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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2021

LOFAR properties of SILVERRUSH Ly α emitter candidates in the ELAIS-N1 field

A. Gloudemans
  • Fonction : Auteur
K. Duncan
  • Fonction : Auteur
R. Kondapally
J. Sabater
R. Cochrane
H. Röttgering
P. Best
  • Fonction : Auteur
M. Bonato
M. Bondi
K. Malek
  • Fonction : Auteur
I. Mccheyne
  • Fonction : Auteur
D. Smith
  • Fonction : Auteur
I. Prandoni
L. Wang
  • Fonction : Auteur

Résumé

Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of both early galaxy evolution and the process of reionization itself; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at z = 5.7 and z = 6.6, respectively, from the SILVERRUSH narrowband survey with deep Low Frequency Array (LOFAR) radio continuum observations in the European Large Area Infrared Space Observatory Survey-North 1 (ELAIS-N1) field to search for radio galaxies in the EoR and study the low-frequency radio properties of z ≳ 5.7 LAE emitters. Our LOFAR observations reach an unprecedented noise level of ~20 μ Jy beam −1 at 150 MHz, and we detect five candidate LAEs at >5 σ significance. Based on detailed spectral energy distribution modelling of independent multi-wavelength observations in the field, we conclude that these sources are likely [O II ] emitters at z = 1.47, yielding no reliable z ≳ 5.7 radio galaxy candidates. We examine the 111 z = 5.7 and z = 6.6 LAE candidates from our panchromatic photometry catalogue that are undetected by LOFAR, finding contamination rates of 81–92% for the z = 5.7 and z = 6.6 subset of the LAE candidate samples. This subset of the full sample is biased towards brighter magnitudes and redder near-infrared colours. The contamination rates of the full sample will therefore likely be lower than the reported values. Contamination of these optically bright LAE samples by likely [O II ] emitters is lowered significantly through constraints on the near-infrared colours, highlighting the need for infrared observations to robustly identify bright LAEs in narrowband surveys. Finally, the stacking of radio continuum observations for the robust LAE samples yields 2 σ upper limits on radio luminosity of 8.2 × 10 23 and 8.7 × 10 23 W Hz −1 at z = 5.7 and 6.6, respectively, corresponding to limits on their median star-formation rates of <53 and <56 M ⊙ yr −1 .
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Dates et versions

hal-03532983 , version 1 (02-08-2022)

Identifiants

Citer

A. Gloudemans, K. Duncan, R. Kondapally, J. Sabater, R. Cochrane, et al.. LOFAR properties of SILVERRUSH Ly α emitter candidates in the ELAIS-N1 field. Astronomy and Astrophysics - A&A, 2021, 648, pp.A7. ⟨10.1051/0004-6361/202038819⟩. ⟨hal-03532983⟩
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