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Radio-Optical Analysis of Extended Radio Sources in the First Look Survey Field

Published online by Cambridge University Press:  03 June 2010

C. M. Paulo ,
I. Prandoni ,
R. Morganti  and
C. M. Cress
C. M. Paulo
Affiliation:
University of the Western Cape, Department of Physics, Bellvile, 7535, South Africa
I. Prandoni
Affiliation:
INAF-Instituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy
R. Morganti
Affiliation:
ASTRON, Postbus 2, 7990 AA, Dwingwloo, The Netherlands
C. M. Cress
Affiliation:
University of the Western Cape, Department of Physics, Bellvile, 7535, South Africa
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We combine 610 MHz GMRT data, 1.4 GHz VLA data, and 1.4 GHz WSRT observations, encompassing a ~ 4 square degree field centered on the verification strip of the Spitzer First Look Survey field, to study radio sources down to fluxes of about 0.1 mJy. The spectral index (Figure 1) analysis shows that the majority of multi-component sources are steep-spectrum sources. Nevertheless the spread in the spectral distribution is wide, with a significant number of ultra-steep, flat or inverted sources, possibly indicating a wider range of accretion modes in fainter samples. By cross-correlating 107 multi-component radio sources with the optical catalogues of Marleau et al. (2007) and Papovich et al. (2006), 23 objects were identified.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S267: Co-Evolution of Central Black Holes and Galaxies , August 2009 , pp. 131
Copyright
Copyright © International Astronomical Union 2010

References

Papovich, C., Cool, R., Eisenstein, D., Le Floc'h, E., Fan, X., Kennicutt, R. C. Jr., Smith, J. T. D., Rieke, G. H., & Vestergaard, M. 2006, AJ, 132, 231CrossRefGoogle Scholar
Marleau, F. R., Fadda, D., Appleton, P. N., Noriega-Crespo, A., Im, M., & Clancy, D. 2007, ApJ, 663, 218CrossRefGoogle Scholar