Journal article
The GALAH survey: the data reduction pipeline
Monthly notices of the Royal Astronomical Society, Vol.464(2), pp.1259-1281
01/11/2017
DOI: 10.1093/mnras/stw2064
Abstract
We present the data reduction procedures being used by the GALactic Archeology with Hermes (GALAH) survey, carried out with the HERMES fibre-fed, multi-object spectrograph on the 3.9-m Anglo-Australian Telescope. GALAH is a unique survey, targeting 1 million stars brighter than magnitude V = 14 at a resolution of 28 000 with a goal to measure the abundances of 29 elements. Such a large number of high-resolution spectra necessitate the development of a reduction pipeline optimized for speed, accuracy, and consistency. We outline the design and structure of the IRAF-based reduction pipeline that we developed, specifically for GALAH, to produce fully calibrated spectra aimed for subsequent stellar atmospheric parameter estimation. The pipeline takes advantage of existing IRAF routines and other readily available software so as to be simple to maintain, testable, and reliable. A radial velocity and stellar atmospheric parameter estimator code is also presented, which is used for further data analysis and yields a useful verification of the reduction quality. We have used this estimator to quantify the data quality of GALAH for fibre cross-talk level (less than or similar to 0.5 per cent) and scattered light (similar to 5 counts in a typical 20 min exposure), resolution across the field, sky spectrum properties, wavelength solution reliability (better than 1 kms(-1) accuracy), and radial velocity precision.
Details
- Title: Subtitle
- The GALAH survey: the data reduction pipeline
- Creators
- Janez Kos - The University of SydneyJane Lin - Australian National UniversityTomaz Zwitter - University of LjubljanaMaruska Zerjal - University of LjubljanaSanjib Sharma - The University of SydneyJoss Bland-Hawthorn - The University of SydneyMartin Asplund - Australian National UniversityAndrew R. Casey - University of CambridgeGayandhi M. De Silva - The University of SydneyKen C. Freeman - Australian National UniversitySarah L. Martell - UNSW SydneyJeffrey D. Simpson - Australian Astronomical ObservatoryKatharine J. Schlesinger - Australian National UniversityDaniel Zucker - Macquarie UniversityBorja Anguiano - Macquarie UniversityCarlos Bacigalupo - Macquarie UniversityTimothy R. Bedding - Aarhus UniversityChristopher Betters - The University of SydneyGary Da Costa - Australian National UniversityLy Duong - Australian National UniversityElaina Hyde - Western Sydney UniversityMichael Ireland - Australian National UniversityPrajwal R. Kafle - International Centre for Radio Astronomy ResearchSergio Leon-Saval - The University of SydneyGeraint F. Lewis - The University of SydneyUlisse Munari - Osservatorio Astronomico di PadovaDavid Nataf - Australian National UniversityDennis Stello - Aarhus UniversityC. G. Tinney - UNSW SydneyGregor Traven - University of LjubljanaFred Watson - Australian Astronomical ObservatoryRobert A. Wittenmyer - UNSW Sydney
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.464(2), pp.1259-1281
- DOI
- 10.1093/mnras/stw2064
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Publisher
- Oxford Univ Press
- Number of pages
- 23
- Grant note
- FL110100012; DP1095368; DP120101815; DP120101237; DP120104562; FS110200035 / Australian Research Council (ARC); Australian Research Council DP150104667; DE140100598; FL110100012 / ARC; Australian Research Council
- Language
- English
- Date published
- 01/11/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701731202771
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