FMOS: Fiber Multi Object Spectrograph

Introduction

FMOS is a fiber-fed multi-object spectrograph. The Echidna fiber positioner system configures 400 fibers with an accuracy of 0.2 arcsec rms in the 30-arcmin diamter field of view at the Subaru prime focus and these fibers are extracted as spectra by the two spectrographs (IRS1 & IRS2). A mask mirror is installed in these spectrographs for OH airglow suppression (OHS). The spectral coverage is from 0.9 μm to 1.8 μm. This is observed at one exposure entirely with R=600 in the Low Resolution mode (LR), while it is divided into four bands ("J-short", "J-long", "H-short" & "H-long") with a ~0.25 μm coverage and one of them is observed at one exposure with R=2200 in the High Resolution mode (HR).

!! Important notes for S12A observers !! We still request S12A observers to download an older version (20101007 version) from the link below and prepare s2o files using it. In fact, there are several known issues on this version, but workarounds are available for most of them. S2O files created by this version have been working in observations. Spine-to-Object (S2O) allocation software (20101007 version) for Linux and Mac OS X (10.4 or higher). An HTML user manual is available in the "doc" directory. Several examples of catalogs are also available in the "examples" directory. Known issues on this 20101007 version

Contents

• System Overview
• Basic Instrument Parameters
• Performance
• Measured system throughput
• Guideline of sensitivity
• Spectra from engineerng observations
• FMOS spectrum simulator
• Notable characteristics
• Time variation of spectral throughput in several fibers
• Nonlinear time variation of bias component on the IRS2 detector
• Information for Proposal Applicants
• Observation procedure
• Data acquisition for flat fielding and calibration
• Operation of high resolution mode
• Proposal checklist
• Information for Observers
• Planning observation
• Observation checklist
• Preparation for an OPE file
• Text file
• PDF file (NOTE: Supplementary information is available therein).
• List of OH airglow masks
• Spine ID and spectrum ID matchup
• FIBRE-pac: FMOS data reduction package

Further information

Questions regarding these pages should be directed to Kentaro Aoki ( ). Please note that all numbers on these pages are subject to change as the characteristics and performance of FMOS are better determined.

References

"The Fibre Multi-Object Spectrograph (FMOS) for Subaru Telescope"

Kimura, M., et al. 2010, Publication of The Astronomical Sciety of Japan, Vol. 62, 1135.

"FIBRE-pac: FMOS image-based reduction package"

Iwamuro, F., et al. 2011, Publication of The Astronomical Sciety of Japan, in press (arXiv.1111.6746)

"FMOS: the fiber multiple-object spectrograph: Part VI. Onboard performances and results of the engineering observations"

Iwamuro, F. et al. 2008, Proc. of SPIE, Vol. 7014, 26

"Performance of Echidna fiber positioner for FMOS on Subaru"

Akiyama, M., et al. 2008, Proc. of SPIE, Vol. 7018, 94

"Echidna: the engineering challenges"

Brzeski, J., et al. 2004, Proc. of SPIE, Vol. 5492, 1228

"Integration, commissioning, and performance of the UK FMOS spectrograph"

Dalton, G., et al. 2008, Proc. of SPIE, Vol. 7014, 127

"Design and construction of the fibre system for FMOS"

Murray, G., et al. 2008, Proc. of SPIE, Vol. 7014, 186

"Cryogenic tests of volume-phase holographic gratings: results at 100 K"

Tamura, N. et al. 2006, Applied Optics, Vol. 45, 5923

Last updated: February 4, 2012