The original Parkes Radio Catalogue was compiled from major radio surveys with the Parkes radiotelescope at frequencies of 408 MHz and 2700 MHz. This work spanned a period of nearly 20 years and was undertaken largely by John Bolton and his colleagues. Since then, improved positions, optical identifications, and redshifts have been obtained for many of the sources in the Catalogue. Furthermore, flux densities at several frequencies have supplemented the original surveys so that the measurements now cover the frequency range 80-22,000 MHz. However, coverage at the highest frequencies is still sparse.
Important contributions to the usefulness of the Catalogue have been radio data from the Molonglo 408 MHz survey and the 80 MHz Culgoora measurements of Slee et al. PKSCAT90 should thus be regarded as a compendium of radio and optical data about southern radiosources. However, at the moment, it contains only sources originally found in the Parkes 2700 MHz Survey (see e.g. Part 14, Bolton et al, 1979, Aust J Phys, Astrophys Suppl, No. 46 and references therein.)
The original radio survey data of the Catalogue and the optical identifications have been published in a series of papers in the Australian Journal of Physics (see above reference). The associated optical spectral data on which redshifts were obtained has also been published, mainly in Astrophysical Journal and Monthly Notices of the Royal Astronomical Society.
About the completeness levels of the Catalogue in various parts of the sky: users should note that the sky zone between -4 and +4 degrees has been the subject of a re-survey and is now complete to 0.25 Jy.
The Parkes 2700 MHz Survey (see, e.g., Part 14, Bolton et al, 1979, Aust J Phys, Astrophys Suppl, No. 46 and references therein)
Code Description Old Code Identified Sources: BLC BL Lacertae object BLC D Diffuse galaxy, bright galaxies in clusters D DB Double galaxy DB E Elliptical Galaxy E G Galaxy too faint to classify G HII HII region HII IRR Irregular object IRR N N galaxy, bright cored galaxy N PN Planetary Nebular PN Q Quasi-stellar object or Quasar (confirmed) Q QC Quasar with a continuous optical spectrum QC S Spiral galaxy S SB Barred Spiral galaxy SB Sc Spiral galaxy (type C) SC SNR SuperNova Remnant SNR S0 Spiral galaxy with ellipticity of zero S0 (nearly circular) * Stellar object of neutral colour IIIS in good positional agreement with the radio source Unidentified Sources: Xg one or more galaxies in the area II covered by the position error of the source but no identification claimed Xs blank field: one or more stars of normal colour III in the error box Xsa blank field: obscured by absorption IIIA X blank field: no absorption apparent IIIB Xs+ blank field: crowded star field IIIC Xa blank field: heavily obscured. IV NOTE: a '?' following any code specifies that that property is uncertain.
The J2000 names are given as:
J1229+0203where the letter signifies J2000 equinox and equator (FK5-type position), the next 4 digits are the hours and minutes of right ascension and the sign and final digits are the degrees and minutes of declination.
Thus, the source 3C273 in the new system will be referred to as: PKSB1226+023 or PKSJ1229+0203 if the observatory designation is important or, more informally, B1226+023 or J1229+0203
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