GMOS SV Program 51
You are here
Status: Completed Data link: not yet available Assessment: not yet available |
||||
Title: | Galaxy evolution: Observations of rich galaxy clusters | |||
Modes: | Imaging (for mask preparation) Multi-object spectroscopy |
|||
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. |
|||
OT program file: | Not yet available | |||
Science background: |
This program merges several programs in SV plan with a common science driver to study galaxy evolution (stellar populations and dynamics and also gas dynamics and chemical composition of the gas). We propose to obtain imaging and spectroscopy of galaxies in rich clusters at intermediate redshifts. Both simple physics, and also more detailed simulations, predict that one should see evolution in the observed correlations between velocities of stars and gas and galaxy luminosities and radii (i.e. the Fundamental Plane for E/S0 galaxies and the Tully-Fisher relation for spirals). For E/S0 galaxies, it is also predicted that the correlations between stellar velocity dispersions and strengths of the absorption lines of magnesium, iron and hydrogen should be affected by galaxy evolution. We propose to obtain data needed to test these predictions and improve our understanding of galaxy evolution. The sub-programs incluced in this program include observations of galaxies in clusters from z~0.2 to z~0.8, and are aimed at studying both spiral galaxies and E/S0 galaxies. The actual observations to be carried out will most likely focus on one rich cluster and include all types of galaxies. Other SV programs have related science goals: Program 56 "Starburst galaxies at intermediate redshifts"; program 59 "Stellar populations of dE/dS0 galaxies"; program 60 "Dynamics of E/S0 galaxies"; program 70 "IFU observations of bright cluster galaxies". |
|||
Target(s): | Rich galaxy cluster | |||
Object | RA (J2000) | Dec (J2000) | z | |
MS0015.9+1609 | 00:18:33.3 | 16:26:36 | 0.546 | |
RXJ0142.0+2131 | 01:42:02.6 | 21:31:19 | 0.28 | |
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', i', CCD binned 2x2 MOS: z=0.3 B600, central wavelength=600nm, 0.75" slitlets, CCD binned 2x2 MOS: z=0.55 B600, central wavelength=680nm, 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: | Inger Jørgensen; Roger Davies; Marianne Takamiya; Jeremy Allington-Smith; Reinaldo de Carvalho |
Last update October 12, 2001; Inger Jørgensen