DSpace
 

RRI Digital Repository >
04. Astronomy and Astrophysics >
Research Papers (A&A) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1590

Title: Relativistic beaming effects in the spectra of cores and hotspots in radio galaxies and quasars
Authors: Ishwara-Chandra, C.H.
Saikia, D.J.
Keywords: GALAXIES: ACTIVE
GALAXIES: NUCLEI
QUASARS: GENERAL
RADIO CONTINUUM: GALAXIES
Issue Date: Sep-2000
Publisher: Blackwell Publishing for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2000, Vol.317, p658-666.
Abstract: We present the results of multiwavelength observations of cores and hotspots, at L, C, X and U bands with the Very Large Array, of a matched sample of radio galaxies and quasars selected from the Molonglo Reference Catalogue. We use these observations to determine the spectra of cores and hotspots, and test the unified scheme for radio galaxies and quasars. Radio cores have been detected at all wavelengths in all of the quasars in our sample, whereas only ~50per cent of the galaxies have cores detected in at least one of the wavelengths. The degree of core prominence in this sample is consistent with the unified scheme for radio galaxies and quasars. A comparison of the distributions of the two-point spectral index of the cores in our sample of lobe-dominated quasars, with the distributions in a matched sample of core-dominated quasars, shows that the distributions for these two classes are significantly different, and this is consistent with the expectations of the unified scheme. The difference in the spectral indices of the two hotspots on opposite sides is also significantly larger for quasars than for radio galaxies, as is expected in the unified scheme. We also investigate the relationship between the spectral index of the hotspots and the redshift or luminosity for our sample of sources.
Description: Sorry, the full text of this article is not available here. Please click on the alternative location to access it.
URI: http://hdl.handle.net/2289/1590
ISSN: 0035-8711
Alternative Location: http://adsabs.harvard.edu/cgi-bin/bib_query?2000MNRAS.317..658I
http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000MNRAS.317..658I&link_type=ARTICLE&db_key=AST
http://arxiv.org/abs/astro-ph/0005392
Copyright: (2000) Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

Files in This Item:

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace