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README.md

vphas-bandmerge-standalone

Standalone script that converts reduced VPHAS+ source lists obtained from the ESO archive into bandmerged catalogues.

Prerequisites:

  • numpy (v1.9 or greater)

  • astropy (v0.3 or greater)

  • Java

Either a list of files, or a directory path which contains only the files to be bandmerged should be provided.

The script produces single-band catalogues prior to the bandmerging, which can be kept by using the -k flag.

The radii of apertures used to measure flux from VPHAS+ images are defined relative to a "core" radius of 1 arcsecond. For apertures 1-7 the radii are:

  • 1 : 1/2 * rcore
  • 2 : 1/sqrt(2) * rcore
  • 3 : rcore
  • 4 : sqrt(2) * rcore
  • 5 : 2 * rcore
  • 6 : 2*sqrt(2) * rcore
  • 7 : 4 * rcore
    By default, magnitudes corresponding to the flux measured in aperture 3 are returned.

The crossmatching radius determines the maximum distance (in arcsec) between two sources in different filters before they will not be associated.

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Standalone script that converts reduced VPHAS+ source lists obtained from the ESO archive into bandmerged catalogues.

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