skymodel.skymodel

skymodel.skymodel(freq, sensitivity=None, components='all', red_noise=False, cl_file=None, lensed=True, out_file=None, nside_out=4096, lmax=None, beam_FWHM=None, template='WebSky', unit='cmb')

Computes an all-sky map of the simulated microwave sky at the specified frequency. The skymodel uses all-sky templates in the healpix format and includes the most important galactic foregrounds, extragalactic backgrounds, the tSZ and kSZ effects of galaxy clusters, and instrumental white/red noise. The individual components can be selectively switched on and of.

Parameters

freq: float or float array

Frequency of the output map in Hz. If freq =-1 mean that we get frequency independent maps.

sensitivity: float, optional

sensitivity of the instrument in units of micro K_CMB - arcmin. Default: None

components: string or list of stings, optional

List containing the names of the components to be included in the sky model. Any combination of the following individual components is possible: ‘gal_synchrotron’, ‘gal_dust’, ‘gal_freefree’, ‘gal_ame’, ‘cib’, ‘radio_ps’, ‘cmb’, ‘tsz’, ‘ksz’. All components are used if components is set to ‘all’. If not, the specified components have to be named within brackets, as [‘ksz’,’tsz’]. Default: ‘all’

red_noise: bool, optional

If True, a realistic white noise + red noise atmospheric model is added to the sky model in case the imput frequency is a valid SO or CCAT-prime central band frequency, i.e. 27, 39, 93, 145, 225, 279, 220, 280, 350, 405, or 860 GHz. Default: False

cl_file: string, optional

name of a file containing a CMB power spectrum computed e.g. with CAMP. The first column of the file has to correspond to ell, the second column to Cl ell(ell+1)/2pi. If set, a random realization of the CMB based on the provided powerspectrum will be added to the data. Default: None

lensed: bool, optional

If True, lensed SO, Sehgal and WebSky CMB maps will be used. Default: True

out_file: string, optional

If set, the results will be written as a healpy .fits file of the given name. Default: None

nside_out: float, optional

Healpix nside parameter of the output map. Must be a valid value for nside. Default: 4096

lmax: float, optional

Maximum value of the multipolemoment. Default: 3*nside_out-1

beam_FWHM: bool, optional

If set, the output will be convolved with a gaussian. The FWHM of the Gaussian in units of arcmin is given by the provided value. Default: None

template: bool, optional

Determines the all-sky foregrounds templates to be used to build the sky model. If ‘Sehgal’ is chosen, simulations by Sehgal et al. (2010) are used. If ‘SO’ is chosen, the Simons Observatory sky model provided by Colin Hill and based on the simulations by Sehgal et al. (2010) is used. If ‘WebSky’ is chosen, the used templates will be based on the WebSky Extragalactic CMB Mocks provided by CITA. If ‘SO_reproduced’ is chosen, the SO sky model is reproduced directly from the Sehgal et al. (2010) data. Default: ‘WebSky’

unit: bool, optional

Determines the units of the output map. The available units are ‘mjy’ –> MJy/sr (specific intensity), ‘cmb’ –> K_CMB (thermodynamic temperature), and ‘rj’ –> K_RJ (brightness temperature). Default: ‘cmb’.

Returns

allsky_map: float array

Healpix all-sky map of the microwave sky at the specified frequency and nside.