angular_size¶
- skypy.galaxies.morphology.angular_size(physical_size, redshift, cosmology)[source] [edit on github]¶
Angular size of a galaxy. This function transforms physical radius into angular distance, described in [1].
- Parameters:
- physical_sizeastropy.Quantity
Physical radius of galaxies in units of length.
- redshiftfloat
Redshifts at which to evaluate the angular diameter distance.
- cosmologyastropy.cosmology.Cosmology
Cosmology object providing methods for the evolution history of omega_matter and omega_lambda with redshift.
- Returns:
- angular_sizeastropy.Quantity
Angular distances in units of [rad] for a given radius.
References
[1]Hogg, (1999), astro-ph/9905116.