NOAO >   Observing Info >   Approved Programs >   2002A-0107

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Proposal Information for 2002A-0107


PI: Sylvain Veilleux, University of Maryland, veilleux@astro.umd.edu
Address: College Park, MD 20742, USA

CoI: David S. Rupke, University of Maryland
CoI: David B. Sanders, Institute for Astronomy, University of Hawaii

Title: Superwinds in Luminous Infrared Galaxies: The Spring Sample

Abstract: Large-scale galactic outflows, or superwinds, are ubiquitous in local star-forming galaxies and in high-z Lyman-break galaxies. They likely have a substantial impact on galaxy formation and evolution, and may heat and enrich the intergalactic medium. However, the nature and frequency of occurrence of superwinds over most of cosmic history remains unquantified. To address these issues, we are conducting a survey of starburst-dominated luminous and ultraluminous infrared galaxies in the redshift range 0.1 < z < 1. A pilot study of a handful of objects at z < 0.3 using Keck II in February 2001 was successful in detecting winds and measuring their properties. To confirm our preliminary results, complete our sample at low z, and extend the survey to higher z, we propose to use the R-C spectrograph (used at moderately high resolution) on the KPNO 4 m for objects at z < 0.3 and the Red Channel spectrograph (in echellette mode) on the MMT for z > 0.3. Overall, this project will greatly extend the small range of z that previous studies have covered, and will allow us to observe superwind trends as a function of z. Our targets are infrared- luminous galaxies from the IRAS 1 Jy sample, the ISOPHOT Deep Field, and the FIRST/FSC sample. These are good objects in which to look for winds due to their high star-formation rates. Furthermore, high-z ultraluminous infrared galaxies may be a subset of Lyman-break galaxies, which typically contain outflows. The technique we propose, looking for blueshifted interstellar absorption lines, has proven effective in measuring winds at both low and high z. This survey is part of a Ph.D. thesis project (D. Rupke).


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