GASS: The Parkes Galactic all-sky survey: II. Stray-radiation correction and second data release

P. M.W. Kalberla, N. M. McClure-Griffiths, D. J. Pisano, M. R. Calabretta, H. Alyson Ford, F. J. Lockman, L. Staveley-Smith, J. Kerp, B. Winkel, T. Murphy, K. Newton-McGee

Research output: Contribution to journalArticlepeer-review

148 Scopus citations


Context. The Parkes Galactic all-sky survey (GASS) is a survey of Galactic atomic hydrogen (Hi) emission in the southern sky observed with the Parkes 64-m Radio Telescope. The first data release was published by McClure-Griffiths et al. (2009). Aims.We remove instrumental effects that affect the GASS and present the second data release. Methods.We calculate the stray-radiation by convolving the all-sky response of the Parkes antenna with the brightness temperature distribution from the Leiden/Argentine/Bonn (LAB) all sky 21-cm line survey, with major contributions from the 30-m dish of the Instituto Argentino de Radioastronomía (IAR) in the southern sky. Remaining instrumental baselines are corrected using the LAB data for a first guess of emission-free baseline regions. Radio frequency interference is removed by median filtering. Results.After applying these corrections to the GASS we find an excellent agreement with the Leiden/Argentine/Bonn (LAB) survey. The GASS is the highest spatial resolution, most sensitive, and is currently the most accurate Hi survey of the Galactic Hi emission in the southern sky. We provide a web interface for generation and download of FITS cubes.

Original languageEnglish (US)
Article numberA17
JournalAstronomy and astrophysics
Issue number2
StatePublished - Oct 14 2010
Externally publishedYes


  • Galaxy: structure
  • ISM: general
  • radio lines: ISM
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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