Specifying filters¶
Included filters¶
The blendz
installation includes filter response curves from several instruments. The filter_path
configuration option points to the folder where these are stored by default, and so they can be
specified in the filters
configuration option using the following names:
SDSS
Described in Stoughton et al. (2002)
Configuration option | Description |
---|---|
sdss/u |
u |
sdss/g |
g |
sdss/r |
r |
sdss/i |
i |
sdss/z |
z |
Viking
Described in Edge et al. (2013)
Configuration option | Description |
---|---|
viking/h |
H |
viking/j |
J |
viking/k |
K |
viking/y |
Y |
LSST
Described in Abell et al.(2009)
Configuration option | Description |
---|---|
lsst/u |
u |
lsst/g |
g |
lsst/r |
r |
lsst/i |
i |
lsst/z |
z |
lsst/y |
Y |
HST
As packaged in BPZ (Benitez (2000) )
Configuration option | Description |
---|---|
hst/F110W |
F110W |
hst/F160W |
F160W |
hst/F435W |
F435W |
hst/F606W |
F606W |
hst/F775W |
F775W |
hst/F850LP |
F850LP |
Loading custom filters¶
Each custom filter can be specified by a single plaintext file of two columns, wavelength (Angstroms) in the first, and the filter response in the second, separated by whitespace, e.g.
912.0 0.0329579004203
920.0 0.0332336431181
930.0 0.0335731230922
940.0 0.033939398051
950.0 0.0342922864396
960.0 0.0346317644112
970.0 0.0349582358084
980.0 0.0352716948728
990.0 0.0355717998991
1000.0 0.0358573156287
1010.0 0.0361306346606
The filter_path
configuration option should point to the folder where
these files are stored, and each entry in the filters
configuration option
should be the path (including the name and file extension) relative to filter_path
, i.e.,
for the following folder layout:
containing_folder/
├── filters/
│ ├── instrument_one/
│ │ ├── filter_one.txt
│ │ ├── filter_two.txt
│ ├── instrument_two/
│ │ ├── filter_three.txt
│ │ ├── filter_four.txt
you should set the configuration options to:
filter_path = "containing_folder/filters"
filters = ["instrument_one/filter_one.txt", "instrument_one/filter_two.txt", \
"instrument_two/filter_three.txt", "instrument_two/filter_four.txt"]
The default filters only don’t need file extensions as they are saved in plaintext files without file extensions.