تقرير
The e-MERLIN Galaxy Evolution Survey (e-MERGE): Overview and Survey Description
| العنوان: | The e-MERLIN Galaxy Evolution Survey (e-MERGE): Overview and Survey Description |
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| المؤلفون: | Muxlow, T. W. B., Thomson, A. P., Radcliffe, J. F., Wrigley, N. H., Beswick, R. J., Smail, Ian, McHardy, I. M., Garrington, S. T., Ivison, R. J., Jarvis, M. J., Prandoni, I., Bondi, M., Guidetti, D., Argo, M. K., Bacon, David, Best, P. N., Biggs, A. D., Chapman, S. C., Coppin, K., Chen, H., Garratt, T. K., Garrett, M. A., Ibar, E., Kneib, Jean-Paul, Knudsen, Kirsten K., Koopmans, L. V. E., Morabito, L. K., Murphy, E. J., Njeri, A., Pearson, Chris, Perez-Torres, M. A., Richards, A. M. S., Rottgering, H. J. A., Sargent, M. T., Serjeant, Stephen, Simpson, C., Simpson, J. M., Swinbank, A. M., Varenius, E., Venturi, T. |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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. Comment: 21 pages, 12 colour figures, 3 tables -- accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/staa1279 |
| الوصول الحر: | http://arxiv.org/abs/2005.02407Test |
| رقم الانضمام: | edsarx.2005.02407 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/staa1279 |
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