NOAO > Observing Info > Approved Programs > 2012A-0268
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NOAO > Observing Info > Approved Programs > 2012A-0268 |
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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: Aprajita Verma, Oxford, UK
CoI: Dan Smith, University of Nottingham
CoI: Mark Swinbank, Durham
CoI: Loretta Dunne, Nottingham, UK
CoI: Mattia Negrello, Open University
CoI: Simon Dye, Cardiff, UK
CoI: Steve Eales, Cardiff, UK
CoI: Ros Hopwood, Open University
CoI: Rob Ivison, Edinburgh, UK
CoI: Matt Jarvis, University of Hertfordshire, UK
CoI: Steve Maddox, Nottingham, UK
CoI: Emma Rigby, Nottingham, UK
Title: Longslit Spectroscopy of Lensing Galaxies Discovered in the Herschel-ATLAS
Abstract:
We propose optical spectroscopic observations of a sample of 12
strong-lensing galaxies discovered in the Herschel Astrophysical Terahertz
Large Area Survey (H-ATLAS) that currently lack optical spectroscopic
follow-up. Redshifts to the background lensed galaxy are available for all 12
systems and high-spatial resolution sub-millimeter observations which allow
detailed gravitational lens models to be constructed are available for 5/12
(with the remaining 7 proposed for 2012A sub-millimeter observations). These
models provide both a measure of the magnification of the background source
as well as the Einstein radius of the foreground lens. The Einstein radius
can in turn be used to determine the mass of the lens, but only if a precise
distance to the lens is known. 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 a series of longslit observations of all
twelve lensing galaxies to determine their redshifts and velocity
dispersions. The velocity dispersions can be compared directly with the
masses derived from the lens modeling as well as stellar masses obtained with
stellar population synthesis modeling to test the relationship of dark and
light matter in galaxies out to z=0.6 and possibly beyond.
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 > 2012A-0268 |
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