AssembiasLeauthaud11Cens

class halotools.empirical_models.AssembiasLeauthaud11Cens(**kwargs)

Bases: Leauthaud11Cens, HeavisideAssembias

Assembly-biased modulation of Leauthaud11Cens.

Parameters:

thresholdfloat, optional

Stellar mass threshold of the mock galaxy sample in h=1 solar mass units. Default value is specified in the model_defaults module.

Values in the Leauthaud11 parameter dictionary are quoted assuming h=0.72, so that a direct comparison can be made to the best-fitting values quoted in Leauthaud+11. However, the threshold of the sample in halotools is defined assuming h=1. This means that in order to compare your parameter dictionary to the best-fitting parameters in Leauthaud+11, you will need to compare to the appropriately scaled threshold. For example, in Figure 2 of arXiv:1103.2077, the most massive sample is labeled logsm>11.4. In Halotools, this corresponds to threshold=11.115.

prim_haloprop_keystring, optional

String giving the column name of the primary halo property governing the occupation statistics of gal_type galaxies. Default value is specified in the model_defaults module.

sec_haloprop_keystring, optional

String giving the column name of the secondary halo property governing the assembly bias. Must be a key in the table passed to the methods of HeavisideAssembiasComponent. Default value is specified in the model_defaults module.

redshiftfloat, optional

Redshift of the stellar-to-halo-mass relation. Default is set in the sim_defaults module.

splitfloat or list, optional

Fraction or list of fractions between 0 and 1 defining how we split halos into two groupings based on their conditional secondary percentiles. Default is 0.5 for a constant 50/50 split.

split_abscissalist, optional

Values of the primary halo property at which the halos are split as described above in the split argument. If loginterp is set to True (the default behavior), the interpolation will be done in the logarithm of the primary halo property. Default is to assume a constant 50/50 split.

assembias_strengthfloat or list, optional

Fraction or sequence of fractions between -1 and 1 defining the assembly bias correlation strength. Default is 0.5.

assembias_strength_abscissalist, optional

Values of the primary halo property at which the assembly bias strength is specified. Default is to assume a constant strength of 0.5. If passing a list, the strength will interpreted at the input assembias_strength_abscissa. Default is to assume a constant strength of 0.5.