NIRI SV observation 6

	Status: observations complete Data link: Public data page Assessment: under way

Mode:	Wide-field Imaging
Additional instrument verification:	Data reduction pipeline for imaging data, identification and removal of cosmic ray spikes; sensitivity of NIRI to faint fuzzy objects; image flatness and noise spatial structure.
Telescope verification:	Consistency of repeated offsetting/dithering for sky subtraction.
Proposed observing sequence:	developed manually
OT program file:	available
Science background:	Gemini Near-IR Deep Cluster Imaging Deep J and Kp images of a 2' x 3' portion of a future GMOS field, primarily to acquire complimentary data to derive photometric redshifts of galaxies in the 1 < z < 2.5 region. This is basically the only way to identify galaxies in this redshift range (where star formation appears to peak) and will allow Gemini to investigate galaxy evolution continuously from z="0" to z="5."
Target(s):
	Object	approx. RA (2000)	approx. dec (2000)	redshift
	MS 1621.5+2640	16h 23m 37.1s	26d 34m 58s	0.426
Observing conditions:	image quality: 50%-ile sky transparency (clouds): 50%-ile (photometric) sky transparency (water vapour): Any sky background: 80%-ile max air mass: 2.0
Observing time achieved:	18,240 sec = 5 hr at Kprime and 16,800 sec = 4.67 hr on the central overlap region (1 arcmin x 2 arcmin) and half that on the flanking fields (for a total of 1 arcmin x 3 arcmin)
Data release date:	Nov. 1, 2001
SV team member(s) responsible for assessment:	David Crampton, Simon Morris, Inger Jorgensen

Last update November 1, 2001; Joe Jensen