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The e-MERLIN Galaxy Evolution Survey (e-MERGE): Overview and Survey Description

Research output: Contribution to journalArticle

  • T. W. B. Muxlow
  • A. P. Thomson
  • J. F. Radcliffe
  • N. H. Wrigley
  • R. J. Beswick
  • Ian Smail
  • I. M. McHardy
  • S. T. Garrington
  • M. J. Jarvis
  • I. Prandoni
  • M. Bondi
  • D. Guidetti
  • M. K. Argo
  • David Bacon
  • A. D. Biggs
  • S. C. Chapman
  • K. Coppin
  • H. Chen
  • T. K. Garratt
  • M. A. Garrett
  • E. Ibar
  • Jean-Paul Kneib
  • Kirsten K. Knudsen
  • L. V. E. Koopmans
  • L. K. Morabito
  • E. J. Murphy
  • A. Njeri
  • Chris Pearson
  • M. A. Perez-Torres
  • A. M. S. Richards
  • H. J. A. Rottgering
  • M. T. Sargent
  • Stephen Serjeant
  • C. Simpson
  • J. M. Simpson
  • A. M. Swinbank
  • E. Varenius
  • T. Venturi

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Original languageEnglish
Pages (from-to)1188-1208
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date8 May 2020
Publication statusPublished - 1 Jun 2020


We present an overview and description of the e-MERGE Survey (e-MERLIN Galaxy Evolution Survey) Data Release 1 (DR1), a large program of high-resolution 1.5-GHz radio observations of the GOODS-N field comprising ∼140 h of observations with enhanced-Multi-Element Remotely Linked Interferometer Network (e-MERLIN) and ∼40 h with the Very Large Array (VLA). We combine the long baselines of e-MERLIN (providing high angular resolution) with the relatively closely packed antennas of the VLA (providing excellent surface brightness sensitivity) to produce a deep 1.5-GHz radio survey with the sensitivity (⁠∼1.5μ Jy beam−1), angular resolution (0.2–0.7 arcsec) and field-of-view (∼15 × 15 arcmin2) to detect and spatially resolve star-forming galaxies and active galactic nucleus (AGN) at z ≳ 1. The goal of e-MERGE is to provide new constraints on the deep, sub-arcsecond radio sky which will be surveyed by SKA1-mid. In this initial publication, we discuss our data analysis techniques, including steps taken to model in-beam source variability over an ∼20-yr baseline and the development of new point spread function/primary beam models to seamlessly merge e-MERLIN and VLA data in the uv plane. We present early science results, including measurements of the luminosities and/or linear sizes of ∼500 galaxies selected at 1.5 GHz. In combination with deep Hubble Space Telescope observations, we measure a mean radio-to-optical size ratio of re-MERGE/rHST ∼ 1.02 ± 0.03, suggesting that in most high-redshift galaxies, the ∼GHz continuum emission traces the stellar light seen in optical imaging. This is the first in a series of papers that will explore the ∼kpc-scale radio properties of star-forming galaxies and AGN in the GOODS-N field observed by e-MERGE DR1.

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  • astro-ph.GA

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