Filters#
Most of the filters available to speXtra are downloaded from
the SVO database <http://svo2.cab.inta-csic.es/theory/fps/>. However, many other
system are not included in that database so a few (at the moment) are included in the database.
To list the filter systems included in the database
from spextra import spextra_database
spextra_database["filter_systems"]
{'elt/micado': 'MICADO filters',
'elt/metis': 'METIS filters',
'etc': 'ESO ETC standard filters'}
The ::class::Pasband holds the information of an astronomical filter and can be called simply using:
from spextra import Passband
filt = Passband("elt/micado/Y")
filt.plot()
Downloading file 'filter_systems/elt/micado/index.yml' from 'https://scopesim.univie.ac.at/spextra/database/filter_systems/elt/micado/index.yml' to '/home/docs/.spextra_cache'.
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Downloading file 'filter_systems/elt/micado/Y.dat' from 'https://scopesim.univie.ac.at/spextra/database/filter_systems/elt/micado/Y.dat' to '/home/docs/.spextra_cache'.
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Many standard filters have been defined using shortcuts for quicker access. Here is a list.
from spextra import DEFAULT_DATA
DEFAULT_DATA.filters
{'U': 'etc/U',
'B': 'etc/B',
'V': 'etc/V',
'R': 'etc/R',
'I': 'etc/I',
'Z': 'etc/Z',
'Y': 'etc/Y',
'J': 'etc/J',
'H': 'etc/H',
'K': 'etc/K',
'Ks': '2MASS/2MASS.Ks',
'L': 'etc/L',
'M': 'etc/M',
'N': 'etc/N',
'Q': 'etc/Q',
'u': 'SLOAN/SDSS.u',
'g': 'SLOAN/SDSS.g',
'r': 'SLOAN/SDSS.r',
'i': 'SLOAN/SDSS.i',
'z': 'SLOAN/SDSS.z',
'HAlpha': 'Gemini/GMOS-N.Ha',
'PaBeta': 'Gemini/NIRI.PaBeta-G0221',
'BrGamma': 'Gemini/NIRI.BrG-G0218',
'FUV': 'GALEX/GALEX.FUV',
'NUV': 'GALEX/GALEX.NUV',
'F435W': 'HST/ACS_WFC.F435W',
'F475W': 'HST/ACS_WFC.F475W',
'F606W': 'HST/ACS_WFC.F606W',
'F775W': 'HST/ACS_WFC.F775W',
'F814W': 'HST/ACS_WFC.F814W',
'F850LP': 'HST/ACS_WFC.F850LP',
'F105W': 'HST/WFC3_IR.F105W',
'F110W': 'HST/WFC3_IR.F110W',
'F125W': 'HST/WFC3_IR.F125W',
'F140W': 'HST/WFC3_IR.F140W',
'F160W': 'HST/WFC3_IR.F160W',
'ch1': 'Spitzer/IRAC.I1',
'ch2': 'Spitzer/IRAC.I2',
'ch3': 'Spitzer/IRAC.I3',
'ch4': 'Spitzer/IRAC.I4',
'W1': 'WISE/WISE.W1',
'W2': 'WISE/WISE.W2',
'W3': 'WISE/WISE.W3',
'W4': 'WISE/WISE.W4',
'G': 'GAIA/GAIAO.G'}
These filters can be used simply using the shortcut
from spextra import Passband
filt = Passband("g") # for sdss g-band filter
filt.plot()
Downloading data from 'http://svo2.cab.inta-csic.es/theory/fps3/fps.php?ID=SLOAN/SDSS.g' to file '/home/docs/.spextra_cache/svo_filters/SLOAN/SDSS.g'.
SHA256 hash of downloaded file: ea4dc3871f0c5dcd9ef276fcebe5e9bca6abd80cdb18abf055bba207a92fc119
Use this value as the 'known_hash' argument of 'pooch.retrieve' to ensure that the file hasn't changed if it is downloaded again in the future.
All methods in ::class::Spextrum that require to provide a filter name, can be used in either way,
using the full name or just a shortcut.
For a full list of the filters available to spextra please visit the SVO
Additionally below you can find the filter systems for prospective ELT instruments and others not available at the SVO
MICADO#
# MICADO Design - pre PDR list of filters
filter_system : micado
instrument : micado
title : MICADO Design - pre PDR list of filterswa
author : Ric Davies
source : Ric Davies
spectral_coverage :
- nir
data_type : ascii
file_extension : .dat
wave_unit : um
wave_column_name : wavelength
trans_column_name : transmission
filters: # filtername
Br-gamma : Br-gamma
FeII : FeII
H2_1-0S1 : H2_1-0S1
H-cont : H-cont
H : H
He-I : He-I
H-long : H-long
H-short : H-short
I-long : I-long
J : J
J-long : J-long
J-short : J-short
K-cont : K-cont
K-long : K-long
K-mid : K-mid
Ks2 : Ks2
Ks : Ks
K-short : K-short
Pa-beta : Pa-beta
Spec_HK : Spec_HK
Spec_IJ : Spec_IJ
xH1 : xH1
xH2 : xH2
xI1 : xI1
xI2 : xI2
xJ1 : xJ1
xJ2 : xJ2
xK1 : xK1
xK2 : xK2
xY1 : xY1
xY2 : xY2
Y : Y
METIS#
# METIS Design - pre PDR list of filters
filter_system : metis
instrument : metis
title : METIS, pre PDR list of filterswa
author : NN
source : NN
spectral_coverage :
- mir
data_type : ascii
file_extension : .dat
wave_unit : um
wave_column_name : wavelength
trans_column_name : transmission
filters : # filtername
Br_alpha : Br_alpha
Br_alpha_ref : Br_alpha_ref
CO_1-0_ice : CO_1-0_ice
CO_ref : CO_ref
H2O-ice : H2O-ice
HCI_L_long : HCI_L_long
HCI_L_short : HCI_L_short
HCI_M : HCI_M
IB_4.05 : IB_4.05
L : L
Lp : Lp
Mp : Mp
N1 : N1
N2 : N2
N3 : N3
ND_OD1 : ND_OD1
ND_OD2 : ND_OD2
ND_OD3 : ND_OD3
ND_OD4 : ND_OD4
ND_OD5 : ND_OD5
Ne_II : Ne_II
Ne_II_ref : Ne_II_ref
open : open
PAH_11.25 : PAH_11.25
PAH_11.25_ref : PAH_11.25_ref
PAH_3.3 : PAH_3.3
PAH_3.3_ref : PAH_3.3_ref
PAH_8.6 : PAH_8.6
PAH_8.6_ref : PAH_8.6_ref
Q1 : Q1
short-L : short-L
S_IV : S_IV
S_IV_ref : S_IV_ref
ETC#
Also the standard filters used by the ESO Exposure Time Calculator
# ESO ETC standard filters
filter_system : etc
instrument : etc
title : Exposure Time Calculator filter set
author : ESO
source : https://www.eso.org/observing/etc/doc/skycalc/helpskycalc.html#mags
spectral_coverage :
- vis
- nir
- mir
data_type : ascii
file_extension : .dat
wave_unit : um
wave_column_name : wavelength
trans_column_name : transmission
filters: # filtername
U : U-band
B : B-band
V : V-band
R : R-band
I : I-band
Z : Z-band
Y : Y-band
J : J-band
H : H-band
K : K-band
L : L-band
M : M-band
N : N-band
Q : Q-band