4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Galaxy stacking strategies for MeerKAT

Presented by Dr. Ed ELSON on 8 Jul 2016 from 14:00 to 14:20
Type: Oral Presentation
Session: Astrophysics (1)
Track: Track D1 - Astrophysics


The LADUMA survey, to be carried out on MeerKAT, aims to indirectly detect neutral hydrogen line emission (HI) from galaxies at redshifts from 0.5 to unity, and beyond. To do this, galaxy HI spectra will need to be co-added in order to generate high S/N stacked spectra representative of the total HI content of distant samples. The stacking method is intrinsically susceptible to source confusion: a spectrum extracted for a particular galaxy will be contaminated by emission from other nearby galaxies. As such, stacked HI spectra usually over-estimate the total HI content of a sample. Traditionally, properly correcting for this has been difficult. We have developed the theoretical and computational machinery to produce synthetic, yet very realistic, HI line data cubes. We have started using them to quantify the confusion rates in generic HI stacking experiments. I will present some details of these simulations, and show how they are being used to optimise LADUMA observing and data analysis strategies.










Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room: 5A

Primary authors

  • Dr. Ed ELSON University of Cape Town + South African Astronomical Observatory