University of Hertfordshire

From the same journal

From the same journal

By the same authors

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

Research output: Contribution to journalArticlepeer-review


  • 2005.02407v1

    Accepted author manuscript, 4.38 MB, PDF document

  • T. W. B. Muxlow
  • N. H. Wrigley
  • R. J. Beswick
  • Ian Smail
  • I. M. McHardy
  • S. T. Garrington
  • R. J. Ivison
  • M. J. Jarvis
  • I. Prandoni
  • M. Bondi
  • D. Guidetti
  • M. K. Argo
  • David Bacon
  • P. N. Best
  • A. D. Biggs
  • S. C. Chapman
  • H. Chen
  • T. K. Garratt
  • M. A. Garrett
  • E. Ibar
  • Jean-Paul Kneib
  • Kirsten K. Knudsen
  • L. V. E. Koopmans
  • L. K. Morabito
  • A. Njeri
  • Chris Pearson
  • M. A. Perez-Torres
  • H. J. A. Rottgering
  • M. T. Sargent
  • Stephen Serjeant
  • A. M. Swinbank
  • E. Varenius
  • T. Venturi
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Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 8 May 2020


We present an overview and description of the eMERLIN Galaxy Evolution survey (eMERGE) Data Release 1 (DR1), a large program of high-resolution 1.5 GHz radio observations of the GOODS-N field comprising $\sim140$ hours of observations with eMERLIN and $\sim40$ hours with the Very Large Array (VLA). We combine the long baselines of eMERLIN (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 ($\sim 1.5\mu$Jy beam$^{-1}$), angular resolution ($0.2"$--$0.7"$) and field-of-view ($\sim15' \times 15'$) to detect and spatially resolve star-forming galaxies and AGN at $z\gtrsim 1$. The goal of eMERGE 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 a $\sim20$ year baseline and the development of new point spread function/primary beam models to seamlessly merge eMERLIN and VLA data in the $uv$ plane. We present early science results, including measurements of the luminosities and/or linear sizes of $\sim500$ galaxes selected at 1.5 GHz. In combination with deep Hubble Space Telescope observations, we measure a mean radio-to-optical size ratio of $r_{\rm eMERGE}/r_{\rm HST}\sim1.02\pm0.03$, suggesting that in most high-redshift galaxies, the $\sim$GHz continuum emission traces the stellar light seen in optical imaging. This is the first in a series of papers which will explore the $\sim$kpc-scale radio properties of star-forming galaxies and AGN in the GOODS-N field observed by eMERGE DR1.


This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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