Nowhere to Hide - Wide-field VLBI of the Hubble Deep Field-North

Jack F. Radcliffe, Michael A. Garrett, Thomas W B Muxlow, Robert J. Beswick, Peter D. Barthel



We present a new ultra-deep, wide-field VLBI survey targeting the central part of the Hubble Deep Field-North region using the European VLBI Network (EVN). The survey covers a large, 180 arcmin2, area to milliarcsecond resolutions and microJy sensitivities. Results are presented from the first of three epochs of observations, concentrating on a new calibration technique termed multi-source self-calibration (MSSC). MSSC uses the combined response of multiple faint sources to improve the phase stability of wide-field VLBI data sets. On average, MSSC improved the signal to noise of detected target sources by 27% in naturally weighted images and 63% in uniformly weighted images when compared to phase referenced calibration. We conclude with the first science results from this survey which concentrate on the redshift 2 sub-mm source, J123642+621331 (Waddington et al. 1999). Previous studies have indicated the presence of star-formation, together with a dusty, embedded AGN (Muxlow et al. 2005). This was confirmed by previous VLBI observations (Garrett et al. 2001, Chi et al. 2013), and makes the object a prime candidate to study the interplay between AGN and starburst activities at high redshifts. Combination imaging using the eMERGE (P.I. Muxlow) survey data (a combination of JVLA+VLA+MERLIN+eMERLIN) together with these new EVN data allows us to obtain radio images at a range of differing angular resolutions. This allows us to separate contributions from star-formation and embedded AGN.

Originele taal-2English
StatusPublished - 2015


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