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イメージスライサー型可視光面分光ユニットの開発 Development of an integral field unit (IFU) with an image slicer

2011/01/18 Subaru Future Instrumentation Workshop. イメージスライサー型可視光面分光ユニットの開発 Development of an integral field unit (IFU) with an image slicer. Shinobu Ozaki , Satoshi Miyazaki, Takuya Yamashita, Takashi Hattori, Norio Okada, Kenji Mitsui (NAOJ). ＋. ＋. ＋. ＋. ＋. ＋. ＋.

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イメージスライサー型可視光面分光ユニットの開発 Development of an integral field unit (IFU) with an image slicer

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  1. 2011/01/18 Subaru Future Instrumentation Workshop イメージスライサー型可視光面分光ユニットの開発 Development of an integral field unit (IFU) with an image slicer Shinobu Ozaki, Satoshi Miyazaki, Takuya Yamashita, Takashi Hattori, Norio Okada, Kenji Mitsui (NAOJ)

  2. ＋ ＋ ＋ ＋ ＋ ＋ ＋ Integral Field Spectroscopy is a powerful tool • 3D data (XY+λ) is simultaneously obtained. • Science example • Detailed studies of AGN emission line regions • Velocity structure • Excitation structure NGC1068 [OIII]l5007 channel map (Gerssen et al. 2006)

  3. Project outline FOCAS @ Subaru WFOS @ TMT

  4. Why image slicer type IFU? • Advantage • Dead space on a detector is the smallest. • Drawback • Difficulty of fabrication. From ifu wiki Diminishing thanks to technology progress

  5. IFU optical layout Based on GNIRS at Gemini observatory. Side view Top view Pupil mirrors Pickup mirror From telescope Pseudo slits To spectrograph Field optics Enlarger We are considering another possible layout. We select the better layout, comparing these two. Slicer

  6. IFU parameters *: Aspect ratio of FOV is fixed to be about 1.4.

  7. Manufacturing methods for mirrors • High precision machining for metal • Advantage • Fast fabrication speed • Easy to fabricate an aspheric surface • Can make monolithic module • Drawback • Only a few experiences in astronomical instrumentation • Polishing for glass • Advantage • Achievable low surface roughness • Drawback • Slow fabrication speed • Difficult to fabricate an aspheric surface • Cannot make monolithic module Manufacturing methods are closely coupled with optical layout. We choose the method after the decision of the optical layout.

  8. Fabrication sample of high precision machining Diamond turning TOSHIBA MACHINE CO.,LTD Surface roughness : Ra 0.7nm

  9. Comparison with other instruments * (Information amount) = (Spatial element #) x (Spectral element #)

  10. Comparison with future instruments * (Information amount) = (Spatial element #) x (Spectral element #)

  11. Schedule • FY2010 • Parameter search (Done) • Decision on optical layout ( till end of Jan.) • Test fabrications of each modules (from Feb.) • FY2011 • IFU for FOCAS • Detailed design • Fabrications • Assemble • Performance verifications • FY2012 • Test observations with FOCAS+IFU • Start developing the IFU for TMT/WFOS

  12. Budgets • Applied for Grants-in-Aid for Scientific Research (Kiban-B) • Applied for NAOJ internal budget

  13. Summary • We are developing the slicer type optical IFU. • 1st step: IFU for FOCAS/Subaru • 2nd step: IFU for WFOS/TMT • FY2012: First light of IFU for FOCAS

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