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HSC filters
NOTES:
The NB872 filter is newly opened for open-use observations from S23A.
The sensitivity values have been updated based on the modified code of HSC ETC. (June 22, 2021)
If you wish to use one of the user filters (i.e., NB, IB, and EB filters), you may need to obtain an approval in advance from the filter developer team. See 'Contact addresses of user filters'. You need to explicitly describe that you have obtained an approval in your proposal.
Narrow-band filters with their central wavelength shorter than 400 nm are not available in the queue mode because the autoguiding is apt to be failed. Currently, it applies to the NB387, NB391, and NB395 filters.
The following tables list filters available for open use observation of
the HSC, together with their sensitivites. The transmission curves
measured at the center of filters are available as plots and ASCII lists
in the respective columns.
You may need to consider
as well as transmission curves below for estimating more exact throughput of each filter.
Sensitivities listed are for a 5 sigma detection measured in a 2'' diameter aperture in 1 hour of integration, assuming good (0.5'') seeing, dark (New Moon), and clear sky (tranparency is 1.0). Please refer to the Exposure Time Calculator for sensitivities with other conditions.
Broad-band filters
Filter |
Sensitivity (AB mag) |
mag for 1 e-/s |
SNR |
Name | center | area-weighted mean |
Plot | List | Plot | List |
g |
 |
 |
 |
 |
27.6 | 28.8 |
 |
r2(1) |
 |
 |
 |
 |
27.1 | 28.9 |
 |
i2(2) |
 |
 |
 |
 |
26.4 | 28.5 |
 |
z |
 |
 |
 |
 |
25.5 | 27.5 |
 |
Y(3) |
 |
 |
 |
 |
24.8 | 27.2 |
 |
(r)(1) |
 |
 |
 |
 |
27.1 | 28.8 |
 |
(i)(2) |
 |
 |
 |
 |
26.4 | 28.5 |
 |
Notes:
(1) We replace the r-band filter to new one (HSC-r2) from Jul 28th 2016 (HST). We mainly used the previous r-band filter (HSC-r) till Jul 11th 2016 (HST). Please see "FILTER01" at the FITS header for checking which filter was used.
(2) We replace the i-band filter to new one (HSC-i2) from Feb 2016. We mainly used the previous i-band filter (HSC-i) till Jan 2016. Please see "FILTER01" at the FITS header for checking which filter was used.
(3) When you estimate a throughput of the Y band filter, you should consider the quantum efficiency of FDCCD, which is very low at >10000 Å.
User filters
Filter |
Sensitivity(1) (AB mag) |
mag for 1 e-/s |
Open(2) from |
When is it available without permission?(3) |
Name | center | area-weighted mean |
Plot | List | Plot | List |
NB387 |
 |
 |
 |
 |
25.1 | 24.4 |
S16B | S18A |
NB391 |
 |
 |
 |
 |
25.8 | 25.0 |
S21B | S23A |
NB395 |
 |
 |
 |
 |
25.6 | 25.2 |
S21B | S23A |
NB400 |
 |
 |
 |
 |
26.0 | 25.2 |
S19A | S20B |
NB430 |
 |
 |
 |
 |
25.7 | 25.0 |
S20A | S21B |
NB468 |
 |
 |
 |
 |
26.3 | 25.8 |
S16A | S17B |
NB497 |
 |
 |
 |
 |
25.7 | 25.5 |
S20B | S22A |
NB506 |
 |
 |
 |
 |
26.1 (4) | 26.2 |
S22B | S24A |
NB515 |
 |
 |
 |
 |
25.9 | 25.7 |
S15A | S16B |
NB527 |
 |
 |
 |
 |
25.9 | 25.8 |
S16A | S17B |
NB656 |
 |
 |
 |
 |
25.9 | 26.0 |
S16A | S16A |
NB718 |
 |
 |
 |
 |
25.5 (4) | 25.7 |
S16B | S18A |
NB816 |
 |
 |
 |
 |
25.2 | 25.5 |
S15B | S17A |
NB872 |
 |
 |
 |
 |
24.5 (5) | 24.9 |
S23A | S24B |
NB921 |
 |
 |
 |
 |
24.8 | 25.5 |
S15A | S16B |
NB926 |
 |
 |
 |
 |
24.5 | 25.5 |
S17A | S18B |
NB973 |
 |
 |
 |
 |
24.3 | 24.9 |
S17A | S18B |
NB1010 |
 |
 |
 |
 |
22.9 | 24.0 |
S18A | S19B |
IB945 |
 |
 |
 |
 |
24.5 | 26.2 |
S17A | S18B |
EB-gri |
 |
 |
 |
 |
27.3(4,5) | 29.9 |
S22B | S22B |
Notes:
(1) The sensitivity of a NB filter may be significantly affected by ununiformity of the transmittance curve across the field of view. Contact the filter developer team for details about the specification of a user filter.
