NOAO > Observing Info > Approved Programs > 2013B-0498
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NOAO > Observing Info > Approved Programs > 2013B-0498 |
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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.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2013B-0498 |
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