NOAO >   Observing Info >   Approved Programs >   2016A-0199

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Program Information for 2016A-0199


PI: Brenda Frye, U. of Arizona, bfrye@as.arizona.edu
Address: Department of Astronomy and Steward Observatory, 933 AVENUE, TUCSON, AZ 85721-0065 USA

CoI: Nicole Nesvadba, Institut d'Astrophysique Spatiale
CoI: Greg Walth, U. of Arizona
CoI: Raoul Canameras, Institut d'Astrophysique Spatiale

Title: Spectroscopic redshifts of the lenses producing the brightest high-z sources in the Planck all-sky survey

Abstract: We propose multi-object spectroscopy with GEMINI-N/GMOS to characterize the lensing structures of 4 of the brightest, most strongly gravitationally lensed high-redshift galaxies on the sub-mm sky seen with the Planck all-sky survey. These galaxies provide a unique opportunity to study the processes that drive, regulate, and limit the intense star formation in the most rapidly growing galaxies on the scales where local energy injection from winds, turbulence, and perhaps cosmic rays prevails over large-scale galaxy-wide phenomena. Translating their observed into physical properties requires robust lens modelling, which GMOS will help us provide. We will measure accurate spectroscopic redhifts of 10-30 foreground galaxies -- all in extended structures like intermediate-redshift groups or low-mass clusters -- to confirm their cluster/group membership, measure their velocity dispersion (a proxy of mass), and unravel the astrophysical nature of the overall structure: Single cluster? Merging groups? Substructure within a dense filament? Together with already scheduled HST/WFC3 imaging, the proposed observations will boost the accuracy of our lens modelling by factors of a few and are a vital and missing piece of our overall analysis.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016A):  GEM-NQ/GMOSN -- 10hrs band 1 (GN-2016A-Q-30)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0199

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