Package pylal :: Module cosmography

Module cosmography

Cosmography based on Hogg 1998 (astro-ph/9905116) Cosmological parameters taken from WMAP 7 year BAO + H0 ML value (arXiv:1001.4538)

Functions

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Einv(z)
Integrand used in many cosmography integrals.

source code

DM(z)
Comoving distance (transverse) at z.

source code

DL(z)
Luminosity distance

source code

compute_redshift(DL0)
Compute the redshift from a luminosity distance.

source code

dVdz(z)
Different volume element per unit redshift.

source code

V(z)
Analytical integration of dVdz.

source code

V_from_DL_z(D, z=None)
Analytical integration of dVdz.

source code

Variables

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h0 = 0.703

H0_SI = h0* 100000/(1000000* LAL_PC_SI)

DH_SI = LAL_C_SI/ H0_SI

OmegaL = 0.729

OmegaM = 0.271

OmegaR = 0

Function Details

[hide private]

Einv(z)

source code

Integrand used in many cosmography integrals. 1 / E(z) in Hogg's notation.

DM(z)

source code

Comoving distance (transverse) at z. Hard-coded for OmegaR = 0.

compute_redshift(DL0)

source code

Compute the redshift from a luminosity distance. Use the Newton-Raphson refinement method on a first-order guess.

dVdz(z)

source code

Different volume element per unit redshift. Hard-coded for OmegaR = 0.

V(z)	source code

Analytical integration of dVdz. Hard-coded for OmegaR = 0. Double precision craps out below about 100 kpc (z=2.3e-6).

V_from_DL_z(D, z=None)

source code

Analytical integration of dVdz. Hard-coded for OmegaR = 0. Sped up for the case that you have D rather than (or in addition to) z. Double precision craps out below about 100 kpc (z=2.3e-6).