The Nature of the Optically Faint Sub-Millijansky Radio Sources:. the Vlt/vimos View

Details The Nature of the Optically Faint Sub-Millijansky Radio Sources:. the Vlt/vimos View The Nature of the Optically Faint Sub-Millijansky Radio Sources:. the Vlt/vimos View

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pmpa.conf...75s&link_type=abstract

2005: PAST MEETS PRESENT IN ASTRONOMY AND ASTROPHYSICS. Proceedings of the 15th Portuguese National Meeting. Held 28-30 July 200

Astronomy and Astrophysics

Astrophysics

Scientific paper

The aim of this study is to characterize the optically faint submillijansky (sub-mJy) radio population, exploring its nature and evolution, and thus to complete recent studies which have successfully done this for optically bright sources. In order to achieve this, the VLT/VIMOS was used to obtain spectra of several tens of galaxies that are part of the Phoenix Deep Survey (PDS), a multiwavelength survey based on deep 1.4 Ghz radio imaging, reaching well into the sub-100 μJy level. The analysis of the first set of observations reveal 32 sources with a secure redshift determination having optical magnitudes 19 ≤ R ≤ 24 mag. Of these, 34% are star-forming galaxies, 22% are identified as Seyfert galaxies, showing active galactic nucleus signatures, 6% have absorption lines only, and the remaining 38% show narrow lines that do not allow detailed spectral classification (mainly because they are at high redshifts, or due to spectrum with poor signal-to-noise ratio). On the other hand, the sample considered in this study clearly indicates that optically faint (R ≥ 19 mag) sub-mJy radio sources tend to be at higher redshifts, and have fainter radio fluxes, a result which confirms indications from previous work.

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