NAGIOS: RODERIC FUNCIONANDO

MOJAVE. XII. Acceleration and Collimation of Blazar Jets on Parsec Scales

Repositori DSpace/Manakin

IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

MOJAVE. XII. Acceleration and Collimation of Blazar Jets on Parsec Scales

dc.contributor.author	Homan, Daniel C.
dc.contributor.author	Lister, Matthiew L.
dc.contributor.author	Kovalev, Yuri Y.
dc.contributor.author	Pushkarev, A. B.
dc.contributor.author	Savolainen, Tuomas
dc.contributor.author	Kellermann, K. I.
dc.contributor.author	Richards, J. L.
dc.contributor.author	Ros Ibarra, Eduardo
dc.date.accessioned	2015-05-15T11:03:01Z
dc.date.available	2015-05-15T11:03:01Z
dc.date.issued	2015
dc.identifier.citation	Homan, Daniel C. Lister, M. L. Kovalev, Y. Y. Pushkarev, A. B. Savolainen, T. Kellermann, K. I. Richards, J. L. Ros Ibarra, Eduardo 2015 MOJAVE. XII. Acceleration and Collimation of Blazar Jets on Parsec Scales Astrophysical Journal 798 134 1 16
dc.identifier.uri	http://hdl.handle.net/10550/43878
dc.description.abstract	We report on the acceleration properties of 329 features in 95 blazar jets from the MOJAVE Very Long Baseline Array program. Nearly half the features and three-quarters of the jets show significant changes in speed and/or direction. In general, apparent speed changes are distinctly larger than changes in direction, indicating that changes in the Lorentz factors of jet features dominate the observed speed changes rather than bends along the line of sight. Observed accelerations tend to increase the speed of features near the jet base, lsim 10-20 pc projected, and decrease their speed at longer distances. The range of apparent speeds at a fixed distance in an individual jet can span a factor of a few, indicating that shock properties and geometry may influence the apparent motions; however, we suggest that the broad trend of jet features increasing their speed near the origin is due to an overall acceleration of the jet flow out to deprojected distances of the order of 102 pc, beyond which the flow begins to decelerate or remains nearly constant in speed. We estimate intrinsic rates of change of the Lorentz factors in the galaxy frame of the order of $\dot{\Gamma }/\Gamma \simeq 10^{-3}$ to 10¿2 yr¿1, which can lead to total Lorentz factor changes of a factor of a few on the length scales observed here. Finally, we also find evidence for jet collimation at projected distances of lsim 10 pc in the form of the non-radial motion and bending accelerations that tend to better align features with the inner jet.
dc.language.iso	eng
dc.relation.ispartof	Astrophysical Journal, 2015, vol. 798, num. 134, p. 1-16
dc.subject	Astrofísica
dc.subject	Astronomia
dc.title	MOJAVE. XII. Acceleration and Collimation of Blazar Jets on Parsec Scales
dc.type	journal article	es_ES
dc.date.updated	2015-05-15T11:03:02Z
dc.identifier.doi	10.1088/0004-637X/798/2/134
dc.identifier.idgrec	100892
dc.rights.accessRights	open access	es_ES