NOAO >   Observing Info >   Approved Programs >   2020B-0288

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Program Information for 2020B-0288


PI: Alexie Leauthaud, UC Santa Cruz, alexie@ucsc.edu
Address: Astronomy Department, 1156 High St, Santa Cruz, CA 95064 USA

CoI: Jenny Greene, Princeton U.
CoI: Alyson Brooks, Rutgers U.
CoI: Annika Peter, OSU
CoI: Vivienne Baldassare, Washington State U.
CoI: Shany Danieli, Yale U.
CoI: James E Gunn, Princeton U.
CoI: Robert Lupton, Princeton U.
CoI: Yifei Luo, UC Santa Cruz
CoI: Erin Kado-Fong, Princeton U.
CoI: Song Huang, Princeton U.
CoI: Arka Banerjee, Stanford U.
CoI: Stacy Kim, Surrey Unversity
CoI: Sean Johnson, Princeton U.
CoI: Ben Johnston, Harvard U.
CoI: Amy Sardone, OSU
CoI: Justin Reed, University of Surrey
CoI: Zheng Cai, Tsingua

Title: The Merian Survey: Characterizing Dark Matter, Feedback, and Black Holes in Star-Forming Dwarf Galaxies

Abstract: Extensive studies of dwarf galaxies, in the Local Group and beyond, have revealed a considerable scatter in many of their fundamental properties. In particular, galaxies with stellar mass of ^8-10^9$ M$_$ present a diversity of star formation rates and rotation- curve shapes which are in tension with theoretical models. Reliably characterizing the dark matter distribution and baryonic processes in these galaxies, such as feedback, is key to in order to establish a complete picture of dark matter on small scales and to understand the threshold of galaxy formation. We propose to obtain the first robust data-set for a volume-limited census of dwarf galaxies in this mass range at $z=0.04-0.1$. Using two custom made filters, the Merian Survey will provide redshifts to a complete sample of 100,000 star forming dwarf galaxies (two orders of magnitude times larger than SDSS$+$GAMA) over an area of 867 deg$^2$. Combined with deep$+$high spatial resolution imaging from the Hyper-Suprime Camera, our program will result in the first high S/N weak lensing profile measurements for dwarf galaxies, probing their dark matter halos out to their virial radii. We will also use the Hyper-Suprime Camera imaging to get exquisite measurements of dwarf sizes and shapes. Finally, our unprecedented data- set will be directly compared to state-of-the-art, detailed, hydrodynamical simulations, to fully capture the interplay between dark matter, feedback, and their roles in the formation and evolution of dwarf galaxies.

Program Type: Survey

Scheduled Nights:
Run 1 (2021A):  CT-4m/DECam -- 6n on Mar 05 - Mar 11 2021, Mar 13 - Mar 17 2021
Run 1 (2021B):  CT-4m/DECam -- 15.5n on Sep 10 - Sep 13 2021, Nov 24 - Dec 04 2021, Dec 31 - Jan 01 2022, Jan 03 - Jan 04 2022, Jan 06 - Jan 07 2022, Jan 09 - Jan 11 2022, Jan 25 - Jan 31 2022


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 >   2020B-0288

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