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 ListPlotList
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 ListPlotList
NB387 25.1 24.4 S16BS18A
NB391 25.8 25.0 S21BS23A
NB395 25.6 25.2 S21BS23A
NB400 26.0 25.2 S19AS20B
NB430 25.7 25.0 S20AS21B
NB468 26.3 25.8 S16AS17B
NB497 25.7 25.5 S20BS22A
NB506 26.1 26.2 S22BS24A
NB515 25.9 25.7 S15AS16B
NB527 25.9 25.8 S16AS17B
NB656 25.9 26.0 S16AS16A
NB718 25.5 25.7 S16BS18A
NB816 25.2 25.5 S15BS17A
NB872   24.2 (4) 24.9 S23AS24B
NB921 24.8 25.5 S15AS16B
NB926 24.5 25.5 S17AS18B
NB973 24.3 24.9 S17AS18B
NB1010 22.9 24.0 S18AS19B
IB945 24.5 26.2 S17AS18B
EB-gri   27.3 (5) 29.9 S22BS22B

          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 shimadaku_at_astron.s.u-tokyo.ac.jp JSPS Kakenhi Scientific Research (A) 23244022
NB391 Dr. Masami Ouchi masami.ouchi_at_nao.ac.jp JSPS Kakenhi Scientific Research (A) 15H02064
NB395 Dr. Masashi Chiba chiba_at_astr.tohoku.ac.jp JSPS Kakenhi Scientific Research (A) 17H01101, 15H02064
NB400 Dr. Masami Ouchi masami.ouchi_at_nao.ac.jp JSPS Kakenhi Scientific Research (A) 15H02064
NB430 Dr. Masashi Chiba chiba_at_astr.tohoku.ac.jp JSPS Kakenhi Scientific Research (A) 17H01101
NB468 Dr. Yuichi Matsuda yuichi.matsuda_at_nao.ac.jp JSPS Kakenhi Scientific Research (B) 25287043
NB497 Dr. Yuichi Matsuda yuichi.matsuda_at_nao.ac.jp JSPS Kakenhi Young Scientists (A) 17H04831
NB506 Dr. Masayuki Umemura umemura_at_ccs.tsukuba.ac.jp JSPS Kakenhi Scientific Research (A) 19H00697
NB515 Dr. Masashi Chiba chiba_at_astr.tohoku.ac.jp MEXT Kakenhi Scientific Research on Priority Areas 18072001
NB527 Dr. Ikuru Iwata iwata_at_naoj.org JSPS Kakenhi Scientific Research (A) 24244018
NB718, NB816 Dr. Yoshiaki Taniguchi tani_at_cosmos.phys.sci.ehime-u.ac.jp Ehime University
NB872 Dr. Nobunari Kashikawa n.kashikawa_at_astron.s.u-tokyo.ac.jp JSPS Kakenhi Scientific Research (A) 21H04490
NB921, NB973 Dr. Masami Ouchi masami.ouchi_at_nao.ac.jp JSPS Kakenhi Scientific Research (A) 23244025
NB926 Dr. Masao Hayashi masao.hayashi_at_nao.ac.jp JSPS Kakenhi Young Scientists (A) 26707006
NB1010 Dr. Kazuhiro Shimasaku shimadaku_at_astron.s.u-tokyo.ac.jp Toray Science Foundation
IB945 Dr. Akio Inoue akinoue_at_las.osaka-sandai.ac.jp JSPS Kakenhi Young Scientists (A) 23684010
EB-gri Dr. Marc Buie buie_at_boulder.swri.edu NASA New Horizons NASW-02008



Last update: August 1, 2023 Copyright © 2000-2023 Subaru Telescope, NAOJ. All rights reserved.