The VANDELS ESO public spectroscopic survey: Observations and first data release

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. L., Fontana, A., Fontanot, F., Fumana, M., Gargiulo, A., Guaita, L., Hartley, W. G., Jarvis, M. J., 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, K. I., Dickinson, M., Kim, S., McLeod, D. J., Thomas, R. & Williams, C. C., 1-Sep-2018, In : Astronomy & astrophysics. 616, 15 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • L. Pentericci
  • R. J. McLure
  • B. Garilli
  • O. Cucciati
  • P. Franzetti
  • A. Iovino
  • R. Amorin
  • M. Bolzonella
  • A. Bongiorno
  • A. C. Carnall
  • M. Castellano
  • A. Cimatti
  • M. Cirasuolo
  • F. Cullen
  • S. De Barros
  • J. S. Dunlop
  • D. Elbaz
  • S. L. Finkelstein
  • A. Fontana
  • F. Fontanot
  • M. Fumana
  • A. Gargiulo
  • L. Guaita
  • W. G. Hartley
  • M. J. Jarvis
  • S. Juneau
  • W. Karman
  • D. Maccagni
  • F. Marchi
  • E. Marmol-Queralto
  • K. Nandra
  • E. Pompei
  • L. Pozzetti
  • M. Scodeggio
  • V. Sommariva
  • M. Talia
  • O. Almaini
  • I. Balestra
  • S. Bardelli
  • E. F. Bell
  • N. Bourne
  • R. A. A. Bowler
  • M. Brusa
  • F. Buitrago
  • K. I. Caputi
  • M. Dickinson
  • S. Kim
  • D. J. McLeod
  • R. Thomas
  • C. C. Williams
This paper describes the observations and the first data release (DR1)of the ESO public spectroscopic survey "VANDELS, a deep VIMOS survey ofthe CANDELS CDFS and UDS fields". The main targets of VANDELS arestar-forming galaxies at redshift 2.4 <z <5.5, an epoch when theUniverse had not yet reached 20% of its current age, and massive passivegalaxies in the range 1 <z <2.5. By adopting a strategy ofultra-long exposure times, ranging from a minimum of 20 h to a maximumof 80 h per source, VANDELS is specifically designed to be thedeepest-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 thewavelength range 4800-10 000 Å with a sufficiently highsignal-to-noise ratio to investigate the astrophysics of high-redshiftgalaxy evolution via detailed absorption line studies of well-definedsamples of high-redshift galaxies. VANDELS-DR1 is the release of allmedium-resolution spectroscopic data obtained during the first season ofobservations, on a 0.2 square degree area centered around theCANDELS-CDFS (Chandra deep-field south) and CANDELS-UDS (ultra-deepsurvey) areas. It includes data for all galaxies for which the total (orhalf of the total) scheduled integration time was completed. The DR1contains 879 individual objects, approximately half in each of the twofields, that have a measured redshift, with the highest reliableredshifts reaching zspec 6. In DR1 we include fullywavelength-calibrated and flux-calibrated 1D spectra, the associatederror spectrum and sky spectrum, and the associatedwavelength-calibrated 2D spectra. We also provide a catalog with theessential galaxy parameters, including spectroscopic redshifts andredshift quality flags measured by the collaboration. We present thesurvey layout and observations, the data reduction and redshiftmeasurement procedure, and the general properties of the VANDELS-DR1sample. In particular, we discuss the spectroscopic redshiftdistribution and the accuracy of the photometricredshifts for eachindividual target category, and we provide some examples of dataproducts for the various target typesand the different quality flags.All VANDELS-DR1 data are publicly available and can be retrieved fromthe ESO archive. Two further data releases are foreseen in the next twoyears, and a final data release is currently scheduled for June 2020,which will include an improved rereduction of the entire spectroscopicdata set.
Original languageEnglish
Number of pages15
JournalAstronomy & astrophysics
Publication statusPublished - 1-Sep-2018


  • surveys, galaxies: general, galaxies: evolution, galaxies: high-redshift, galaxies: fundamental parameters, REDSHIFT, VIMOS, GALAXIES

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