(2) For user filters, during the first three semesters (or 3 call for proposals) after it is open to the public, people who are interested in using the filters must obtain an approval in advance from the filter developing team (cf. filter policy).
(3) If the semester is not passed, you must obtain an approval in advance from the filter developer team before you submit your proposal using these user filters. See 'Contact addresses of user filters.
You need to explicitly describe that you have obtained an approval in
your proposal.
(4) The values have been revised since the last update.
(5) The values are still TBD.
Contact addresses of user filters (1)
and Information for acknowledgement(2)
Filter |
PI |
Email |
Fund |
Fund number |
NB387 |
Dr. Kazuhiro Shimasaku |
 |
JSPS Kakenhi Scientific Research (A) |
23244022 |
NB391 |
Dr. Masami Ouchi |
 |
JSPS Kakenhi Scientific Research (A) |
15H02064 |
NB395 |
Dr. Masashi Chiba |
 |
JSPS Kakenhi Scientific Research (A) |
17H01101, 15H02064 |
NB400 |
Dr. Masami Ouchi |
 |
JSPS Kakenhi Scientific Research (A) |
15H02064 |
NB430 |
Dr. Masashi Chiba |
 |
JSPS Kakenhi Scientific Research (A) |
17H01101 |
NB468 |
Dr. Yuichi Matsuda |
 |
JSPS Kakenhi Scientific Research (B) |
25287043 |
NB497 |
Dr. Yuichi Matsuda |
 |
JSPS Kakenhi Young Scientists (A) |
17H04831 |
NB506 |
Dr. Masayuki Umemura |
 |
JSPS Kakenhi Scientific Research (A) |
19H00697 |
NB515 |
Dr. Masashi Chiba |
 |
MEXT Kakenhi Scientific Research on Priority Areas |
18072001 |
NB527 |
Dr. Ikuru Iwata |
 |
JSPS Kakenhi Scientific Research (A) |
24244018 |
NB718, NB816 |
Dr. Yoshiaki Taniguchi |
 |
Ehime University |
|
NB872 |
Dr. Nobunari Kashikawa |
 |
JSPS Kakenhi Scientific Research (A) |
21H04490 |
NB921, NB973 |
Dr. Masami Ouchi |
 |
JSPS Kakenhi Scientific Research (A) |
23244025 |
NB926 |
Dr. Masao Hayashi |
 |
JSPS Kakenhi Young Scientists (A) |
26707006 |
NB1010 |
Dr. Kazuhiro Shimasaku |
 |
Toray Science Foundation |
|
IB945 |
Dr. Akio Inoue |
 |
JSPS Kakenhi Young Scientists (A) |
23684010 |
EB-gri |
Dr. Marc Buie |
 |
NASA New Horizons |
NASW-02008 |
Notes:
(1) Subaru Telescope accepts user filters. When you cosider to produce new HSC filters, please read the filter policy carefully, and contact Subaru Telescope (contact person: T. Terai [ ] ) well before applying for funds.
(2) In a publication using these filters, please add the acknowledgement. For example, the acknowledgement for NB387 will be as follows.
The NB387 filter was supported by KAKENHI (23244022) Grant-in-Aid
for Scientific Research (A) through the Japan Society for
the Promotion of Science (JSPS).
Last update: February 3, 2023
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