On the origin of a universal power law in compact radio sources.

Details On the origin of a universal power law in compact radio sources. On the origin of a universal power law in compact radio sources.

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phys...51..287l&link_type=abstract

Physica Scripta, Vol. 51, No. 2, p. 287 - 288

Physics

1

Radio Sources: Relativistic Plasma, Bl Lacertae Objects: Relativistic Plasma

Scientific paper

A possible explanation for the reported "universal" electron energy exponent Γ ≅ -1.4, which corresponds to an optically thin spectral index α ≅ -0.2 (Sν ∝ να) is discussed. A comparison of Valtaoja's variability data with those of Wardle leads to the conclusion that compact, variable radio sources contain much more ultrarelativistic particles than thermal plasma. The shock compression ratio r in a relativistic plasma is 7 (instead of 4 in a nonrelativistic gas). r ≅ 7 results in an optically thin spectral index α ≅ -3/(2r - 2) = -0.25, quite close to the value indicated by the observations.

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