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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2020

The e-MERGE Survey (e-MERLIN Galaxy Evolution Survey): overview and survey description

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

Abstract

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 ( ${\sim}1.5\, \mu$ 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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Dates and versions

insu-03667093 , version 1 (13-05-2022)

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T. W. B. Muxlow, A. P. Thomson, J. F. Radcliffe, N. H. Wrigley, R. J. Beswick, et al.. The e-MERGE Survey (e-MERLIN Galaxy Evolution Survey): overview and survey description. Monthly Notices of the Royal Astronomical Society, 2020, 495, pp.1188-1208. ⟨10.1093/mnras/staa1279⟩. ⟨insu-03667093⟩
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