The e-MERLIN Galaxy Evolution Survey (e-MERGE): Overview and Survey Description
T. W. B. Muxlow, A. P. Thomson, J. F. Radcliffe, N. H. Wrigley, R. J. Beswick, Ian Smail, I. M. McHardy, S. T. Garrington, R. J. Ivison, M. J. Jarvis, I. Prando… 展开作者
T. W. B. Muxlow, A. P. Thomson, J. F. Radcliffe, 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, 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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21 pages, 12 colour figures, 3 tables -- accepted for publication in MNRAS
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 ($\sim 1.5μ$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.
High-resolution radio imaging of TGSSJ1530+1049, a radio galaxy in a dense environment at z=4
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences（孔科利天文台，HUN-REN地球科学与天文学研究中心）；ELTE Eötvös Loránd University（罗兰大学）；Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University（尼古拉·哥白尼大学物理、天文与信息学院天文研究所）；Joint Institute for VLBI ERIC（甚长基线干涉测量联合研究所）；Faculty of Aerospace Engineering, Delft University of Technology（代尔夫特理工大学航空航天工程学院）；Department of Physics, University of Oxford（牛津大学物理系）；Department of Physics and Astronomy, University College London（伦敦大学学院物理与天文系）
