Pulsars, transients and relativistic astrophysics

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Circinus X-1: survivor of a highly asymmetric supernova

(1999)

Authors:

TM Tauris, RP Fender, EPJ van den Heuvel, HM Johnston, K Wu

Low-Luminosity States of the Black Hole Candidate GX 339–4. I. ASCA and Simultaneous Radio/RXTE Observations

The Astrophysical Journal American Astronomical Society 522:1 (1999) 460-475

Authors:

Jörn Wilms, Michael A Nowak, James B Dove, Robert P Fender, Tiziana Di Matteo

On the Dynamical Foundations of α Disks

The Astrophysical Journal American Astronomical Society 521:2 (1999) 650-658

Authors:

Steven A Balbus, John CB Papaloizou

No evidence for a `redshift cut-off' for the most powerful classical double radio sources

(1999)

Authors:

Matt J Jarvis, Steve Rawlings, Chris J Willott, Katherine M Blundell, Steve Eales, Mark Lacy

Quasars from the 7C survey - I. Sample selection and radio maps

Monthly Notices of the Royal Astronomical Society 307:2 (1999) 293-314

Authors:

JM Riley, S Rawlings, RG McMahon, KM Blundell, P Miller, M Lacy, EM Waldram

Abstract:

We describe the selection of candidate radio-loud quasars obtained by cross-matching radio source positions from the low-frequency (151-MHz) 7C survey with optical positions from five pairs of EO POSS-I plates scanned with the Cambridge Automatic Plate-measuring Machine (APM). The sky region studied is centred at RA 10h 28m, Dec.+41° and covers ≈0.057 sr. We present VLA observations of the quasar candidates, and tabulate various properties derived from the radio maps. We discuss the selection criteria of the resulting '7CQ' sample of radio-loud quasars. The 70 confirmed quasars, and some fraction of the 36 unconfirmed candidates, constitute a filtered sample with the following selection criteria: 151-MHz flux density S151 > 100 mJy; POSS-I E-plate magnitude E ≈ R < 20; POSS-I colour (O - E) < 1.8; the effective area of the survey drops significantly below S151 ≈ 200 mJy. We argue that the colour criterion excludes few if any quasars, but note, on the basis of recent work by Willott et al., that the E magnitude limit probably excludes more than 50 per cent of the radio-loud quasars.