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...
Guardado en:
| Autores principales: | , , , |
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| Formato: | Articulo Comunicacion |
| Lenguaje: | Español |
| Publicado: |
1992
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/144889 |
| Aporte de: |
| Sumario: | 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. |
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