Mathematics – Logic
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7506t&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #75.06; Bulletin of the American Astronomical Society, Vol. 25, p.1409
Mathematics
Logic
Scientific paper
We present results from the second Caltech-Jodrell Bank VLBI survey (CJ2). This is a Mark 2 snapshot VLBI survey of flat- and peaked-spectrum sources. The CJ2 survey extends the morphological study of the Pearson & Readhead (1988, ApJ, 328, 114) and Caltech-Jodrell Bank (Polatidis et al. 1993, Xu et al. 1993 submitted to ApJ, hereafter CJ) surveys to 400 sources. The CJ2 survey has three cosmological goals: 1) to populate the proper motion--redshift diagram for superluminal sources; 2) to populate the size--redshift diagram for compact sources (both diagrams can be used to estimate the deceleration parameter, q_0); and 3) to search for small-separation gravitationally-lensed systems and hence to look directly for mass concentrations in the unexplored range of 10(6) - 10(9) \solmass. Approximately 10% of the sources are found to be interesting, unusual objects worth further study. The CJ2 sample is drawn from the Patnaik et al. (1992, MNRAS, 254, 655) list of ~ 900 compact flat-spectrum sources north of delta = 35° with 6 cm flux densities greater than 200 mJy. We have selected the strongest 197 of these sources subject to the further criteria that they are out of the galactic plane (|b| > 10°), flat-spectrum (alpha flatter than -0.5), and have not been previously observed in the PR or CJ surveys. All 197 sources have now been successfully imaged at 6 cm with ~ 1 mas resolution and a typical dynamic range of 500:1. The vast majority (171/197) of these sources have core-jet morphologies and are therefore well suited for the cosmological tests described above. Roughly 9% (18/197) are candidate compact symmetric objects. This group of sources is not well understood and is of considerable current interest (Readhead et al. 1993, ApJ, in press).
Browne Ian W. A.
Cohen Morrel H.
Henstock D. R.
Patnaik Alok
Pearson Timothy. J.
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