NOAO >   Observing Info >   Approved Programs >   2014A-0339

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Proposal Information for 2014A-0339


PI: Jonathan Hargis, Haverford College, jhargis@haverford.edu
Address: Department of Physics and Astronomy, 370 Lancaster Ave, Haverford, PA 19041, USA

CoI: Beth Willman, Haverford College
CoI: David Sand, Texas Tech University
CoI: Jay Strader, Michigan State University
CoI: Joo Heon Yoon, University of California Santa Barbra
CoI: Ross Fadely, New York University
CoI: Carl Grillmair, Caltech/IPAC

Title: Milky Way Stellar Streams: A Window to Purely Dark Subhalos

Abstract: Cold dark matter models predict that the Milky Way is surrounded by thousands of ``dark" subhalos that lack stars. These subhalos will interact with cold stellar streams in the halo, causing observable clumps and gaps in the streams. Using shallow data from the Sloan Digital Sky Survey, gaps have been identified in several streams, including the disrupting globular cluster Pal 5. Here we propose deep, wide-field, ugriz imaging with CTIO-4m/DECam of fields along the Pal 5 and Eastern Banded Structure streams. These data-when coupled with our numerical simulations-will allow a robust analysis and interpretation of the stream morphologies. Further, the images will serve as an essential precursor dataset for star/galaxy classification at faint magnitudes, perhaps the largest technical hurdle for near-field cosmology with DES and eventually LSST.


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NOAO >   Observing Info >   Approved Programs >   2014A-0339

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