Role of FOCAS

FOCAS serves as a versatile optical instrument with multi-object capability, enabling detailed observations of various targets in astronomy. Its recent proposals focus on reducing workloads, enhancing spectroscopy, and exploring new observation techniques to meet evolving demands. The instrument's adaptability is demonstrated through specialized observing modes like fast photometry and on-chip folding for unique research opportunities.

• FOCAS
• Versatile Instrument
• Multi-Object Capability
• Targeted Observations
• Astronomy

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1. Role of FOCAS Takashi Hattori (as FOCAS SA) 12/9/2014

2. FOCAS not unique better scores in stability/work-load (but there is a long history of repair/improvement ...) decreasing demand? high demand low success rate (fraction of accepted proposals) unavoidable for a utility instrument?

3. FOCAS submitted proposals S08A S08B S09A S09B S10A S10B S11B S12A S12B S13A S13B S14A S14B S15A IMAG 2 2 2 1 1 1 2 1 0 1 0 1 1 1 LS 15 15 12 13 8 8 9 8 6 6 6 7 5 12 MOS 12 9 6 7 7 11 15 6 5 5 7 10 10 9 POL 1 3 2 2 2 2 1 3 3 2 5 6 2 5 TOTL 30 29 22 23 18 22 27 18 14 13 18 24 18 27 30 25 IMAG 20 LS 15 MOS 10 POL TOTL 5 0 S08A S08B S09A S09B S10A S10B S11B S12A S12B S13A S13B S14A S14B S15A

4. FOCAS submitted proposals trend in recent proposals decrease in true multi-object spectroscopy single primary target in the field reference stars, secondary targets, secure alignment for a faint target increase in polarimetry? S13B to S15A follow-up spectroscopy of rare objects (SN/QSO) found in HSC data (S14B, S15A)

5. Role of FOCAS "versatile optical instrument with multi-object capability" before multi-object spectroscopy follow-up spectroscopy of deep fields SDF, SXDS, ... now versatility/utility variety of observing mode follow-up/detailed-observation of interesting targets deep spectroscopy, polarimetry, etc. test of new observation technique

6. to reduce work-load usage of IRM2 still want to use ADC need to modify Mitsubishi software buffle for IRM2 stop operation and to see how it goes

7. versatility/flexibility special observing mode fast photometry (~1sec) PI : Andrea Richichi put a star on the slit exposure charge transfer exposure charge transfer Star Slit charge transfer

8. versatility/flexibility special observing mode on-chip folding PI : Mikio Morii phase resolved imaging- polarimetry of pulsars extra-ordinary light ordinary light

9. versatility/flexibility IFU for FOCAS PI : Ozaki (TMT Project Office) supported by grant-in-aid (FY2014-) type image slicer R=87mm ( 6arcmin) Slit for sky FoV 13".5 x 9".2 Pupil mirrors Folded mirror slit width 0".4 Magnification optics: Spherical mirror Slicer R=100mm Telescope focal plane Magnification optics: Lens Slit mirrors Pick-off mirror R=200mm

10. versatility/flexibility IFU for FOCAS fabrication of components test and installation in 2015