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  • 1811.12422v1

    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Pierandrea Guarnieri, Claudia Maraston, Daniel Thomas, Janine Pforr, Violeta Gonzalez-Perez, et al ; Candidate massive galaxies at z ∼ 4 in the Dark Energy Survey, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, 1 March 2019, Pages 3060–3081, https://doi.org/10.1093/mnras/sty3305 is available online at: https://academic.oup.com/mnras/article/483/3/3060/5232382

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Candidate Massive Galaxies at z~4 in the Dark Energy Survey

Research output: Contribution to journalJournal article

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  • Pierandrea Guarnieri
  • Claudia Maraston
  • Daniel Thomas
  • Janine Pforr
  • James Etherington
  • Joakim Carlsen
  • Xan Morice-Atkinson
  • Christopher J. Conselice
  • Julia Gschwend
  • Matias Carrasco Kind
  • Tim Abbott
  • Sahar Allam
  • David Brooks
  • David Burke
  • Aurelio Carnero Rosell
  • Jorge Carretero
  • Carlos Cunha
  • Chris ďAndrea
  • Luiz da Costa
  • Juan De Vincente
  • Darren DePoy
  • H. Thomas Diehl
  • Peter Doel
  • Josh Frieman
  • Juan Garcia-Bellido
  • Daniel Gruen
  • Gaston Gutierrez
  • Dominic Hanley
  • Devon Hollowood
  • Klaus Honscheid
  • David James
  • Tesla Jeltema
  • Kyler Kuehn
  • Marcos Lima
  • Marcio A. G. Maia
  • Jennifer Marshall
  • Paul Martini
  • Peter Melchior
  • Felipe Menanteau
  • Ramon Miquel
  • Andres Plazas Malagon
  • Samuel Richardson
  • Kathy Romer
  • Eusebio Sanchez
  • Vic Scarpine
  • Rafe Schindler
  • Ignacio Sevilla
  • Mathew Smith
  • Marcelle Soares-Santos
  • Flavia Sobreira
  • Eric Suchyta
  • Gregory Tarle
  • Alistair Walker
  • William Wester
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<mark>Journal publication date</mark>1/03/2019
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number3
Volume483
Number of pages22
Pages (from-to)3060-3081
Publication statusPublished
Early online date6/12/18
Original languageEnglish

Abstract

Using stellar population models, we predicted that the Dark Energy Survey (DES) - due to its special combination of area (5000 deg. sq.) and depth ($i = 24.3$) - would be in the position to detect massive ($\gtrsim 10^{11}$ M$_{\odot}$) galaxies at $z \sim 4$. We confront those theoretical calculations with the first $\sim 150$ deg. sq. of DES data reaching nominal depth. From a catalogue containing $\sim 5$ million sources, $\sim26000$ were found to have observed-frame $g-r$ vs $r-i$ colours within the locus predicted for $z \sim 4$ massive galaxies. We further removed contamination by stars and artefacts, obtaining 606 galaxies lining up by the model selection box. We obtained their photometric redshifts and physical properties by fitting model templates spanning a wide range of star formation histories, reddening and redshift. Key to constrain the models is the addition, to the optical DES bands $g$, $r$, $i$, $z$, and $Y$, of near-IR $J$, $H$, $K_{s}$ data from the Vista Hemisphere Survey. We further applied several quality cuts to the fitting results, including goodness of fit and a unimodal redshift probability distribution. We finally select 233 candidates whose photometric redshift probability distribution function peaks around $z\sim4$, have high stellar masses ($\log($M$^{*}$/M$_{\odot})\sim 11.7$ for a Salpeter IMF) and ages around 0.1 Gyr, i.e. formation redshift around 5. These properties match those of the progenitors of the most massive galaxies in the local universe. This is an ideal sample for spectroscopic follow-up to select the fraction of galaxies which is truly at high redshift. These initial results and those at the survey completion, which we shall push to higher redshifts, will set unprecedented constraints on galaxy formation, evolution, and the re-ionisation epoch.

Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Pierandrea Guarnieri, Claudia Maraston, Daniel Thomas, Janine Pforr, Violeta Gonzalez-Perez, et al ; Candidate massive galaxies at z ∼ 4 in the Dark Energy Survey, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, 1 March 2019, Pages 3060–3081, https://doi.org/10.1093/mnras/sty3305 is available online at: https://academic.oup.com/mnras/article/483/3/3060/5232382