How to use the pysynphot.FlatSpectrum function in pysynphot

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github gbrammer / grizli / grizli / utils.py View on Github external
bandpasses : list
        List of `pysynphot` bandpass objects, e.g., 
        
           >>> import pysynphot as S
           >>> bandpasses = [S.ObsBandpass('wfc3,ir,f140w')]
    
    
    Returns
    -------
    ab_mags : dict
        Dictionary with keys from `bandpasses` and the integrated magnitudes
        
    """
    import pysynphot as S
    flat = S.FlatSpectrum(0, fluxunits='ABMag')
    ab_mags = OrderedDict()
    
    for bp in bandpasses:
        flat_obs = S.Observation(flat, bp)
        spec_obs = S.Observation(spectrum, bp)
        ab_mags[bp.name] = -2.5*np.log10(spec_obs.countrate()/flat_obs.countrate())
    
    return ab_mags
github gbrammer / grizli / grizli / model.py View on Github external
'F140W': 13922.907350356367, 
            'F160W': 15369.175708965562,
            'F435W': 4328.256914042873, 
            'F606W': 5921.658489236346,
            'F775W': 7693.297933335407,
            'F814W': 8058.784799323767,
            'VISTAH':1.6433e+04,
            'GRISM': 1.6e4}

no_newline = '\x1b[1A\x1b[1M' # character to skip clearing line on STDOUT printing

### Demo for computing photflam and photplam with pysynphot
if False:
    import pysynphot as S
    n = 1.e-20
    spec = S.FlatSpectrum(n, fluxunits='flam')
    photflam = {}
    photplam = {}
    for filter in ['F098M', 'F105W', 'F110W', 'F125W', 'F140W', 'F160W']:
        bp = S.ObsBandpass('wfc3,ir,%s' %(filter.lower()))
        photplam[filter] = bp.pivot()
        obs = S.Observation(spec, bp)
        photflam[filter] = n/obs.countrate()
        
    for filter in ['F435W', 'F606W', 'F775W', 'F814W']:
        bp = S.ObsBandpass('acs,wfc1,%s' %(filter.lower()))
        photplam[filter] = bp.pivot()
        obs = S.Observation(spec, bp)
        photflam[filter] = n/obs.countrate()
        
    
class GrismFLT(object):

pysynphot

Python Synthetic Photometry Utilities

BSD-3-Clause
Latest version published 3 years ago

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