Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..165v&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present multi-frequency radio observations at parsec--scale resolution of the elliptical galaxy IC4296. The associated radio galaxy, PKS 1333-33, is intermediate between FRI and FRII, with very extended radio jets, slightly asymmetric in brightness, and faint hot spots. ASCA and BeppoSAX X--ray observations of IC4296 showed an excess of hard emission with respect to the expected stellar contribution, suggesting the presence of a low luminosity AGN or an obscured nucleus. Recent Chandra observations have been able to reveal for the first time a bright (although partially absorbed) nucleus. The parsec--scale radio images and spectral properties support the idea that the radio core is active and efficient in feeding the large scale radio jets, while the observed X--ray nuclear properties (especially the low 2--10 keV luminosity level) are still to be explained. We use a Hubble constant H0 = 50 km s-1 Mpc-1, which implies 1 mas = 0.35 pc at the distance of PKS 1333-33. We assume S ∝ ν-α.
Comastri Andrea
Morganti Rafaella
Pellegrini Sara
Venturi Tiziana
Vignali Christian
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