NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T04:46:20 PDT
Help | Comment | NED Home

For refcode 2012ApJ...744...31G:
Retrieve 31 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...744...31G On the Injection Spectrum of Relativistic Electrons in High-redshift Radio Galaxies Gopal-Krishna; Mhaskey, Mukul; Mangalam, A. Abstract. We point out that the remarkable linearity of the ultra-steep radio spectra of high-redshift radio galaxies reflects a previously reported general trend for powerful radio galaxies, according to which the spectral curvature is less for sources having steeper spectra (measured near rest-frame 1 GHz). We argue based on existing theoretical and observational evidence that it is premature to conclude that the particle acceleration mechanism in sources having straight, ultra-steep radio spectra gives rise to an ultra-steep injection spectrum of the radiating electrons. In empirical support for this we show that the estimated injection spectral indices available for a representative sample of 35 compact steep spectrum radio sources are not correlated with their rest-frame (intrinsic) rotation measures, which are known to be typically large, indicating a dense environment, as is also the case for high-z radio galaxies. Key words: galaxies: active, galaxies: clusters: intracluster medium, galaxies: high-redshift, galaxies: ISM, galaxies: jets, radio continuum: galaxies
Retrieve 31 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home