We present results of a complete radio follow-up obtained with the VLA and ATCA radio telescopes down to a 6-cm flux limit of about 0.3 mJy (3σ) of all the 147 X-ray sources detected in the BeppoSAX HELLAS survey. We found 53 X-ray/radio likely associations, corresponding to about one-third of the X-ray sample. Using the two-point spectral index αro=0.35 we divided all the HELLAS X-ray sources into radio-quiet and radio-loud. We have 26 sources classified as radio-loud objects, corresponding to 18 per cent of the HELLAS sample. In agreement with previous results, the identified radio-loud sources are associated mainly with Type 1 active galactic nuclei (AGNs) with L5-10kev>~1044erg/s, while all the identified Type 2 AGNs and emission-line galaxies are radio-quiet objects with L5-10kev<~1044erg/s.
Ciliegi, P., Vignali, C., Comastri, A., Fiore, F., LA FRANCA, F., Perola, G.C. (2003). BeppoSAX HELLAS survey. VI.
BeppoSAX HELLAS survey. VI
LA FRANCA, Fabio;
2003-01-01
Abstract
We present results of a complete radio follow-up obtained with the VLA and ATCA radio telescopes down to a 6-cm flux limit of about 0.3 mJy (3σ) of all the 147 X-ray sources detected in the BeppoSAX HELLAS survey. We found 53 X-ray/radio likely associations, corresponding to about one-third of the X-ray sample. Using the two-point spectral index αro=0.35 we divided all the HELLAS X-ray sources into radio-quiet and radio-loud. We have 26 sources classified as radio-loud objects, corresponding to 18 per cent of the HELLAS sample. In agreement with previous results, the identified radio-loud sources are associated mainly with Type 1 active galactic nuclei (AGNs) with L5-10kev>~1044erg/s, while all the identified Type 2 AGNs and emission-line galaxies are radio-quiet objects with L5-10kev<~1044erg/s.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
