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Jodrell Bank Centre for Astrophysics

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THE 2014 REPROCESSED HASLAM MAP

An improved source-subtracted and destriped 408 MHz all-sky map

M. Remazeilles1, C. Dickinson1, A. J. Banday2, M.-A. Bigot-Sazy1, T. Ghosh3

1 Jodrell Bank Centre for Astrophysics, School of Physics & Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK

2 CNRS, IRAP, 9 Av. colonel Roche, BP 44346, F-31028 Toulouse cedex 4, France

3 Institut d'Astrophysique Spatiale, Université Paris-Sud 11, Orsay, France



The 2014 destriped and desourced 408 MHz all-sky map
Product Name             2014 reprocessed Haslam 408 MHz map

Coord. System               Galactic

Projection type               HEALPix, ring, Nside=512

Resolution                     56 arcmin

Original Data Source       Max Planck Institute for Radioastronomy Survey Sampler

DOWNLOAD THE 2014 HASLAM MAP HERE OR ON LAMBDA

For the complete list of dowloadable products, see the Table at the bottom of the page

  • A new desourced destriped version of the 408 MHz radio continuum all-sky map of Haslam et al, 1982 is supplied:

      • - We have performed a re-processing of the data downloaded from the Max Planck Institute for Radioastronomy Survey Sampler website to improve both the removal of strong baseline striping and the removal of strong extra-galactic radio sources in the Haslam map. In the 2014 Haslam map we get rid of the source residual artifacts that are still present in the LAMBDA post-processed 2003 version of the Haslam map (see Figure below). Note that we have attempted to retain the brightest Galactic sources in the map.

  • Three additional products are supplied:

      • - A high-resolution (Nside=2048, beam FWHM=0 arcmin) template of the desourced destriped 408 MHz all-sky map, in which small-scale fluctuations have been artificially added. This template is made available for the simulations of high resolution CMB and 21 cm intensity mapping experiments. Higher Nside maps with small-scales added are available on request from the authors.

      - A destriped-only version of the 408 MHz radio continuum all-sky map, with no desourcing.

      - A bitmask of the extra-galactic sources that have been subtracted. Each bit indicates the processing technique applied to the source (bit 0: Guassian fitting, bit 1: Inpainting).

  • Should you use the 2014 reprocessed Haslam map, please cite:

    • Remazeilles, M., Dickinson, C., Banday, A. J., Bigot-Sazy, M.-A., Ghosh, T.,
    "An improved source-subtracted and destriped 408 MHz all-sky map", MNRAS 451, 4311 (2015)



    Raw Haslam map (1982) centred on the Cygnus A radio source

    Raw Haslam map (1982) centred on the Cygnus A source.

    LAMBDA postprocessed Haslam map (2003): residual source artefacts are still visible due to imperfect desourcing

    LAMBDA postprocessed Haslam map (2003): residual source artefacts are still visible.


    Complete list of available products (also available on NASA's LAMBDA)
    Description File Info File Name

    Desourced and destriped Haslam 408 MHz all-sky map

    (main product, Nside=512, Beam FWHM=56 arcmin)

    12 MB

    FITS Hdr
    		 haslam408_dsds_Remazeilles2014.fits

    Desourced and destriped Haslam 408 MHz all-sky map with small scales

    (Nside=2048, Beam FWHM=0 arcmin)

    400 MB

    FITS Hdr
    		 haslam408_dsds_Remazeilles2014_ns2048.fits

    Destriped Haslam 408 MHz all-sky map

    (Nside=512, Beam FWHM=56 arcmin)

    12 MB

    FITS Hdr
    		 haslam408_ds_Remazeilles2014.fits
    Bitmask for the processed extra-galactic sources

    6 MB

    FITS Hdr
    		 haslam408_bitmask_Remazeilles2014.fits