Source code for lenstronomy.SimulationAPI.ObservationConfig.Euclid
"""Provisional Euclid instrument and observational settings.
See Optics and Observation Conditions spreadsheet at
https://docs.google.com/spreadsheets/d/1pMUB_OOZWwXON2dd5oP8PekhCT5MBBZJO1HV7IMZg4Y/edit?usp=sharing for list of
sources. """
import lenstronomy.Util.util as util
__all__ = ['Euclid']
VIS_obs = {'exposure_time': 565.,
'sky_brightness': 22.35,
'magnitude_zero_point': 24.0,
'num_exposures': 4,
'seeing': 0.16,
'psf_type': 'GAUSSIAN'}
"""
:keyword exposure_time: exposure time per image (in seconds)
:keyword sky_brightness: sky brightness (in magnitude per square arcseconds in units of electrons)
:keyword magnitude_zero_point: magnitude in which 1 count (e-) per second per arcsecond square is registered
:keyword num_exposures: number of exposures that are combined (depends on coadd_years)
:keyword seeing: Full-Width-at-Half-Maximum (FWHM) of PSF
:keyword psf_type: string, type of PSF ('GAUSSIAN' supported)
"""
[docs]class Euclid(object):
"""
class contains Euclid instrument and observation configurations
"""
def __init__(self, band='VIS', psf_type='GAUSSIAN', coadd_years=6):
"""
:param band: string, only 'VIS' supported. Determines obs dictionary.
:param psf_type: string, type of PSF ('GAUSSIAN' supported).
:param coadd_years: int, number of years corresponding to num_exposures in obs dict. Currently supported: 2-6.
"""
self.obs = VIS_obs
if band != 'VIS':
raise ValueError("band %s not supported! Choose 'VIS'." % band)
if psf_type != 'GAUSSIAN':
raise ValueError("psf_type %s not supported!" % psf_type)
if coadd_years > 6 or coadd_years < 2:
raise ValueError(" %s coadd_years not supported! Choose an integer between 2 and 6." % coadd_years)
elif coadd_years != 6:
self.obs['num_exposures'] = (coadd_years * VIS_obs["num_exposures"]) // 6
self.camera = {'read_noise': 4.2,
'pixel_scale': 0.101,
'ccd_gain': 3.1,
}
"""
:keyword read_noise: std of noise generated by read-out (in units of electrons)
:keyword pixel_scale: scale (in arcseconds) of pixels
:keyword ccd_gain: electrons/ADU (analog-to-digital unit).
"""
[docs] def kwargs_single_band(self):
"""
:return: merged kwargs from camera and obs dicts
"""
kwargs = util.merge_dicts(self.camera, self.obs)
return kwargs