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01-SelectTargets

Input data

path name type unit description
/gal/magnitude_u float array none magnitude in U filter
/gal/magnitude_g float array none magnitude in G filter
/gal/magnitude_r float array none magnitude in R filter
/gal/magnitude_i float array none magnitude in I filter
/gal/magnitude_z float array none magnitude in Z filter
/gal/magnitude_y float array none magnitude in Y filter
/gal/magnitude_h float array none magnitude in H filter
/gal/redshift_photometric float array none redshift z as estimated from photometry (magnitudes)

Parameters

(in param_target_selection.ini)

name type description
mag_{u,g,r,i,z,y,h}_{min,max} float upper and lower bounds for the magnitudes. Note that unknown magnitudes are often labelled 99 or -99 in catalogs, so bounds between 99 and -99 are appropriate and will discard these artificially bad values
photo_z_{min,max} float upper and lower bound on the redshift (as estimated from the magnitudes)
{elg,lrg}_linear_cuts_coeffs list each element is a list of 9 floats, describing the linear cut list [0] + list [1]*mag_u + list [2]*mag_g + list [3]*mag_r + list [4]*mag_i + list [5]*mag_z + list [6]*mag_z + list [7]*mag_z + list [8]*photo_z < 0

Any additional parameters encountered in the parameter file refer to more elaborate selections based on a training catalog, which we have discarded for now. Direct any questions about this to Ben Hambrecht.

Output

path name type unit description
/gal/elg_selection_flag bool array none has the galaxy been identified as an ELG?
/gal/lrg_selection_flag bool array none has the galaxy been identified as an LRG?
/gal/target_selection_flag bool array none has the galaxy been selected as a target? (is it an ELG or an LRG?)

Algorithm