A southern-sky total intensity source catalogue at 2.3 GHz from S-band Polarisation All-Sky Survey data

Abstract

The S-band Polarisation All-Sky Survey (S-PASS) has observed the entire southern sky using the 64-metre Parkes radio telescope at 2.3GHz with an effective bandwidth of 184MHz. The surveyed sky area covers all declinations $\delta \le 0^{\circ }$. To analyse compact sources the survey data have been re-processed to produce a set of 107 Stokes $I$ maps with 10.75arcmin resolution and the large scale emission contribution filtered out. In this paper we use these Stokes $I$ images to create a total intensity southern-sky extragalactic source catalogue at 2.3GHz. The source catalogue contains 23,389 sources and covers a sky area of 16,600deg${}^2$, excluding the Galactic plane for latitudes $|b|<10^{\circ }$. Approximately 8% of catalogued sources are resolved. S-PASS source positions are typically accurate to within 35arcsec. At a flux density of 225mJy the S-PASS source catalogue is more than 95% complete, and $\sim$94% of S-PASS sources brighter than 500mJy beam${}^{-1}$ have a counterpart at lower frequencies.

11 pages, 8 figures, 2 tables, accepted for publication in PASA, corrected typos, updated references

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