filter_transform

stellarphot.utils.filter_transform(mag_data, output_filter, g=None, r=None, i=None, transform=None)

Transform SDSS magnitudes to BVRI using either the transforms from Jester et al or Ivezic et al.

Parameters:

mag_dataastropy.table.Table

Table containing g, r and i magnitudes (or at least) those required to transform to the desired output filter.

output_filter‘B’, ‘V’, ‘R’ or ‘I’

Filter for which magnitude should be calculated. Note that case matters here.

g, r, istr

Name of column in table for that magnitude.

transform‘jester’ or ‘ivezic’

Transform equations to use.

Returns:

astropy.table.Column

Output transformed magnitudes as a table column

Notes

The transforms implemented in this function are taken from:

Jester, et al, The Sloan Digital Sky Survey View of the Palomar-Green Bright Quasar Survey, AJ 130, p. 873 (2005) http://iopscience.iop.org/article/10.1086/432466/meta

Ivezić et al, A Comparison of SDSS Standard Star Catalog for Stripe 82 with Stetson’s Photometric Standards, The Future Of Photometric, Spectrophotometric And Polarimetric Standardization, ASP Conference Series 364, p. 165 (2007) http://aspbooks.org/custom/publications/paper/364-0165.html