H(alpha) Narrow-band Imaging of z ~ 0.8 Galaxy Clusters

Details H(alpha) Narrow-band Imaging of z ~ 0.8 Galaxy Clusters H(alpha) Narrow-band Imaging of z ~ 0.8 Galaxy Clusters

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..118f&link_type=abstract

NOAO Proposal ID #2009B-0118

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We request 2 nights of 4.0-m time to complete narrow-band imaging centered on the observed wavelength of Hα for two z=0.8 galaxy clusters using NEWFIRM and a custom narrow-band filter. A third cluster will be targeted during 2010A. The narrow-band filter is designed to sample a region of the IR window that is relatively free from OH emission; we are thus able to detect low star-formation rates (SFRs) (2 smy) in a reasonable amount of observing time. NEWFIRM's large field- of-view allows simultaneous imaging of the cluster center and surrounding infall region, an area where galaxy transformation is likely taking place. These data, in conjunction with a companion survey of z=0.8 field galaxies led by CoI Lee, will provide a census of SFRs over the full range in galactic environments at an epoch when the Universe was half its current age. In contrast, most field surveys of intermediate-redshift galaxies deliberately avoid clusters and thus fail to survey the densest galactic environments. The z=0.8 epoch probes a cosmologically interesting time in cluster evolution, when clusters were only half their present mass and accretion rates were higher. This study is thus uniquely suited to determine whether clusters speed a galaxy's evolution from star-forming to quiescent.

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