Nuisance#

class cosmicjellyfish.cosmology.nuisance.Nuisance(configuration=None, spectrobiasparams=None, spectrononlinearpars=None, IMbiasparams=None)[source]#

Bases: object

gcph_bias(biaspars, ibin=1)[source]#

Galaxy bias

Parameters:: z (array) – redshift
Returns:: Value galaxy bias at redshift z
Return type:: float

IA(IApars, cosmo)[source]#

Intrinsic Alignment

Parameters:

z – float redshift

Returns:

float: Value of IA window at redshift z

Notes:

Implements the following equation:

\[W_i^{IA} = -\frac{\mathcal{A}_{\rm IA}C_{\rm IA}\Omega_m\mathcal{F}_{\rm IA}}{D(z)} \frac{n_i(z)}{\bar{n}}\frac{H(z)}{c}\]

luminosity_ratio()[source]#

Luminosity ratio function used for Intrinsic Alignment eNLA model.

This function reads and interpolates the luminosity ratio <L(z)>/L*(z) from a file. The ratio is used in the extended nonlinear alignment (eNLA) model for intrinsic alignments.

Parameters:: None
Returns:: An interpolation function that takes redshift z as input and returns the luminosity ratio. If the luminosity ratio file cannot be loaded, returns a function that always returns 1.0.
Return type:: callable

Notes

Attempts to read the luminosity ratio from ‘lumratio_file.dat’ in the specs directory
The file should contain two columns: redshift and luminosity ratio values
The luminosity ratio represents <L(z)>/L*(z), where:
- <L(z)> is the mean luminosity at redshift z
- L*(z) is the characteristic luminosity at redshift z
Uses linear interpolation between data points

gcsp_zbins()[source]#: Reads from file for a given survey

gcsp_bias_at_zi(zi)[source]#

Parameters:: zi (int) – Redshift bin index
Returns:: Bias at the redshift bin index zi
Return type:: float

gcsp_bias_at_z(z)[source]#

Parameters:: z (float) – Redshift
Returns:: Bias at the redshift z
Return type:: float

gcsp_bias_interp()[source]#

Galaxy bias for the galaxies used in spectroscopic Galaxy Clustering

Returns:

object
Interpolating function of bias for the redshift bins given

Note

Reads from file and interpolates for a given survey

gcsp_dndz()[source]#: Reads from file for a given survey

IM_zbins_func()[source]#: Reads from file for a given survey

IM_bias_fitting(z)[source]#: IM 21cm HI bias function from https://arxiv.org/abs/2006.05996

IM_THI_noise()[source]#

Create interpolation function for HI intensity mapping system noise temperature.

Creates a spline interpolation of the system noise temperature (T_sys) as a function of redshift for HI intensity mapping observations. The noise temperature data is read from the survey specifications.

Returns:: Interpolation function that takes redshift as input and returns the corresponding system noise temperature in Kelvin.
Return type:: UnivariateSpline

Notes

The survey specifications must contain a ‘THI_sys_noise’ dictionary with:

‘z_vals_THI’array-like
Redshift values where noise temperature is defined
‘THI_sys_noise’array-like
System noise temperature values in Kelvin corresponding to each redshift