Speaker
Description
One of the major priorities of international radio astronomy is to study the early universe through the detection of the 21 cm HI line from the Epoch of Reionisation (EoR). Due to the weak nature of the 21 cm signal, an important part in the detection of the EoR is removing contaminating foregrounds from our observations as they are multiple orders of magnitude brighter. One method to achieve this is through the generation of sky maps spanning a wide range of frequencies and angular scales to filter out these contaminants. Complementing the existing low-frequency sky maps, we have constructed a 159 MHz Southern Sky map with the Engineering Development Array (EDA2), one of the Square Kilometre Array (SKA) prototype systems using Murchison Widefield Array (MWA) dipoles. This is achieved through spherical harmonic transit interferometry, using ARTEmIS: the All-Sky Telescope m-mode Imaging Suite. Our results show that we can accurately map emissions on a multitude of angular scales and with temperature scales that are in agreement with other well-established low-frequency sky maps. Furthermore, we introduce multi-system spherical harmonic transit interferometry; where multiple arrays and their observations can be combined to form a complete radio continuum image, without the need for ad-hoc regression.
| Presentation length | 20-30 |
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