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ATLAS Probe: Breakthrough Science of Galaxy Evolution, Cosmology, Milky Way, and the Solar System

Wang, Yun and Dickinson, Mark and Hillenbrand, Lynne and Robberto, Massimo and Armus, Lee and Ballardini, Mario and Barkhouser, Robert and Bartlett, James and Behroozi, Peter and Benjamin, Robert A. and Brinchmann, Jarle and Chary, Ranga-Ram and Chuang, Chia-Hsun and Cimatti, Andrea and Conroy, Charlie and Content, Robert and Daddi, Emanuele and Donahue, Megan and Dore, Olivier and Eisenhardt, Peter and Ferguson, Henry C. and Faisst, Andreas and Fraser, Wesley C. and Glazebrook, Karl and Gorjian, Varoujan and Helou, George and Hirata, Christopher M. and Hudson, Michael and Kirkpatrick, J. Davy and Malhotra, Sangeeta and Mei, Simona and Moscardini, Lauro and Newman, Jeffrey A. and Ninkov, Zoran and Orsi, Alvaro and Ressler, Michael and Rhoads, James and Rhodes, Jason and Ryan, Russell and Samushia, Lado and Scarlata, Claudia and Scolnic, Daniel and Seiffert, Michael and Shapley, Alice and Smee, Stephen and Valentino, Francesco and Vorobiev, Dmitry and Wechsler, Risa H. (2019) ATLAS Probe: Breakthrough Science of Galaxy Evolution, Cosmology, Milky Way, and the Solar System. Astro2020 Science White Paper, . (Unpublished)

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ATLAS (Astrophysics Telescope for Large Area Spectroscopy) is a concept for a NASA probe-class space mission. It is the spectroscopic follow-up mission to WFIRST, boosting its scientific return by obtaining deep NIR & MIR slit spectroscopy for most of the galaxies imaged by the WFIRST High Latitude Survey at z>0.5. ATLAS will measure accurate and precise redshifts for ~200M galaxies out to z=7 and beyond, and deliver spectra that enable a wide range of diagnostic studies of the physical properties of galaxies over most of cosmic history. ATLAS and WFIRST together will produce a definitive 3D map of the Universe over 2000 sq deg. ATLAS Science Goals are: (1) Discover how galaxies have evolved in the cosmic web of dark matter from cosmic dawn through the peak era of galaxy assembly. (2) Discover the nature of cosmic acceleration. (3) Probe the Milky Way's dust-enshrouded regions, reaching the far side of our Galaxy. (4) Discover the bulk compositional building blocks of planetesimals formed in the outer Solar System. These flow down to the ATLAS Scientific Objectives: (1A) Trace the relation between galaxies and dark matter with less than 10% shot noise on relevant scales at 1<z<7. (1B) Probe the physics of galaxy evolution at 1<z<7. (2) Obtain definitive measurements of dark energy and tests of General Relativity. (3) Measure the 3D structure and stellar content of the inner Milky Way to a distance of 25 kpc. (4) Detect and quantify the composition of 3,000 planetesimals in the outer Solar System. ATLAS is a 1.5m telescope with a FoV of 0.4 sq deg, and uses Digital Micro-mirror Devices (DMDs) as slit selectors. It has a spectroscopic resolution of R = 1000, and a wavelength range of 1-4 microns. ATLAS has an unprecedented spectroscopic capability based on DMDs, with a spectroscopic multiplex factor ~6,000. ATLAS is designed to fit within the NASA probe-class space mission cost envelope.

Item Type:Report or Paper (White Paper)
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URLURL TypeDescription Paper ItemJournal Article
Armus, Lee0000-0003-3498-2973
Chary, Ranga-Ram0000-0001-7583-0621
Faisst, Andreas0000-0002-9382-9832
Helou, George0000-0003-3367-3415
Kirkpatrick, J. Davy0000-0003-4269-260X
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Series Name:Astro2020 Science White Paper
Record Number:CaltechAUTHORS:20190925-085020406
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98840
Deposited By: Tony Diaz
Deposited On:25 Sep 2019 17:47
Last Modified:19 Nov 2019 16:05

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