Site Map
Contacts
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto

Stellar luminosities and radio structures of radio sources

E. Vardoulaki

Abstract
We present a near-infrared (K-band) study of two independent radio-source samples, the > 100 mJy 151-MHz radio-selected TOO at z ~ 1.25 and the > 2 mJy 1.4-GHz radio-selected SXDS radio sources at z ~ 1.1, and compare them to other samples from literature. We find that nearly all radio-luminous sources are associated with massive galaxies (~ 4 L* with a Gaussian spread of ~ 2 L*). There is a subtle correlation between location in this spread and radio luminosity understandable in the context of models in which radio luminosity reflects energy input into lobes via jets powered by processes associated with black hole accretion, with Eddington-limited accretion rate, black hole spin and radio source environment as the key cosmically-varying parameters. At all z, there is an additional sub-population of radio sources associated with sub-L* (non-massive) galaxies. They have jets confined to their host galaxies, at least some of which are well known Seyferts. Sources with extended FRI radio structures can, rarely, exceed the radio luminosities associated with the FRI/FRII break.

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina
(Eds.) I. Papadakis, A. Anastasiadis

Hellenic Astronomical Society
Page 20
2012

>> ADS

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website