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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198317.0, MPI für Astronomie / Publikationen_mpia
In-situ particle acceleration in extragalactic
radio hot spots: observations meet expectations
Authors:Brunetti, G.; Mack, K.-H.; Prieto, M. Almudena; Varano, S.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Volume:345
Start Page:L40
End Page:L44
Review Status:not specified
Audience:Not Specified
Abstract / Description:We discuss, in terms of particle acceleration,
the results from optical VLT observations of hot
spots associated with radio galaxies. On the
basis of observational and theoretical grounds,
the following is shown. (i) Relatively low
radio-radio power hot spots are the optimum
candidates for being detected at optical waves.
This is supported by an unprecedented optical
detection rate of 70 per cent out of a sample of
low radio power hot spots. (ii) The shape of the
synchrotron spectrum of hot spots is mainly
determined by the strength of the magnetic field
in the region. In particular, the break
frequency, related to the age of the oldest
electrons in the hot spots, is found to increase
with decreasing synchrotron power and magnetic
field strength. Both observational results are
in agreement with an in-situ particle
acceleration scenario.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Gobetti 101, I-40129 Bologna, Italy), AB(ASTRON,
Postbus 2, NL-7990 AA Dwingeloo, the Netherlands;
Radioastronomisches Institut der
Universit auml;t Bonn, Auf dem H uuml;gel 71,
D-53121 Bonn, Germany), AC(Max-Planck-Institut
f uuml;r Astronomie, K ouml;nigstuhl 17,
D-69117 Heidelberg, Germany), AD(Dipartimento di
Astronomia, Universit agrave; di Bologna, Via
Ranzani 1, I-40127 Bologna, Italy; Istituto di
Radioastronomia del CNR, Via Gobetti 101, I-40129
Bologna, Italy)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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