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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 421667.0, MPI für Astronomie / Publikationen_mpia
Deep extragalactic VLBI-optical survey (DEVOS). II. Efficient VLBI detection of SDSS quasars
Authors:Frey, S.; Gurvits, L. I.; Paragi, Z.; Mosoni, L.; Garrett, M. A.; Garrington, S. T.
Language:English
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Astronomy and Astrophysics
Volume:477
Start Page:781
End Page:787
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Context: The Deep Extragalactic VLBI-Optical Survey (DEVOS) aims at constructing a large sample of compact radio sources up to two orders of magnitude fainter than those studied in other Very Long Baseline Interferometry (VLBI) surveys. Optical identification of the objects is ensured by selecting them from the Sloan Digital Sky Survey (SDSS) list. Aims: While continuing to build up the DEVOS data base, we investigated how the VLBI detection rate could be enhanced by refining the initial selection criteria introduced in the first paper of this series. Methods: We observed 26 sources in two adjacent, slightly overlapping 2°-radius fields with the European VLBI Network (EVN) at 5 GHz frequency on 2 March 2007. The phase-reference calibrator quasars were J1616+3621 and J1623+3909. The objects selected were unresolved both in the Faint Images of the Radio Sky at Twenty-centimeters (FIRST) survey catalogue and the SDSS Data Release 4. Results: We present images of milli-arcsecond (mas) scale radio structures and accurate coordinates of 24 extragalactic sources. Most of them have never been imaged with VLBI. Twenty-two compact radio sources (85% of our initial sample) are considered as VLBI detections of the corresponding optical quasars in SDSS. We found an efficient way to identify quasars as potential VLBI targets with mas-scale compact radio stucture at >1 mJy level, based only on the FIRST and SDSS catalogue data by applying simple selection criteria. Table ? and Fig. ? are only available in electronic form at http://www.aanda.org
Free Keywords:techniques: interferometric; radio continuum: galaxies; galaxies: active; quasars: general; surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008A%26A...477..781... [ID No:1]
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