GMOS SV program 55

	Status: in preparation Data link: not yet available Assessment: not yet available

Title:	The Fundamental Plane at High Redshift
Modes:	Imaging (for mask preparation) Multi-object spectroscopy
Additional instrument verification:	Data reduction pipeline for imaging data and MOS data; mask preparation software.
Telescope verification:	Acquisition and guiding with GMOS for tested modes. Stability of guiding over long periods of time and large hour angles.
Proposed observing sequence:	Imaging: 4-6 dithered observations in order to cover the gaps between the CCDs and clean the combined images for bad pixels and cosmic-ray-events. MOS: Multiple 30-60 min exposures, no dithering.
OT program file:	Not yet available
Science background:	Use Fundamental Plane at redshifts 0.3 to 0.6 to look for shift w.r.t. local clusters, and any change in re, sigma, Ie (effective radius, velocity dispersion, effective surface brightness) relationship. Clusters at these redshifts are a good fit to GMOS field. Effective radii and surface brightnesses can be measured from HST data. The aim is to measure the velocity dispersion from the GMOS observations. This program may be executed as a part of GMOS SV program 51.
Target(s):	Rich galaxy cluster
	Object	RA (J2000)	Dec (J2000)	z
	CL0024+16	00:26:42.6	17:09:50	0.39
Observing condition constraints:	image quality: 50%-ile (MOS), 80%-ile (imaging) sky transparency (clouds): 50%-ile, 70%-ile sky transparency (water vapour): Any sky background: 50%-ile (MOS), 80%-ile (Imaging) max air mass: 1.5
Instrument configuration:	Imaging: r', CCD binned 2x2 MOS: B600, 0.75" slitlets, CCD binned 2x2
Observing time requirements:	Imaging: 6x5 min MOS: 2 masks with faint objects in both. 5-6 hours for each mask.
SV team member(s) responsible for assessment:	Roger Davies

Last update October 12, 2001; Inger Jørgensen