21 """Configuration for SED terms in fgcmcal. 22 Analogous to colorterms. 25 from lsst.pex.config
import Config, Field, ConfigDictField
27 __all__ = [
"Sedterm",
"SedtermDict",
"Sedboundaryterm",
"SedboundarytermDict"]
31 """SED boundary term for a pair of bands. 33 The SED slope (in flux units) at the boundary between two bands is given by: 35 S = -0.921 * (primary - secondary) / (lambda_primary - lambda_secondary) 37 To construct a Sedboundaryterm, use keyword arguments: 38 Sedboundaryterm(primary=primaryBandName, secondary=secondaryBandName) 40 This is a subclass of Config. This follows the form of 41 `lsst.pipe.tasks.Colorterm`. 43 primary = Field(dtype=str, doc=
"name of primary band")
44 secondary = Field(dtype=str, doc=
"name of secondary band")
48 """A mapping of Sedboundaryterm name to Sedterm. 50 To construct a SedboundarytermDict use keyword arguments: 51 SedboundarytermDict(data=dataDict) 52 where dataDict is a Python dict of name: Sedterm 55 SedboundarytermDict(data={ 56 'gr': Sedboundaryterm(primary="g", secondary="r"), 60 This
is a subclass of Config. This follows the form of
61 `lsst.pipe.tasks.ColortermDict`.
63 data = ConfigDictField( 64 doc="Mapping of Sedboundary term name to Sedboundaryterm", 66 itemtype=Sedboundaryterm, 71 class Sedterm(Config): 72 """SED term
for a single band.
74 The SED slope (
in flux units)
in the middle of a band
is computed either
75 as an
"interpolated" or "extrapolated" computation. See Burke et al. 2018
76 Appendix A (https://ui.adsabs.harvard.edu/abs/2018AJ....155...41B).
78 For interpolation, with a secondary term::
80 F
'_nu ~ constant * (primaryTerm + secondaryTerm) / 2.0 82 For interpolation, without a secondary term:: 84 F'_nu ~ constant * primaryTerm 88 F'_nu ~ primaryTerm + constant * (((lambda_primaryBand - lambda_secondaryBand) / 89 (lambda_primaryBand - lambda_tertiaryBand)) * 90 (primaryTerm - secondaryTerm)) 92 where primaryTerm and secondaryTerm are names
from a `SedboundarytermDict`,
and 93 primaryBand, secondaryBand,
and tertiaryBand are band names.
95 To construct a Sedterm, use keyword arguments::
97 Sedterm(primaryTerm=primaryTermName, secondaryTerm=secondaryTermName,
98 extrapolated=
False, constant=1.0)
102 Sedterm(primaryTerm=primaryTermName, secondaryTerm=secondaryTermName,
103 extrapolated=
True, constant=1.0, primaryBand=primaryBandName,
104 secondaryBand=secondaryBandName, tertiaryBand=tertiaryBandName)
106 This
is a subclass of Config. This follows the form of
107 `lsst.pipe.tasks.Colorterm`.
109 primaryTerm = Field(dtype=str, doc="Name of primary Sedboundaryterm") 110 secondaryTerm = Field(dtype=str, default=None, optional=True, 111 doc="Name of secondary Sedboundaryterm") 112 extrapolated = Field(dtype=bool, default=False, doc="Extrapolate to compute SED slope") 113 constant = Field(dtype=float, default=1.0, doc="Adjustment constant for SED slope") 114 primaryBand = Field(dtype=str, default=None, optional=True, 115 doc="Primary band name for extrapolation") 116 secondaryBand = Field(dtype=str, default=None, optional=True, 117 doc="Secondary band name for extrapolation") 118 tertiaryBand = Field(dtype=str, default=None, optional=True, 119 doc="Tertiary band name for extrapolation") 122 Config.validate(self) 123 if self.extrapolated: 124 if self.primaryBand is None or \ 125 self.secondaryBand is None or \ 126 self.tertiaryBand is None: 127 raise RuntimeError("extrapolated requires primaryBand, secondaryBand, and " 128 "tertiaryBand are provided.") 131 class SedtermDict(Config): 132 """A mapping of bands to Sedterms.
134 To construct a SedtermDict use keyword arguments::
138 where dataDict
is a Python dict of band to Sedterm
142 'g':
Sedterm(primaryTerm=
'gr', secondaryTerm=
'ri', extrapolated=
True, constant=0.25,
143 primaryBand=
'g', secondaryBand=
'r', tertiaryBand='i'),
144 'r': Sedterm(primaryTerm='gr', secondaryTerm='ri', extrapolated=False)
147 This
is a subclass of Config. This follows the form of
148 `lsst.pipe.tasks.ColortermDict`.
150 data = ConfigDictField( 151 doc="Mapping of band name to Sedterm",