Présidents de session
Contributed Talks 3: 21cm LIM, Analysis and Modeling
- Albert Stebbins (Fermilab)
- Pip Petersen (University of Washington)
- Khandakar Md Asif Elahi (Indian Institute of Technology Madras)
The Murchison Widefield Array (MWA) is an excellent radio-interferometer for 21-cm line intensity mapping from the epoch of reionization (EoR). A major challenge in MWA data analysis is the periodic pattern of flagged channels in the visibility data, which leads to severe foreground contamination in the EoR window. We have developed a novel technique to mitigate this challenge, and realistic...
Radio Recombination Lines (RRLs) are spectral lines produced through the transition between high principal quantum numbers (n > 150 in the context of this work). While RRL emission is individually weak at a single redshift (or over a narrow redshift band), intensity mapping integrates emission over broad redshift ranges, allowing weak signals to compound. Additionally, multiple distinct RRLs...
A well known problem in astronomical spectroscopy of confused sources comes from achromaticity (the wavelength dependence) of the spatial beams of the spectrograph. This achromaticity aliases spatial structure into spectral structure. One cannot completely separate spatial from spectral because of achromaticity. It is shown that if one has multiple overlapping beams one can synthesize beams...
