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Micro-Jy imaging at 150 MHz for the LOFAR EoR project
01/2014;
ABSTRACT
In its search for neutral hydrogen emission from the Epoch of
Reionization, LOFAR has by now accumulated more than 600 hours of radio
interferometric data, spread across three target windows: the north
celestial pole, 3C 196, and ELAIS-N1. During the past year we improved
our calibration and searched for -- and eliminated -- systematic effects
in our data and procedures. Although we have not yet detected the signal
we are looking for, we have produced by far the deepest and cleanest
maps ever made between 115 and 185 MHz. Our 6 arc-second resolution maps
reach noise levels between 25 and 80 micro-Jy per beam. We detect
thousands of radio sources per field, and find varying amounts of
diffuse Galactic polarization in all our target windows. We will present
the maps and discuss the most important issues we encountered in
producing them.
Reionization, LOFAR has by now accumulated more than 600 hours of radio
interferometric data, spread across three target windows: the north
celestial pole, 3C 196, and ELAIS-N1. During the past year we improved
our calibration and searched for -- and eliminated -- systematic effects
in our data and procedures. Although we have not yet detected the signal
we are looking for, we have produced by far the deepest and cleanest
maps ever made between 115 and 185 MHz. Our 6 arc-second resolution maps
reach noise levels between 25 and 80 micro-Jy per beam. We detect
thousands of radio sources per field, and find varying amounts of
diffuse Galactic polarization in all our target windows. We will present
the maps and discuss the most important issues we encountered in
producing them.
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