NOAO >   Observing Info >   Approved Programs >   2013B-0498

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Proposal Information for 2013B-0498


PI: Robert Bussmann, Harvard-Smithsonian Center for Astrophysics, rbussmann@cfa.harvard.edu
Address: 60 Garden Street, Cambridge, MA 02138, USA

CoI: Dominik Riechers, Cornell University
CoI: Julie Wardlow, UC Irvine
CoI: Hai Fu, UC Irvine
CoI: Asantha Cooray, UC Irvine
CoI: Ismael Perez-Fournon, IAC
CoI: Jae Calanog, UC Irvine

Title: Gemini-South Imaging and Spectroscopy of ALMA Lensed SMGs Discovered by Herschel

Abstract: We propose optical imaging and spectroscopic observations of a sample of candidate strong-lensing galaxies discovered in the Herschel Multi-tiered Extragalactic Survey (HerMES) that currently lack optical follow-up. All of the targets in this proposal have exquisite, high-S/N and high-spatial resolution sub-mm imaging from ALMA that resolves the background source, and many of them have HST/F110W snapshot imaging that pinpoints the position of the lens. The ALMA data will permit lens models that measure the mass of the foreground lens and the intrinsic luminosity and size of the background source. The mass of the foreground lens can only be known if a precise distance to the lens is known, hence the need for optical imaging and spectroscopy. Previous experience with Gemini GMOS-S has established that spectral features can be identified in the lensing galaxies out to at least z=0.6. We propose to obtain deep (r=24 for a 5-sigma point-source) multi-band (ugriz) wide-field imaging of 16 targets that currently lack any optical imaging from the ground. We also propose to obtain longslit optical spectroscopy of 6 targets which have obvious strong lensing morphology in the ALMA images and have an obvious, optically bright counterpart seen in the HST imaging. These data will identify the true optical counterparts to the ALMA sources, measuring their redshifts, stellar masses, and velocity dispersions.


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