4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

New Calibration Sources for Very Long Baseline Interferometry at 1.6 GHz

6 Jul 2016, 16:10
1h 50m
Kramer Law building

Kramer Law building

UCT Middle Campus Cape Town
Board: D1.280
Poster Presentation Track D1 - Astrophysics Poster Session (2)

Speaker

Mr Mekuanint Kifle Hailemariam (University of Pretoria & Hartebeesthoek Radio Astronomy Observatory)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

MSc.

Main supervisor (name and email)<br>and his / her institution

Prof. Roy Booth, rbooth@ska.ac.za, University of Pretoria

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

I present new 1.6 GHz VLBI observations of calibrator sources in the Southern Hemisphere. My sample contains 43 sources known to be good calibrators at 8.4 GHz. My
goals were firstly to establish the suitability of the selected sources as calibrators for 1.6 GHz VLBI observations, and secondly to determine, based on the selected sample, how the properties of the sources seen at 8.4 GHz are related to those seen at 1.6 GHz. I used seven telescopes; ASKAP, ATCA, Ceduna, Hobart, Mopra and Parkes from Australia, and HartRAO from South Africa.

By evaluating the sources’ radial extents, flux density at the central components of the sources and their brightness, I classified the sources into very good, good, intermediate
and bad calibrators. Among the 43 sources, I found that 38 sources fell into the good or very good calibrator classes. Of the basis of my sample therefore, I can say that 88 percent of the good calibrators at 8.4 GHz are also safe to use at 1.6 GHz.

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

No

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Primary author

Mr Mekuanint Kifle Hailemariam (University of Pretoria & Hartebeesthoek Radio Astronomy Observatory)

Co-authors

Dr Aletha de Witt (Hartebeesthoek Radio Astronomy Observatory) Dr Michael Bietenholz (Hartebeesthoek Radio Astronomy Observatory) Prof. Roy Booth (University of Pretoria)

Presentation Materials

Peer reviewing

Paper