Source code for lenstronomy.SimulationAPI.ObservationConfig.LSST

"""Provisional LSST 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__ = ['LSST']

u_band_obs = {'exposure_time': 15.,
              'sky_brightness': 22.99,
              'magnitude_zero_point': 26.5,
              'num_exposures': 140,
              'seeing': 0.81,
              'psf_type': 'GAUSSIAN'}

g_band_obs = {'exposure_time': 15.,
              'sky_brightness': 22.26,
              'magnitude_zero_point': 28.30,
              'num_exposures': 200,
              'seeing': 0.77,
              'psf_type': 'GAUSSIAN'}

r_band_obs = {'exposure_time': 15.,
              'sky_brightness': 21.2,
              'magnitude_zero_point': 28.13,
              'num_exposures': 460,
              'seeing': 0.73,
              'psf_type': 'GAUSSIAN'}

i_band_obs = {'exposure_time': 15.,
              'sky_brightness': 20.48,
              'magnitude_zero_point': 27.79,
              'num_exposures': 460,
              'seeing': 0.71,
              'psf_type': 'GAUSSIAN'}

z_band_obs = {'exposure_time': 15.,
              'sky_brightness': 19.6,
              'magnitude_zero_point': 27.40,
              'num_exposures': 400,
              'seeing': 0.69,
              'psf_type': 'GAUSSIAN'}

y_band_obs = {'exposure_time': 15.,
              'sky_brightness': 18.61,
              'magnitude_zero_point': 26.58,
              'num_exposures': 400,
              'seeing': 0.68,
              '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)
    when coadd_years = 10: num_exposures is baseline num of visits over 10 years (x2 since 2x15s exposures per visit)
:keyword seeing: Full-Width-at-Half-Maximum (FWHM) of PSF
:keyword psf_type: string, type of PSF ('GAUSSIAN' supported)
"""


[docs]class LSST(object): """ class contains LSST instrument and observation configurations """ def __init__(self, band='g', psf_type='GAUSSIAN', coadd_years=10): """ :param band: string, 'u', 'g', 'r', 'i', 'z' or 'y' 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: 1-10. """ if band.isalpha(): band = band.lower() if band == 'g': self.obs = g_band_obs elif band == 'r': self.obs = r_band_obs elif band == 'i': self.obs = i_band_obs elif band == 'u': self.obs = u_band_obs elif band == 'z': self.obs = z_band_obs elif band == 'y': self.obs = y_band_obs else: raise ValueError("band %s not supported! Choose 'u', 'g', 'r', 'i', 'z' or 'y'." % band) if psf_type != 'GAUSSIAN': raise ValueError("psf_type %s not supported!" % psf_type) if coadd_years > 10 or coadd_years < 1: raise ValueError(" %s coadd_years not supported! Choose an integer between 1 and 10." % coadd_years) elif coadd_years != 10: self.obs['num_exposures'] = coadd_years*self.obs['num_exposures']//10 self.camera = {'read_noise': 10, # will be <10 'pixel_scale': 0.2, 'ccd_gain': 2.3, } """ :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