NOAO >   Observing Info >   Approved Programs >   2003B-0202

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Proposal Information for 2003B-0202


PI: John Feldmeier, Case Western Reserve University, johnf@bottom.astr.cwru.edu
Address: Dept. of Astronomy, 10900 Euclid Ave, Cleveland, OH 44106, USA

CoI: Robin Ciardullo, Penn State University
CoI: George Jacoby, WIYN Observatory
CoI: Caryl Gronwall, Penn State University
CoI: Pat Durrell, Penn State University
CoI: Chris Mihos, Case Western Reserve University

Title: Gemini spectroscopy of Fornax intracluster planetary nebulae and Lyman (alpha) galaxies at z=3.13

Abstract: Intracluster starlight (ICL) can be a unique and powerful tool for studying galaxy clusters. Intracluster planetary nebulae (IPN) are an excellent tracer of ICL, and they are the best way to obtain kinematical information. Over the past several years, we have carried out [O III] (lambda) 5007 surveys for IPN in the Virgo and Fornax clusters. We now propose follow-up spectroscopy using Gemini and the GMOS spectrograph to confirm the nature of the IPN candidates and measure their velocities. Since IPN should be found primarily on radial orbits, their velocities will allow us to measure Fornax's gravitational potential. Theoretical studies predict that some of the intracluster stars exist in coherent arc-like streams whose frequency depends on cosmological parameters. Our data will place limits on the existence of such streams, and test models of intracluster star production. In addition, our spectroscopic observations will allow us to study a completely different type of object: Lyman (alpha) galaxies at z=3.13. These objects, which appear to be dust-free, strongly star-forming galaxies, mimic the properties of IPN, and are ~ 50% of our sample. We will be able to explore their star forming properties and the nature of outflows


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