The GALAH survey: scientific motivation
Date Issued
2015
Author(s)
De Silva, G. M.
•
Freeman, K. C.
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Bland-Hawthorn, J.
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Martell, S.
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de Boer, E. Wylie
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Asplund, M.
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Keller, S.
•
Sharma, S.
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Zucker, D. B.
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Zwitter, T.
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Anguiano, B.
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Bacigalupo, C.
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Bayliss, D.
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Beavis, M. A.
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Bergemann, M.
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Campbell, S.
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Cannon, R.
•
•
Casagrande, L.
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Casey, A. R.
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Da Costa, G.
•
•
Dotter, A.
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Duong, L.
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Heger, A.
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Ireland, M. J.
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Kafle, P. R.
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Kos, J.
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Lattanzio, J.
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Lewis, G. F.
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Lin, J.
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Lind, K.
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•
Nataf, D. M.
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O'Toole, S.
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Parker, Q.
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Reid, W.
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Schlesinger, K. J.
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Sheinis, A.
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Simpson, J. D.
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Stello, D.
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Ting, Y. -S.
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Traven, G.
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Watson, F.
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Wittenmyer, R.
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Yong, D.
•
Žerjal, M.
Description
This research has been supported in part by the Australian Research Council (ARC) funding schemes (grant numbers DP1095368, DP120101815, DP120101237, DP120104562, FS110200035 and FL110100012). AH was supported by an ARC Future Fellowship grant FT120100363. DMN was supported by the ARC grant FL110100012. SLM was supported by the ARC DECRA grant DE140100598. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
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.
Volume
449
Issue
3
Start page
2604
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.449.2604D
Rights
open.access
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