angular_diameter_distance

Protocols

StandardCosmology.angular_diameter_distance()

DistanceMeasures.angular_diameter_distance()

HasAngularDiameterDistance.angular_diameter_distance()

Reference

cosmo.angular_diameter_distance(z: InputT, /) → Array

cosmo.angular_diameter_distance(z1: InputT, z2: InputT, /) → Array

Angular diameter distance \(d_A\) in Mpc.

This gives the proper (sometimes called ‘physical’) transverse distance corresponding to an angle of 1 radian for an object at redshift z ([1], [2], [3]).

Parameters:

zArray, positional-only

z1, z2Array, positional-only

Input redshifts. If one argument z is given, the distance \(d_A(0, z)\) is returned. If two arguments z1, z2 are given, the distance \(d_A(z_1, z_2)\) is returned.

Returns:

Array

The angular diameter distance \(d_A\) in Mpc.

References

[1]

Weinberg, 1972, pp 420-424; Weedman, 1986, pp 421-424.

[2]

Weedman, D. (1986). Quasar astronomy, pp 65-67.

[3]

Peebles, P. (1993). Principles of Physical Cosmology, pp 325-327.