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MOIRCS and FMOS for cluster studies

MOIRCS and FMOS for cluster studies. MOIRCS and FMOS for cluster studies. Ichi Tanaka Astronomical Institute, Tohoku University. Contents:. Intruduction and the current status of MOIRCS MOIRCS and FMOS Distant cluster studies as a target of FMOS-MOIRCS joint project.

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MOIRCS and FMOS for cluster studies

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  1. MOIRCS and FMOS for cluster studies MOIRCS and FMOSfor cluster studies Ichi Tanaka Astronomical Institute, Tohoku University

  2. Contents: • Intruduction and the current status of MOIRCS • MOIRCS and FMOS • Distant cluster studies as a target of FMOS-MOIRCS • joint project

  3. 1.Intruduction and Current Status of MOIRCS

  4. MOIRCS:Multi-Object Infrared Camera and Spectrograph for Subaru T. Ichikawa T. Nishimura C. Tokoku R. Suzuki Y. Katsuno & K. Omata/ M. Konishi/ T. Yoshikawa et al.

  5. Performance of MOIRCS

  6. Large FOV: CISCO versus MOIRCS (From GOODS 6hr Ks data)

  7. This is the MOIRCS view! 4' x 7'

  8. Components of MOIRCS Slit mask exchange unit Main dewar optics detector Support structure Peripherals Suzuki et al. Subaru UM 2002

  9. Optical Unit/ Bench/ Filter/ Grism Slit Exchanging Unit Peripherals Support Structure/ Connector Main Dewer Detector

  10. The Design of MOIRCS --- dual camera & spectrograph system Light MOS plate exchanging unit Focal Plane Cooler Filters/Grism Cooler detector Front View Side View Inside is Cooled to 77K

  11. OPTICAL Rayout of MOIRCS

  12. Imaging mode Spectrograph mode Object on the center is devided 4 arcmin. Usable for Spectroscopy! Unusable detector area (imaging) ~30 arcsec

  13. MOIRCS is the MOS in zJHK! Cooled mask slot / robotic mask in-out mechanism Max 50 slitlets / 24 masks available for a night

  14. Grisms: R=500 gratings for zJ / HK wavebands R=1300 forJ,H,K bands zJ R500 HK R500

  15. Slit Mask Exchanging Unit Linear Actuator （can handle 0.01mm accuracy） Gate Valve Mask Dewar is detachable. Mask Dewar with the exclusive cooler (cooled to 150K) can hold 24 slit masks Useful for efficient mask exchange!

  16. Slit mask exchanging mechanism ◎Procedure 1．Setting mask, vacuuming, cool down 2．Rotate corrousel for selecting mask 3.Gate valve opens, grab a mask by robot arm 4. pick up a mask, rotate, set to the focal plane 5. Close Gate valve, start obs. (~15minutes.) Room temperature test is successful

  17. First Light is soon.Current plan: early March, 2004 !!! MOIRCS Science Workshop: Feb. 27/28 in Sendai !!! Registeration deadline … Jan. 31, 2004 A planned GT science will be intensively introduced and discussed on WS. Contributions are greatly welcomed!

  18. 2. MOIRCS and FMOSComparisonfor scientific purpose

  19. MOIRCS and FMOS FMOS: R=700 - 2400 zJH with OHS 400 in 30' FOV. MOIRCS: R=500 - 1300 zJHK <50 in 4'x7' FOV. ECHIDNA Rayout FMOS … sparsely distributed targets => e.g. Field Objects MOIRCS … high density region => e.g. Clusters

  20. Suprime-Cam F.O.V. FOCAS F.O.V. MOIRCS and FMOS MOIRCS FOV FMOS: Good match to Suprime-Cam --- photo-z MOIRCS: Good match to FOCAS --- optical spectroscopy

  21. MOIRCS & FOCAS … pensil beam survey for whole galaxies • [rest optical spectra for allgalaxies, but still large cosmic variance] • FMOS & SpCam-WFCAM … much less cosmic variance • [good for large-scale clustering, global cosmic SFR history, & follow-up of the rare objects (sub-mm sources/ EROs/ AGNs) but needs a careful target selection by photo-z] For General Field Survey • *** Only FMOS can do an efficient follow-up of SupCam 30'x30'data *** For Studies of Cluster environment … FMOS-MOIRCS joint observation is most efficient!

  22. 3.Distant Cluster Sudies as a Target of FMOS-MOIRCS Joint Project

  23. Distant Clusters of Galaxies • Topic: • Star-formation activities in cluster environment • Large-scale clustering and star-formation • Early-epoch of clusters How the star-formation activities has ceased in clusters? What is the relationship between the dynamical evolution of clusters and the galaxy evolution in clusters? What properties do massive cluster galaxies have in their very young epoch?

  24. For understanding galaxy evolution in cluster environment … • SFR measurement: • Ha, Hb, [OII] (lines) …MOIRCS/FMOS • Hd absorption (continuum for z>1 FMOS OHS!) • High density regions … MOIRCS (z>1); FOCAS(z<1) • Galaxies in the outskirts of clusters … FMOS • Structure, cluster dynamics: often >10Mpc … FMOS! • … no efficient way to do optical spectroscopy for faint galaxies! • Complex cluster merger ・・・ < a few Mpc …MOIRCS

  25. A supercluster at z=0.54Connolly et al. (1996) known clusters at z=0.54 Galaxies with pectroscopic redshift~0.54 Galaxies with photometric redshift~0.54 Suprime-Cam data by the PISCES project (Kodama et al.)

  26. CL 0016

  27. LQG10 … group of 23 QSOs at z~1.1 (Crampton et al. 1989) : LSS at z~1.1? Pilot works by Tanaka et al. (2000,2001), Yamada et al. (1997) A supercluster search for a large QSO group at z=1.1 Area A. Area C. Our observed area by Suprime-Cam (i', z') Area B. 2 degrees

  28. Results i’-z’color selection for old red glalaxies at z=1.1 … some hint for superstructure associated with LQG10 Area A Area B Density enhancement mildly traces QSO distribution

  29. Area A. ? Area C. Area B. highest density peaks ・・・ MOIRCS/FOCAS is good Others … only sparsely distributed The whole structure / galaxy properies at the outskirts of clusters ==> ONLY FMOS can access!

  30. Example of the hottest X-ray cluster RXJ 1347.5-1145 Redshift by Cohen &Kneib (2002) SupCam data by Miyazaki (private) Substructure? 47 spectra … still not enough S-Z by Komatsu et al. (2001)

  31. PISCES project (Subaru press relase 2003) Distant clusters …. More complex! Examples of two clusters at z=0.8 Gioia et al. (1999)

  32. Summary • MOIRCS will soon achieve First Light • (Workshop on 27-28 Feb.) • FMOS, MOIRCS & Suprime-Cam can make up a good inter-collaborative project for intensive studies of cluster environments at z>1.

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