Module units

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Units class hierarchy: is used to manage both wavelength and flux unit conversions

Warning: vegamag unit conversions require spectrum and locations => circular imports.

Classes

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BaseUnit
Base class for all units; defines UI

WaveUnits
All WaveUnits know how to convert themselves to Angstroms

FluxUnits
All FluxUnits know how to convert themselves to Photlam

LogFluxUnits
Base class for magnitudes, which often require special handling

Angstrom

Photlam
photlam = photons cm^-2 s^-1 Ang^-1)

InverseMicron

_MetricWavelength
Encapsulates some easy unit-conversion machinery.

Micron

Meter

Flam
flam = erg cm^-2 s^-1 Ang^-1

Photnu
photnu = photon cm^-2 s^-1 Hz^-1

Fnu
fnu = erg cm^-2 s^-1 Hz^-1

Jy
jy = 10^-23 erg cm^-2 s^-1 Hz^-1

mJy
mjy = 10^-26 erg cm^-2 s^-1 Hz^-1

ABMag

STMag

OBMag

VegaMag

Counts

Functions

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Units(uname)
This needs to be a factory function in order to return an object of the correct subclass.

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ismatch(a, b)
Method to allow smart comparisons between classes, instances, and string representations of units and give the right answer.

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factory(uname, *args, **kwargs)

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_getDeltaWave(wave)
Compute delta wavelngth for an array of wavelengths.

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Variables

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C = 2.99792458e+18

H = 6.6262e-27

HC = 1.9864847852e-08

ABZERO = -48.6

STZERO = -21.1

HSTAREA = 45238.93416

Function Details

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_getDeltaWave(wave)

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Compute delta wavelngth for an array of wavelengths. If we had a WaveTable class, this function would be a method on that class: possible refactoring candidate.