The VANDELS ESO public spectroscopic survey : observations and first data release
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This paper describes the observations and the first data release (DR1) of the ESO public spectroscopic survey "VANDELS, a deep VIMOS survey of the CANDELS CDFS and UDS fields". The main targets of VANDELS are star-forming galaxies at redshift 2.4 < z < 5.5, an epoch when the Universe had not yet reached 20% of its current age, and massive passive galaxies in the range 1 < z < 2.5. By adopting a strategy of ultra-long exposure times, ranging from a minimum of 20 hours to a maximum of 80 hours per source, VANDELS is specifically designed to be the deepest-ever spectroscopic survey of the high-redshift Universe. Exploiting the red sensitivity of the refurbished VIMOS spectrograph, the survey is obtaining ultra-deep optical spectroscopy covering the wavelength range 4800-10000 Å with a sufficiently high signal-to-noise ratio to investigate the astrophysics of high-redshift galaxy evolution via detailed absorption line studies of well-defined samples of high-redshift galaxies. VANDELS-DR1 is the release of all medium-resolution spectroscopic data obtained during the first season of observations, on a 0.2 square degree area centered around the CANDELS-CDFS (Chandra deep-field south) and CANDELS-UDS (ultra-deep survey) areas. It includes data for all galaxies for which the total (or half of the total) scheduled integration time was completed. The DR1 contains 879 individual objects, approximately half in each of the two fields, that have a measured redshift, with the highest reliable redshifts reaching zspec ∼ 6. In DR1 we include fully wavelength-calibrated and flux-calibrated 1D spectra, the associated error spectrum and sky spectrum, and the associated wavelength-calibrated 2D spectra. We also provide a catalog with the essential galaxy parameters, including spectroscopic redshifts and redshift quality flags measured by the collaboration. We present the survey layout and observations, the data reduction and redshift measurement procedure, and the general properties of the VANDELS-DR1 sample. In particular, we discuss the spectroscopic redshift distribution and the accuracy of the photometric redshifts for each individual target category, and we provide some examples of data products for the various target types and the different quality flags. All VANDELS-DR1 data are publicly available and can be retrieved from the ESO archive. Two further data releases are foreseen in the next two years, and a final data release is currently scheduled for June 2020, which will include an improved rereduction of the entire spectroscopic data set.
Pentericci , L , McLure , R J , Garilli , B , Cucciati , O , Franzetti , P , Iovino , A , Amorin , R , Bolzonella , M , Bongiorno , A , Carnall , A C , Castellano , M , Cimatti , A , Cirasuolo , M , Cullen , F , De Barros , S , Dunlop , J S , Elbaz , D , Finkelstein , S , Fontana , A , Fontanot , F , Fumana , M , Gargiulo , A , Guaita , L , Hartley , W G , Jarvis , M , Juneau , S , Karman , W , Maccagni , D , Marchi , F , Marmol-Queralto , E , Nandra , K , Pompei , E , Pozzetti , L , Scodeggio , M , Sommariva , V , Talia , M , Almaini , O , Balestra , I , Bardelli , S , Bell , E F , Bourne , N , Bowler , R A A , Brusa , M , Buitrago , F , Caputi , C , Cassata , P , Charlot , S , Citro , A , Cresci , G , Cristiani , S , Curtis-Lake , E , Dickinson , M , Fazio , G , Ferguson , H C , Fiore , F , Franco , M , Fynbo , J P U , Galametz , A , Georgakakis , A , Giavalisco , M , Grazian , A , Hathi , N P , Jung , I , Kim , S , Koekemoer , A M , Khusanova , Y , Le Fèvre , O , Lotz , J , Mannucci , F , Maltby , D , Matsuoka , K , McLeod , D , Mendez-Hernandez , H , Mendez-Abreu , J , Mignoli , M , Moresco , M , Mortlock , A , Nonino , M , Pannella , M , Papovich , C , Popesso , P , Rosario , D J , Salvato , M , Santini , P , Schaerer , D , Schreiber , C , Stark , D , Tasca , L A M , Thomas , R , Treu , T , Vanzella , E , Wild , V , Williams , C , Zamorani , G & Zucca , E 2018 , ' The VANDELS ESO public spectroscopic survey : observations and first data release ' , Astronomy & Astrophysics , vol. 616 , A174 . https://doi.org/10.1051/0004-6361/201833047
Astronomy & Astrophysics
© ESO 2018. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1051/0004-6361/201833047
DescriptionRJM, AM, EMQ, and DJM acknowledge funding from the European Research Council via the award Consolidator Grant (P.I. R. McLure) AC acknowledges grant PRIN-MIUR 2015 and ASI n.I/023/12/0. PC acknowledges support from CONICYT through the project FONDECYT regular 1150216. RA acknowledges support by ERC Advanced Grant 695671 “QUENCH”. FB acknowledges support by Fundação para a Ciência e a Tecnologia (FCT) via the postdoctoral fellowship SFRH/BPD/103958/2014 and through research grant UID/FIS/04434/2013.
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