NOAO >   Observing Info >   Approved Programs >   2016B-0188

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Program Information for 2016B-0188


PI: Kaja Rotermund, Dalhousie University, KJ227826@dal.ca
Address: canada

CoI: Scott Chapman, Dalhousie University
CoI: Yashar Hezaveh, Stanford U.
CoI: Gil Holder, McGill University
CoI: Joaquin Vieira, California Institute of Technology
CoI: Kate Husband, University of Bristol
CoI: Thomas Crawford, U. of Chicago
CoI: thomas greve, University College London
CoI: Daniel Marrone, U. of Arizona
CoI: Manuel Aravena, ESO Chile
CoI: John Carlstrom, U. of Chicago
CoI: Justin Spilker, U. of Arizona
CoI: Brian Stalder, Harvard-Smithsonian Center for Astrophysics
CoI: Matthew Ashby, Harvard-Smithsonian Center for Astrophysics

Title: Detecting Dark Matter Subhalos with ALMA and GMOS-S/IFU using Strongly Lensed Submm Galaxies

Abstract: We propose to observe 5 strongly lensed, dusty, star forming galaxies with GMOS-S/IFU to map stellar absorption lines in the foreground lenses. These observations support an ALMA Cy 2/3 program (A-rated) to detect dark matter subhalos in the lens galaxies using gravitationally-induced perturbations they cause on the images of background sources. With detailed simulations, we have shown that ALMA is capable of efficiently detecting subhalos in these systems, if the abundance of subhalos is in agreement with LCDM predictions. We have built and tested a complete pipeline to search for and detect subhalos using ALMA data, which will incorporate the absorption line velocity fields mapped by GMOS-IFU. We will constrain the slope of the lensing potential (which requires mass measurements at multiple radii), which is a crucial parameter for the lens models and substructure detection. This program received a partial dataset on 1 of 5 targets in 15b (rated band-1 in Canada, but dragged down to band-2 in the I-TAC merge), and we repropose to have this program observed.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016B):  GEM-SQ/GMOSS -- 13hrs band 1 (GS-2016B-Q-20)


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NOAO >   Observing Info >   Approved Programs >   2016B-0188

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