SVO Filter Profile Service Queries (astroquery.svo_fps)¶
Getting started¶
This is a python interface for querying the Spanish Virtual Observatory’s Filter Profile Service (SVO FPS). It allows retrieval of filter data (index, transmission data, filter list, etc.) from the service as astropy tables.
Get index list of all Filters¶
The filter index (all available filters with their properties) can be listed
with get_filter_index:
>>> from astroquery.svo_fps import SvoFps
>>> index = SvoFps.get_filter_index()
>>> index.info
<Table masked=True length=5139>
name dtype unit
-------------------- ------- ----
FilterProfileService object
filterID object
WavelengthUnit object
WavelengthUCD object
PhotSystem object
DetectorType object
Band object
Instrument object
Facility object
ProfileReference object
CalibrationReference object
Description object
Comments object
WavelengthMean float32 AA
WavelengthEff float32 AA
WavelengthMin float32 AA
WavelengthMax float32 AA
WidthEff float32 AA
WavelengthCen float32 AA
WavelengthPivot float32 AA
WavelengthPeak float32 AA
WavelengthPhot float32 AA
FWHM float32 AA
PhotCalID object
MagSys object
ZeroPoint float32 Jy
ZeroPointUnit object
Mag0 float32
ZeroPointType object
AsinhSoft float32
TrasmissionCurve object
There are options to downselect based on the minimum
and maximum effective wavelength (wavelength_eff_min
and wavelength_eff_max, respectively).
Get list of Filters under a specified Facilty and Instrument¶
Similarly, get_filter_list retrieves a list of all
Filters for an arbitrary combination of Facility & Instrument (the Facility
must be specified, but the Instrument is optional). The data table returned
is of the same form as that from get_filter_index:
>>> filter_list = SvoFps.get_filter_list(facility='Keck', instrument='NIRC2')
>>> filter_list.info
<Table masked=True length=11>
name dtype unit
-------------------- ------- ----
FilterProfileService object
filterID object
WavelengthUnit object
WavelengthUCD object
PhotSystem object
DetectorType object
Band object
Instrument object
Facility object
ProfileReference object
CalibrationReference object
Description object
Comments object
WavelengthMean float32 AA
WavelengthEff float32 AA
WavelengthMin float32 AA
WavelengthMax float32 AA
WidthEff float32 AA
WavelengthCen float32 AA
WavelengthPivot float32 AA
WavelengthPeak float32 AA
WavelengthPhot float32 AA
FWHM float32 AA
PhotCalID object
MagSys object
ZeroPoint float32 Jy
ZeroPointUnit object
Mag0 float32
ZeroPointType object
AsinhSoft float32
TrasmissionCurve object
Get transmission data for a specific Filter¶
If you know the filterID of the filter (which you can determine with
get_filter_list or
get_filter_index), you can retrieve the
transmission curve data using
get_transmission_data:
>>> data = SvoFps.get_transmission_data('2MASS/2MASS.H')
>>> print(data)
Wavelength Transmission
AA
---------- ------------
12890.0 0.0
13150.0 0.0
13410.0 0.0
13680.0 0.0
13970.0 0.0
14180.0 0.0
14400.0 0.0005
14620.0 0.0028
14780.0 0.0081
14860.0 0.0287
... ...
18030.0 0.1077
18100.0 0.0707
18130.0 0.0051
18180.0 0.02
18280.0 0.0004
18350.0 0.0
18500.0 1e-04
18710.0 0.0
18930.0 0.0
19140.0 0.0
Length = 58 rows
These are the data needed to plot the transmission curve for filter:
>>> import matplotlib.pyplot as plt
>>> plt.plot(data['Wavelength'], data['Transmission'])
>>> plt.xlabel('Wavelength (Angstroms)')
>>> plt.ylabel('Transmission Fraction')
>>> plt.title('Filter Curve for 2MASS/2MASS.H')
>>> plt.show()
The 2MASS H-band transmission curve¶
Reference/API¶
astroquery.svo_fps Package¶
SVO FPS query tool¶
Access to the Spanish Virtual Observatory (SVO) Filter Profile Service (FPS).
Classes¶
Class for querying the Spanish Virtual Observatory filter profile service |
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Configuration parameters for |