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  • 15 (2021-03-05 (金) 17:11:38)

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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.

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)

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).

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).

Each stripe indicates the full range of the spectrum obtained (from shorter on the left to longer wavelength on the right). Note that any optical aberrations are not considered which would make the spectrum slightly broaden.

Available filters/grisms†

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

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

Integral Field Unit†

A compact & lightweight image-slicer IFU will be installed into the MOSU cryogenic storage.

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

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 ∼ 0.3 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

Current Status†

Coming soon.

Development Timeline†

Coming soon.