def misc():
# get_vega() downloads this one
synphot.specio.read_remote_spec(
'http://ssb.stsci.edu/cdbs/calspec/alpha_lyr_stis_008.fits')
# G5V of UVKLIB subset of Pickles library
# see http://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/pickles-atlas.html
synphot.specio.read_remote_spec(
'http://ssb.stsci.edu/cdbs/grid/pickles/dat_uvk/pickles_uk_27.fits')
# read the sourcespectrum
spG5V = SourceSpectrum.from_file(
'http://ssb.stsci.edu/cdbs/grid/pickles/dat_uvk/pickles_uk_27.fits')
spG2V = SourceSpectrum.from_file(
'http://ssb.stsci.edu/cdbs/grid/pickles/dat_uvk/pickles_uk_26.fits')
filtR = SpectralElement.from_filter('johnson_r')
spG2V_19r = spG2V.normalize(19 * synphot.units.VEGAMAG,
filtR,
vegaspec=SourceSpectrum.from_vega())
bp = SpectralElement(Box1D, x_0=700 * u.nm, width=600 * u.nm)
obs = Observation(spG2V_19r, bp)
obs.countrate(area=50 * u.m**2)
bp220 = SpectralElement(Box1D, x_0=800 * u.nm, width=400 * u.nm)
bpCRed = SpectralElement(Box1D, x_0=1650 * u.nm, width=300 * u.nm) * 0.8
Observation(spG2V_19r, bp220).countrate(area=50 * u.m**2)
Observation(spG2V_19r, bpCRed).countrate(area=50 * u.m**2)
spM0V_8R = get_normalized_star_spectrum('M0V', 8.0, 'johnson_r')
uPhotonSecM2Micron = u.photon / (u.s * u.m**2 * u.micron)
spG2V_8R = get_normalized_star_spectrum("G2V", 8.0, 'johnson_r')
plt.plot(spG2V_8R.waveset,
spG2V_8R(spG2V_8R.waveset).to(uPhotonSecM2Micron))
# compare with Armando's
spG2V_19R = get_normalized_star_spectrum("G2V", 19, 'johnson_r')
bp = SpectralElement(Box1D, x_0=700 * u.nm, width=600 * u.nm)
obs = Observation(spG2V_19R, bp)
obs.countrate(area=50 * u.m**2)
# zeropoint in filtro r in erg/s/cm2/A
Observation(get_normalized_star_spectrum('A0V', 0, 'johnson_r'),
SpectralElement.from_filter('johnson_r')).effstim('flam')
# zeropoint in ph/s/m2
Observation(get_normalized_star_spectrum('A0V', 0, 'johnson_r'),
SpectralElement.from_filter('johnson_r')).countrate(area=1 *
u.m**2)
def test_remote_band_v():
sp1 = spparser.parse_spec('band(v)')
_single_functioncall(
sp1, spectrum.ObservationSpectralElement, Empirical1D, 'band(v)',
ans_z=None)
sp2 = SpectralElement.from_filter('johnson_v')
_compare_spectra(sp1, sp2)
def test_remote_rn_powerlaw():
sp1 = spparser.parse_spec('rn(pl(5000, 1, flam), band(v), 1, photlam)')
_single_functioncall(sp1, SourceSpectrum, None,
'rn(pl(5000.0,1.0,flam),band(v),1.0,photlam)')
pl = SourceSpectrum(PowerLawFlux1D, amplitude=1 * units.FLAM,
x_0=5000 * u.AA, alpha=-1)
bp = SpectralElement.from_filter('johnson_v')
sp2 = pl.normalize(1 * units.PHOTLAM, band=bp)
_compare_spectra(sp1, sp2)
def get(cls, filter_name):
'''
Return synphot.SpectralElement of the specified filter
The list of available filter is accessible via Filters.names()
'''
if filter_name in cls.SYNPHOT:
return SpectralElement.from_filter(filter_name)
else:
method_to_call = getattr(cls, '_%s' % filter_name)
return method_to_call()
def test_std_filter(self):
obs1 = spectrum.band('johnson,v')
obs2 = SpectralElement.from_filter('johnson_v', encoding='binary')
w = obs1.waveset
np.testing.assert_allclose(obs1(w), obs2(w))
# No pixel scale
with pytest.raises(synexceptions.SynphotError):
obs1.thermback()
# No binset
with pytest.raises(synexceptions.UndefinedBinset):
obs1.binned_waverange(5000, 2)
with pytest.raises(synexceptions.UndefinedBinset):
obs1.binned_pixelrange([5000, 5002])
def test_remote_rn_calspec_u():
sp1 = spparser.parse_spec(
'rn(crcalspec$bd_75d325_stis_002.fits, band(u), 9.5, vegamag) * '
'band(fos, blue, 4.3, g160l)')
# NOTE: No expr for this combo.
_single_functioncall(sp1, SourceSpectrum, None, '')
bd75 = SourceSpectrum.from_file(resolve_filename(
os.environ['PYSYN_CDBS'], 'calspec', 'bd_75d325_stis_002.fits'))
bp_u = SpectralElement.from_filter('johnson_u')
bd75_norm = bd75.normalize(
9.5 * units.VEGAMAG, band=bp_u, vegaspec=spectrum.Vega)
bp_fos = spectrum.band('fos, blue, 4.3, g160l')
sp2 = bd75_norm * bp_fos
_compare_spectra(sp1, sp2)
def test_std_filter(self):
obs1 = spectrum.band('johnson,v')
obs2 = SpectralElement.from_filter('johnson_v', encoding='binary')
w = obs1.waveset
np.testing.assert_allclose(obs1(w), obs2(w))
# No pixel scale
with pytest.raises(synexceptions.SynphotError):
obs1.thermback()
# No binset
with pytest.raises(synexceptions.UndefinedBinset):
obs1.binned_waverange(5000, 2)
with pytest.raises(synexceptions.UndefinedBinset):
obs1.binned_pixelrange([5000, 5002])