AAS 204th Meeting, June 2004
Session 34 Detecting the First Stars and AGN
Topical Session, Tuesday, June 1, 2004, 8:30-10:00am, 10:45am-12:30pm, 2:30-4:00pm, 4:15-6:00pm, 707/709

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[34.11] Constraints on the First Stars From Lyman-alpha Emission Surveys

S. Malhotra (Space Telescope Science Institute), Large Area Lyman Alpha (LALA) survey Collaboration

The Lyman-alpha emitters discovered at z=3-6.6 show one of the properties predicted for the first generation of stars: namely large equivalent width of the Lyman-alpha line. The second prediction, that of a Helium line at 1640 angstrom is not yet fulfilled. Both these predictions arise from having unusually hot stars due to metal-free population, or a top-heavy IMF, or both. Either the Lyman-alpha emitters are not forming their first generation of stars or the pop-III models need to be constrained to produce fainter He line. Mid-IR observations of Lyman-alpha emitters can reveal if there was a previous generation of stars and potentially resolve this issue.

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