Subaru/Keck Time Exchange Program
This is the instruction for Subaru users who intend to apply for Keck telescope time
through the Subaru/Keck Time Exchange Program in S19B/2019B.
Only Japan or Taiwan researchers (i.e., those belonging to institutes in Japan or Taiwan,
or those of Japanese nationality) are eligible for this Subaru -> Keck application.
Directors of Subaru Telescope and Keck Observatory agreed to continue a time exchange program for the semester
which corresponds to 'S19B' of Subaru and '2019B' of Keck, both begin on 2019 August 1 and
end on 2020 January 31. This time exchange program is coordinated so that astronomers in each community can mutually access
unique instruments of each telescope.
Observations with both Keck and Subaru telescopes will be executed in a 'classical' mode,
except for HSC queue programs proposed by Keck users. Keck observations are always executed remotely, either from the Keck office
at Waimea or approved remote sites in the U.S. mainland. Please refer to
this Keck webpage .
Scientific merits of the proposals are reviewed and assessed in each
TAC independently (namely, proposals from the Subaru community using
Keck are reviewed by Subaru TAC).
From S19A, Keck users can submit a request of ToO observation during the exchanged-time with Subaru, and Subaru users can submit
a request during the Keck time in Subaru, too. Compensation will be done according to the policy of each observatory.
2. Available Instruments and Observing Time
Keck instruments available to the Subaru community in S19B are as follows.
There will be a one month service window during which NIRSPEC will be unavailable, but the timing of this window will be based on scientific demands of the observing community. Some proposals may be pushed into acceptable time frames to help create a window for this service.
The Keck I laser may be unavailable for a portion of the semester while undergoing an upgrade, but the timing of this or even whether or not this work will occur during the 19B semester has not yet been determined.
Keck I telescope:
OSIRIS (unavailable during November due to a service mission for the imager detector)
Adaptive Optics with Laser Guide Stars (LGS-AO) (unavailable from November through January due to upgrade work)
Adaptive Optics with Natural Guide Stars
Keck II telescope:
NIRSPEC (out of service for one month. The exact date of this downtime will be scheduled to meet the scientific demands)
Adaptive Optics with Laser Guide Stars (LGS-AO)
Adaptive Optics with Natural Guide Stars (NGS-AO)
NGS-AO can be combined with
Note that NIRSPEC+AO (NIRSPAO) is scheduled in campaign mode given limited demand for this configuration.
If there are insufficient requests for its use, NIRSPAO may not be scheduled in a given semester.
LGS-AO backup program :
Those who request LGS-AO time must prepare backup programs,
because cloudy conditions may hinder propagation of laser.
For OSIRIS + LGS-AO proposers, OSIRIS with NGS-AO is available as a backup instrument.
For NIRC2 + LGS-AO proposers, NIRC2 with NGS-AO, and NIRSPEC without AO, are available.
For NIRSPEC+LGS-AO proposers, NIRSPEC with NGS-AO or NIRSPEC without AO are available.
The unique capabilities of these Keck instruments, compared to the existing Subaru instruments,
are briefly summarized below for the Subaru community.
| A brief summary of Keck instruments available this time |
||LRIS is a multi-object spectrograph, with high sensitivity over an extensive wavelength range (3300-11000 ┼).
Compared to other spectrographs, its sensitivity is particularly high in the near-UV (3300 - 4000 ┼),
and in the red end of the visible range ( > 10000 ┼). LRIS is also equipped with an Atmospheric Dispersion
Compensator which virtually eliminates atmospheric dispersion for zenith distances less than 55 degrees, and keeps it well
below 1" up to 60 degrees.
||MOSFIRE is a near-infrared multi-object slit spectrograph with a field of view of 6'.1 x 6'.1. Up to 46 slits may be deployed.
| OSIRIS (with LGS/NGS-AO)
||OSIRIS is an infrared integral field spectrograph. It can be combined with LGS/NGS-AO.
The maximum field of view is larger than Gemini NIFS.
OSIRIS requires AO.
||HIRES is an optical high dispersion spectrograph covering from 3000┼ to 10000┼.
||DEIMOS is an optical multi-object slit spectrograph. For medium-resolution spectroscopy (R = 1000-2000),
the field of view (5x16 arcmin2) and the number of simultaneously observable objects (up to 150 objects per slitmask)
are ∼ 3 - 5 times larger than Subaru FOCAS.
||ESI is an optical spectrograph, with moderately high spectral resolution (R ~ 10000) and high throughput at >7000 ┼.
It can cover 3900-11000 ┼ in a single exposure. ESI also has a five-slice IFU available. Each slice is 1.13 arcsec wide,
4 arcsec long, for a 4.0 x 5.7 arcsec field of view.
||KCWI is a very efficient, optical integral field spectrograph with moderate to high spectral resolution (R=1000-20000),
with a configurable FoV (20" x 8.3"/16.5"/33").
||NIRES is a prism cross dispersed near-infrared spectrograph which provides simultaneous continuous wavelength coverage
from 0.94-2.45 μm with the mean resolution of R=2700. NIRES is fitted with Flexure Control System (FCS)
to minimize the effects of flexure.
| NIRC2 (with LGS/NGS-AO)
||High-spatial-resolution infrared imaging, slit spectroscopy, and coronagraphy using LGS/NGS-AO are possible.
||NIRSPEC is capable of medium-resolution (R=1000-2000) and high-resolution (R=25000) infrared spectroscopy
at 1-5 μm.|
Note that the above summary is not comprehensive. Please refer to
the Keck instruments webpages for more details of the instruments.
In S19B, up to several Keck I nights and up to several Keck II nights
are available to the Subaru community. The number of exchange nights will be determined based on the demand
of each community. The minimum amount of nights for each program is 1 night,
because we cannot accept a number of short programs.
Proposals requesting Target of Opportunity (ToO) observations are not accepted.
3. Proposal Preparation for Programs using Keck Telescopes
|Table 1. Guide for Proposers Applying for Keck Time|
|Phase-I Subaru Submission
||Step 1. Proposers should submit their proposals via
the webform by the deadline in Subaru S19B Call for Proposals
(namely, noon, 2019 March 7, JST).|
3-1. Step 1. Phase-I Submission to Subaru ProMS
Proposers intending to apply Keck observations via this Subaru Call for Proposals should access
the ProMS 2.0 page to fill the webform.
Proposals from the Subaru community to use Keck are treated as ones of Subaru Open Use Programs and
are reviewed in the same way as other Subaru proposals.
When a proposal has been successfully accepted, the proposer will then be
asked to fill out the Keck Proposal Coversheet.
How to complete the Application Form:
Please follow the instructions detailed in 'How
- "1-12"(Observing Run):
- For DEIMOS and LRIS proposers, if Subaru/FOCAS and/or Gemini/GMOS are acceptable as backup instruments,
please specify either of them at "2nd choice instruments".
- "1-15"(Observing Method and Technical Details):
- Describe by referring to Keck Instrument page.
4. Phase-I Contact
Please contact .
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