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25 April 2024 |
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The GALAH survey: The data reduction pipeline | | Janez Kos
; Jane Lin
; Tomaž Zwitter
; Maruška Žerjal
; Sanjib Sharma
; Joss Bland-Hawthorn
; Martin Asplund
; Andrew R. Casey
; Gayandhi M. De Silva
; Ken C. Freeman
; Sarah L. Martell
; Jeffrey D. Simpson
; Katharine J. Schlesinger
; Daniel Zucker
; Borja Anguiano
; Carlos Bacigalupo
; Timothy R. Bedding
; Christopher Betters
; Gary Da Costa
; Ly Duong
; Elaina Hyde
; Michael Ireland
; Prajwal R. Kafle
; Sergio Leon-Saval
; Geraint F. Lewis
; Ulisse Munari
; David Nataf
; Dennis Stello
; Chris G. Tinney
; Gregor Traven
; Fred Watson
; Robert A. Wittenmyer
; | | Date: |
15 Aug 2016 | | Abstract: | We present the data reduction procedures being used by the 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
necessitates 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 ($lesssim0.5$%)
and scattered light ($sim5$ counts in a typical 20 minutes exposure),
resolution across the field, sky spectrum properties, wavelength solution
reliability (better than $1$ $mathrm{km s^{-1}}$ accuracy) and radial
velocity precision. | | Source: | arXiv, 1608.4391 | | Services: | Forum | Review | PDF | Favorites | |
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