NOAO >   Observing Info >   Approved Programs >   2018A-0215

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Program Information for 2018A-0215


PI: Jeffrey Carlin, LSST, jcarlin@lsst.org
Address: 950 N. Cherry Ave., Tucson, AZ 85719 USA

CoI: Ricardo Munoz, Universidad de Chile
CoI: Gustavo E Medina, Universidad de Chile
CoI: Kathy Vivas, CTIO
CoI: Robyn Sanderson, California Institute of Technology
CoI: Beth Willman, LSST

Title: Mapping the Outer Halo of the Milky Way with RR Lyrae

Abstract: We request 2 nights of CTIO 4m/DECam time to search $sim36$~deg$^2$ of sky for RR Lyrae in the outer halo of the Milky Way, beyond $100$,kpc and out to distances $gtrsim250$,kpc. We will combine this with an additional request of 2 nights from the Chilean TAC (PI: Mu~noz) to map $sim70$~deg$^2$. Based on our discovery of the most distant known Galactic RR Lyrae (Medina et al. 2017b) with DECam time- series observations, we expect to find at least 10 distant RR Lyrae between 100-300 kpc, and possibly discover a dwarf galaxy, with a modest expenditure of telescope time. The resulting outer halo RR Lyrae are a vital probe of the recent accretion history of the Milky Way, and may ultimately yield strong constraints on the total mass of our Galaxy.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  CT-4m/DECam -- 2n on Apr 20 - Apr 21 2018


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2018A-0215

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