FMOS Observations and Data

1
FMOS Observations and Data

• 14 January 2004
• FMOS Science Workshop

2
Introduction

• Data summary
• Observation modes
• Observation types
• Data reduction processes

3
Data Overview

• Two Hawaii 2K arrays, each identical format
• 120mm slit length, 200 fibres each 280µm diameter
• 4.7 spatial pixel spectrum
• 10 pixel spacing

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Observation Modes

• Standard star observations
• Stare mode
• Beam switching

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Observation Data Types

• Normal (stare and beam switch)
• Standard star observations
• Calibration arcs
• Flat
• Throughput mapping
• Slit dither

6
Detector calibration(Individual data frame
preprocessing)

• Dark current
• Flatfielding
• Hot/Dead pixels
• Cosmic rays

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Flat field calibration

• Spectrum location (tramline mapping)
• Scattered light measurment

8
Arc Calibration

• Wavelength
• PSF?

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Throughput mapping

• Must be done on sky (with fibres in correct
  configuration due to spine tilt effects)
• Sky lines missing (OH suppression)

10
Data reduction

• Data extraction
• Frame combination
• Flux calibration
• A,B beamswitch addition
• Header information

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Post Reduction Analysis

• Redshift
• Spectral parameters (EW,s, F)

12
Implementation?

• Data analysis during observation
• Final data reduction
• Automated pipeline
• Semi-automated pipeline (e.g. 2dFDR)
• Independent tasks