Spectra of southern QSO

Spectral indices distribution of 684 radio-sources identified as quasars by Veron-Cetty and Veron (1983) located at south of declination -10 degrees, are analyzed. The spectral indices studied are between frequencies 408 and 1410 MHz, 1410 and 2700 MHz, and 2700 and 5009 MHz. About 33% of the source...

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Autores principales: Cersósimo, Juan Carlos, Cintron Martinez, S., Lebron Santos, M., Quiniento, Z.M.
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1992
Materias:
Astronomía
Galaxia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/144889
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-144889
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
spellingShingle Astronomía
Galaxia
Cersósimo, Juan Carlos
Cintron Martinez, S.
Lebron Santos, M.
Quiniento, Z.M.
Spectra of southern QSO
topic_facet Astronomía
Galaxia
description Spectral indices distribution of 684 radio-sources identified as quasars by Veron-Cetty and Veron (1983) located at south of declination -10 degrees, are analyzed. The spectral indices studied are between frequencies 408 and 1410 MHz, 1410 and 2700 MHz, and 2700 and 5009 MHz. About 33% of the sources with spectral indices measured are normal steep spectra radio-sources. The distribution of spectral indices show significative energy loss between 1410 and 2700 MHz for about 15% of the sample. From the literature it is known that QSO radio spectra turn over near 1 GHz due to synchrotron self-absorption (Kapahi 1981, Peacock and Wall 1981, Downes et al. 1981). These radio-sources have attracted considerable attention because they seem to be associated with quasars of high redshift (Gopal-Krishna et al. 1983). From the present sample we found 17 GPS sources (2.4%). With these sources a total of 67 GPS sources are known.
format Articulo
Comunicacion
author Cersósimo, Juan Carlos
Cintron Martinez, S.
Lebron Santos, M.
Quiniento, Z.M.
author_facet Cersósimo, Juan Carlos
Cintron Martinez, S.
Lebron Santos, M.
Quiniento, Z.M.
author_sort Cersósimo, Juan Carlos
title Spectra of southern QSO
title_short Spectra of southern QSO
title_full Spectra of southern QSO
title_fullStr Spectra of southern QSO
title_full_unstemmed Spectra of southern QSO
title_sort spectra of southern qso
publishDate 1992
url http://sedici.unlp.edu.ar/handle/10915/144889
work_keys_str_mv AT cersosimojuancarlos spectraofsouthernqso
AT cintronmartinezs spectraofsouthernqso
AT lebronsantosm spectraofsouthernqso
AT quinientozm spectraofsouthernqso
bdutipo_str Repositorios
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