Speaker
Ms
Sumari Hattingh
(North-West University)
Description
A significant fraction of the baryons in galaxy groups and clusters is not locked up in stars and the interstellar medium (ISM), but exists in the form of extended multi-phase gas. The advantage of nearby galaxy groups is that this multi-phase gas can be studied via hot X-ray (≈Hα filaments) via optical emission line observations. Another advantage of groups is that the galaxies' heating process effects are more visible due to lower density and mass, containing few galaxies, as opposed to rich clusters. Interaction between the different phases is important for galaxy formation and evolution due to the fact that at least 50% of galaxies can be found in groups and clusters.
The Complete Local-Volume Groups Sample (CLoGS) is an optically selected sample of 53 groups within 80 Mpc of which the X-ray observations (Chandra / XMM-Newton) have already been done and can be used to infer important physical properties of galaxy groups, such as gas temperature and X-ray luminosity. In this project the Hα images, observed using the WIYN 0.9m telescope on Kitt Peak, are analysed with the aim to compare the Hα filaments to the X-ray emission images. Here we present preliminary results and a multi-wavelength comparison for two rich galaxy groups , where the central member is an X-ray bright radio galaxy with a powerful central jet, and , where the brightest member is an X-ray faint radio galaxy with only a weak radio point source.
Supervisor details<br><b>If not a student, type N/A.</b><br>Student abstract submision<br>requires supervisor permission:<br>please give their name,<br> institution and email address.
Prof. Ilani Loubser
North-West University
Ilani.Loubser@nwu.ac.za
| Please confirm that you<br>have carefully read the<br>abstract submission instructions<br>under the menu item<br>"Call for Abstracts"<br><b>(Yes / No)</b> | Yes |
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| Consideration for<br>student awards<br><b>Choose one option<br>from those below.</b><br>N/A<br>Hons<br>MSc<br>PhD | Hons |
Primary authors
Prof.
Arif Babul
(University of Victoria, Canada)
Dr
Ewan O'Sullivan
(Harvard-Smithsonian Centre for Astrophysics, USA)
Prof.
Ilani Loubser
(North-West University)
Ms
Sumari Hattingh
(North-West University)
