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| Status: in preparation Data link: not yet available Assessment: not yet available |
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| Title: | Stellar Populations of E and S0 Galaxies in z=0.2-0.8 Clusters | |||
| Modes: | Imaging (for mask preparation) Multi-object spectroscopy |
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| Additional instrument verification: | Data reduction pipeline for imaging data and MOS data; mask preparation software; use of tilted slits. | |||
| 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. |
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| OT program file: | Not yet available | |||
| Science background: |
Galaxy evolution can be studied by establishing the Fundamental Plane and relations between absorption line strengths and velocity dispersions for intermediate redshift clusters. By comparison to low redshift data strong constrains can be put on models for galazy evolution. We plan to obtain data for E and S0 galaxies in intermediate redshift galaxies. A z=0.4-0.5 cluster demonstrates GMOS and as a strong competitor in this field and will involve end-to-end test of MOS mode. A z=0.8 cluster shows Gemini/GMOS at cutting-edge science. This program may be executed as a part of GMOS SV program 51. |
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| Target(s): | Rich galaxy clusters | |||
| Object | RA (J2000) | Dec (J2000) | z | |
| RXJ0142.0+2131 | 01:42:02.6 | 21:31:19 | 0.28 | |
| MS0015.9+1609 | 00:18:33.3 | 16:26:36 | 0.546 | |
| MS1137.5+6625 | 11:40:23.3 | 66:08:41 | 0.78 | |
| 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 |
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| Instrument configuration: | Imaging: r', i', CCD binned 2x2 MOS: For z=0.3 cluster B600, central wavelength=600nm, 0.75" slitlets, CCD binned 2x2 MOS: For z=0.55 cluster B600, central wavelength=680nm, 0.75" slitlets, CCD binned 2x2 MOS: For z=0.8 cluster R400, 0.75" slitlets, CCD binned 2x2 |
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| Observing time requirements: | Imaging: 6x5 min MOS: 2 masks with faint objects in both. 5-6 hours for each mask. |
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| SV team member(s) responsible for assessment: | Inger Jørgensen; Marianne Takamiya | |||
Last update October 12, 2001; Inger Jørgensen