMAN, Daniel C.; HOVATTA, Talvikki; KADLER, Matthias; KOVALEV, Yuri Y., LISTER, Matthiew L., ROS IBARRA, Eduardo and ZENSUS, J. Anton (2010): Relativistic beaming and gamma-ray brightness of blazars, astronomy and astrophysics, vol. 512, núm. 4	en
dc.identifier.uri	http://hdl.handle.net/10550/12912
dc.description.abstract	Aims. We investigate the dependence of γ-ray brightness of blazars on intrinsic properties of their parsec-scale radio jets and the implication for relativistic beaming. Methods. By combining apparent jet speeds derived from high-resolution VLBA images from the MOJAVE program with millimetre- wavelength flux density monitoring data from Metsähovi Radio Observatory, we estimate the jet Doppler factors, Lorentz factors, and viewing angles for a sample of 62 blazars. We study the trends in these quantities between the sources which were detected in γ-rays by the Fermi Large Area Telescope (LAT) during its first three months of science operations and those which were not detected. Results. The LAT-detected blazars have on average higher Doppler factors than non-LAT-detected blazars, as has been implied indirectly in several earlier studies. We find statistically significant differences in the viewing angle distributions between γ-ray bright and weak sources. Most interestingly, γ-ray bright blazars have a distribution of comoving frame viewing angles that is significantly narrower than that of γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at large comoving frame viewing angles can be explained by relativistic beaming of γ-rays, while the apparent lack of γ-ray bright blazars at small comoving frame viewing angles, if confirmed with larger samples, may suggest an intrinsic anisotropy or Lorentz factor dependence of the γ-ray emission.	en
dc.language.iso	en	en
dc.subject	galaxies: active; ; ; BL Lacertae objects : general	en
dc.subject	galaxies: jets
dc.subject	quasars: general
dc.subject	BL Lacertae objects
dc.title	Relativistic beaming and gamma-ray brightness of blazars	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Galaxias	en
dc.identifier.doi	10.1051/0004-6361/200913740	en
dc.identifier.idgrec	054040	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361/200913740	en