from .baseMetric import BaseMetric
from scipy.interpolate import interp1d
__all__ = ['StarDensityMetric']
[docs]class StarDensityMetric(BaseMetric):
"""Interpolate the stellar luminosity function to return the number of
stars per square arcsecond brighter than the rmagLimit. Note that the
map is built from CatSim stars in the range 20 < r < 28."""
def __init__(self, rmagLimit=25., units='stars/sq arcsec', maps=['StellarDensityMap'], **kwargs):
super(StarDensityMetric, self).__init__(col=[],
maps=maps, units=units, **kwargs)
self.rmagLimit = rmagLimit
[docs] def run(self, dataSlice, slicePoint=None):
# Interpolate the data to the requested mag
interp = interp1d(slicePoint['starMapBins'][1:], slicePoint['starLumFunc'])
# convert from stars/sq degree to stars/sq arcsec
result = interp(self.rmagLimit)/(3600.**2)
return result