2016ApJS..223....2V


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:14:22

2016ApJS..223....2V - Astrophys. J., Suppl. Ser., 223, 2-2 (2016/March-0)

LOFAR facet calibration.

VAN WEEREN R.J., WILLIAMS W.L., HARDCASTLE M.J., SHIMWELL T.W., RAFFERTY D.A., SABATER J., HEALD G., SRIDHAR S.S., DIJKEMA T.J., BRUNETTI G., BRUGGEN M., ANDRADE-SANTOS F., OGREAN G.A., ROTTGERING H.J.A., DAWSON W.A., FORMAN W.R., DE GASPERIN F., JONES C., MILEY G.K., RUDNICK L., SARAZIN C.L., BONAFEDE A., BEST P.N., BIRZAN L., CASSANO R., CHYZY K.T., CROSTON J.H., ENSSLIN T., FERRARI C., HOEFT M., HORELLOU C., JARVIS M.J., KRAFT R.P., MEVIUS M., INTEMA H.T., MURRAY S.S., ORRU E., PIZZO R., SIMIONESCU A., STROE A., VAN DER TOL S. and WHITE G.J.

Abstract (from CDS):

LOFAR, the Low-Frequency Array, is a powerful new radio telescope operating between 10 and 240 MHz. LOFAR allows detailed sensitive high-resolution studies of the low-frequency radio sky. At the same time LOFAR also provides excellent short baseline coverage to map diffuse extended emission. However, producing high-quality deep images is challenging due to the presence of direction-dependent calibration errors, caused by imperfect knowledge of the station beam shapes and the ionosphere. Furthermore, the large data volume and presence of station clock errors present additional difficulties. In this paper we present a new calibration scheme, which we name facet calibration, to obtain deep high-resolution LOFAR High Band Antenna images using the Dutch part of the array. This scheme solves and corrects the direction-dependent errors in a number of facets that cover the observed field of view. Facet calibration provides close to thermal noise limited images for a typical 8 hr observing run at ∼5^′′ resolution, meeting the specifications of the LOFAR Tier-1 northern survey.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): techniques: interferometric

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1280 1
2 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 69 0
3 2C 524 Sy2 06 09 32.701768 +48 04 17.04207   21.198 18.00 18.767   ~ 171 1
4 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2130 2
5 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2441 1

    Equat.    Gal    SGal    Ecl

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2020.10.31-12:14:22

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