Summary の履歴(No.1)

Brief Introduction to SWIMS†

Simultaneous-color Wide-field Infrared Multi-object Spectrograph, or SWIMS, is capable of

simultaneous imaging/spectroscopy of 0.9-1.45 and 1.45-2.5 μm wavelength ranges
imaging of maximum φ9.6 arcmin FoV (6.6 × 3.3 arcmin^2 on Subaru)
having a unique set of 8 medium-band and 6+4 narrow-band filters (e.g. SWIMS-18 survey)
multi-object (max ∼ 40 objects) slit spectroscopy with R ∼ 1000
integral-field spectroscopy with FoV of 17 × 13 arcsec^2

and

on TAO 6.5m telescope, large amount of observing time with excellent atmospheric window is available.

SWIMS	Optical Components

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Instrument Papers†

Motohara, K., et al., Development of a simultaneous two-color near-infrared multi-object spectrograph SWIMS for the TAO 6.5-m telescope, Proceedings of the SPIE 9147, 91476K (2014)
Takahashi, H., et al., Development of multi-object spectroscopy unit for simultaneous-color wide-field infrared multi-object spectrograph, Proceedings of the SPIE 9147, 91476N (2014)
Todo, S., et al., Optimization and performance of H2RG detectors and SIDECAR ASICs for SWIMS, Proceedings of the SPIE 9154, 91541L (2014)
Kitagawa, Y., et al., Concept and optical design of the near-infrared integral field unit for SWIMS, Proceedings of the SPIE 9151, 91514P (2014)

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Field of Views†

Field of view (FoV) of the telescope is covered with multiple HAWAII-2RG arrays (λ_{cut}=2.5 μm, ∼ 0.2-mm or ∼ 10-pixel gap between arrays).

	TAO	Subaru
Imag. FoV	φ9.6' (∼ 8.6' × 8.6')	6.6' × 3.3'
Spec. FoV	3.7' × 8.6'	2.8' × 3.3'
# of arrays per arm	4 (4096 × 4096 pixles)	2 (4096 × 2048 pixels)
Pixel scale (arcsec/pix)	0.126	0.096
Array configuration

Light-shaded regions show the FoV for the imaging mode while dark-shaded regions for the spectroscopy mode (for full range of spectra).

Black dots represent positions of source in the imaging mode which are also equivalent to the spectral positions of undeviated wavelength (λ ∼ 1.027 μm for blue, ∼ 1.734 μm for red).

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Available filters/grisms†

	Blue (0.9-1.45 μm)	Red (1.45-2.5 μm)
Broad-band	Y (λc=1.03, Δλ=0.09), J (1.25, 0.16)	H (1.64, 0.30), Ks (2.14, 0.32)
Medium-band	J1 (1.17, 0.13), J2 (1.29, 0.12)	H1 (1.50, 0.02), H2 (1.61, 0.11), H3 (1.73, 0.12), K1 (2.02, 0.14), K2 (2.17, 0.14), K3 (2.31, 0.13)
Narrow-band	NB1244# (1.244, 0.012), NB1261# (1.261, 0.012), Paβ (1.292, 0.040), Paβ-off (1.326, 0.034)	NB1630# (1.630, 0.016), NB1653# (1.653, 0.016), Paα (1.875, 0.020), Paα-off (1.945, 0.040), NB2137# (2.137, 0.021), NB2167# (2.167, 0.021)
Grism	zJ (2.49 Å/pix, R ∼ 700-1100 w/ 0.5" slit)	HKs (4.90 Å/pix, R ∼ 600-1000 w/ 0.5" slit)

Filters followed by "#" are those for SWIMS-18 survey. Requests for use for any other purpose will be also welcomed.

Transmission curves

ASCII data for each filter transmittance will be available soon. Please contact us for urgent use.

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Integral Field Unit†

A compact & lightweight image-slicer IFU will be installed into the MOS cryostat.

Note that the following parameters may be subject to be changed.

	TAO	Subaru
λ (μm)	0.9-1.45 (blue) & 1.45-2.5 (red)
R (=λ/Δλ)	900-1400 (blue), 700-1200 (red)
FoV	18.4" × 13.7"	14.0" × 5.2"
# of slice	26	13
Slice width	0.5"	0.4"

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Sensitivity†

Total throughput including the telescope is estimated to be ∼ 0.4 for imaging and ∼ 0.3 for spectroscopy.

Expected sensitivities (AB mag) on the Subaru telescope are calculated with assumptions of seeing size=0.5 arcsec (photometry aperture radius=0.5 arcsec for point source), exposure time=1 hr, and S/N=5.

Sensitivities on the TAO 6.5-m telescope are supposed to be ∼ 0.2 mag shallower due to smaller light-collecting area.

Imaging
Point source Y=25.3, J=24.9, H=24.6, Ks=24.6

Extended source Y=27.6, J=27.2, H=26.9, Ks=26.9

Spectroscopy
Point source J=21.4, H=20.7, Ks=20.7

Extended source J=21.1, H=20.4, Ks=20.3

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Current Status†

Coming soon.

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Development Timeline†