The GALAH survey: scientific motivation

De Silva, G. M. and Freeman, K. C. and Bland-Hawthorn, J. and Martell, S. and Wylie de Boer, E. and Asplund, M. and Keller, S. and Sharma, S. and Zucker, D. B. and Zwitter, T. and Anguiano, B. and Lewis, G. F. and Stello, D. and Bayliss, D. and Casagrande, L. and Da Costa, G. and Cannon, R. and Duong, L. and Ireland, M. J. and Lin, J. and Nataf, D. M. and Schlesinger, K. J. and Yong, D. and O'Toole, S. and Dotter, A. and Watson, F. and Bergemann, M. and Bacigalupo, C. and Carollo, D. and D'Orazi, V. and Parker, Q. and Reid, W. and Simpson, J. D. and Kos, J. and Traven, G. and Zerjal, M. and Beavis, M. A. and Sheinis, A. and Campbell, S. and Heger, A. and Lattanzio, J. and Casey, A. R. and Kafle, P. R. and Lind, K. and Wittenmyer, R. and Ting, Y. S. and Munari, U. (2015) The GALAH survey: scientific motivation. Monthly Notices of the Royal Astronomical Society, 449 (3). pp. 2604-2617. ISSN 0035-8711

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Abstract

The Galactic Archaeology with HERMES (GALAH) survey is a large high-resolution spectroscopic survey using the newly commissioned High Efficiency and Resolution Multi-Element Spectrograph (HERMES) on the Anglo-Australian Telescope. The HERMES spectrograph provides high-resolution (R ~ 28 000) spectra in four passbands for 392 stars simultaneously over a 2 deg field of view. The goal of the survey is to unravel the formation and evolutionary history of the Milky Way, using fossil remnants of ancient star formation events which have been disrupted and are now dispersed throughout the Galaxy. Chemical tagging seeks to identify such dispersed remnants solely from their common and unique chemical signatures; these groups are unidentifiable from their spatial, photometric or kinematic properties. To carry out chemical tagging, the GALAH survey will acquire spectra for a million stars down to V ~ 14. The HERMES spectra of FGK stars contain absorption lines from 29 elements including light proton-capture elements, α-elements, odd-Z elements, iron-peak elements and n-capture elements from the light and heavy s-process and the r-process. This paper describes the motivation and planned execution of the GALAH survey, and presents some results on the first-light performance of HERMES.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: No Faculty
Date Deposited: 24 May 2017 00:44
Last Modified: 02 Mar 2018 03:45
Uncontrolled Keywords: galaxy; stellar content;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stv327
URI: http://eprints.usq.edu.au/id/eprint/31766

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