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The GALAH survey: The data reduction pipeline

Kos, J.; Lin, Jane; Zwitter, T.; Zerjal, M.; Sharma, Sanjib; Bland-Hawthorn, Joss; Asplund, Martin; Casey, A. R.; De Silva, Gayandhi; Freeman, Kenneth; Martell, Sarah; Simpson, Jeffrey D.; Schlesinger, Katharine; Zucker, Daniel; Anguiano, B.; Da Costa, Gary; Duong, Ly; Ireland, Michael; Nataf, David

Description

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,...[Show more]

dc.contributor.authorKos, J.
dc.contributor.authorLin, Jane
dc.contributor.authorZwitter, T.
dc.contributor.authorZerjal, M.
dc.contributor.authorSharma, Sanjib
dc.contributor.authorBland-Hawthorn, Joss
dc.contributor.authorAsplund, Martin
dc.contributor.authorCasey, A. R.
dc.contributor.authorDe Silva, Gayandhi
dc.contributor.authorFreeman, Kenneth
dc.contributor.authorMartell, Sarah
dc.contributor.authorSimpson, Jeffrey D.
dc.contributor.authorSchlesinger, Katharine
dc.contributor.authorZucker, Daniel
dc.contributor.authorAnguiano, B.
dc.contributor.authorDa Costa, Gary
dc.contributor.authorDuong, Ly
dc.contributor.authorIreland, Michael
dc.contributor.authorNataf, David
dc.date.accessioned2021-03-15T23:14:55Z
dc.date.available2021-03-15T23:14:55Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/227176
dc.description.abstractWe 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 (≲0.5 per cent) and scattered light (∼5 counts in a typical 20 min exposure), resolution across the field, sky spectrum properties, wavelength solution reliability (better than 1 km s−1 accuracy), and radial velocity precision
dc.description.sponsorshipJK is funded by ARC grant DP150104667 awarded to JBH and TB. This research has been supported in part by the Australian Research Council (ARC) funding schemes (grant numbers DP1095368, DP120101815, DP120101237, DP120104562, FS110200035 and FL110100012). SLM acknowledges the support of the ARC through grant DE140100598. DMN was supported by the ARC grant FL110100012.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights© 2016 The Authors
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectatmospheric effects
dc.subjectinstrumentation: spectrographs
dc.subjectmethods: observational
dc.subjecttechniques: spectroscopic
dc.subjectsurveys
dc.subjectstars: atmospheres
dc.titleThe GALAH survey: The data reduction pipeline
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume464
dcterms.dateAccepted2016-08-16
dc.date.issued2017
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationa383154xPUB6298
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationKos, J., University of Sydney
local.contributor.affiliationlin, jane, College of Science, ANU
local.contributor.affiliationZwitter, T., University of Ljubljana
local.contributor.affiliationZerjal, M., University of Ljubljana
local.contributor.affiliationSharma, Sanjib, The University of Sydney
local.contributor.affiliationBland-Hawthorn, Joss, University of Sydney
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationCasey , A. R., University of Cambridge
local.contributor.affiliationDe Silva, Gayandhi, Australian Astronomical Observatory
local.contributor.affiliationFreeman, Kenneth, College of Science, ANU
local.contributor.affiliationMartell, Sarah, University of New South Wales
local.contributor.affiliationSimpson, Jeffrey D., Australian Astronomical Observatory
local.contributor.affiliationSchlesinger, Katharine, College of Science, ANU
local.contributor.affiliationZucker, Daniel, Macquarie University
local.contributor.affiliationAnguiano, B., Macquarie University
local.contributor.affiliationDa Costa, Gary, College of Science, ANU
local.contributor.affiliationDuong, Ly, College of Science, ANU
local.contributor.affiliationIreland, Michael, College of Science, ANU
local.contributor.affiliationNataf, David, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/DP150104667
dc.relationhttp://purl.org/au-research/grants/arc/DP1095368
dc.relationhttp://purl.org/au-research/grants/arc/DP120101815
dc.relationhttp://purl.org/au-research/grants/arc/DP120101237
dc.relationhttp://purl.org/au-research/grants/arc/DP120104562
dc.relationhttp://purl.org/au-research/grants/arc/FS110200035
dc.relationhttp://purl.org/au-research/grants/arc/FL110100012
dc.relationhttp://purl.org/au-research/grants/arc/DE140100598
dc.relationhttp://purl.org/au-research/grants/arc/FL110100012
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1259
local.bibliographicCitation.lastpage1281
local.identifier.doi10.1093/mnras/stw2064
dc.date.updated2020-11-23T11:17:01Z
local.identifier.scopusID2-s2.0-85007187967
local.identifier.thomsonID000393647100001
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 16.3.21).
CollectionsANU Research Publications

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