<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'><span style="white-space:pre"> </span><span style="white-space:pre"> </span><span style="white-space:pre"> </span><span style="white-space:pre"> </span><span style="white-space:pre"> </span><span style="white-space:pre"> </span><span style="font-family: tahoma,new york,times,serif;">Public lecture</span><br><br><span style="font-family: tahoma,new york,times,serif;">Dr Ramotholo Sefako an astronomer at SA Astronomical Observatory (SAAO) will give a free public lecture about <strong>"Nonthermal Universe - a closer look at astronomical sources of very high energies"</strong>. The talk will be at SAAO in Cape Town on Saturday, May 12 at 20h00. There will be stargazing if the weather is good.</span><br style="font-family: tahoma,new york,times,serif;"><br style="font-family: tahoma,new york,times,serif;"><span style="font-weight: bold; font-family: tahoma,new york,times,serif;">Summary of the talk:</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Together, we will take a closer look at what we would see
if our eyes were to detect radiation in other wavelengths, like
X-rays and gamma-rays, which would mostly be nonthermal sources.
Optical and Infrared radiation are mostly dominated by thermal radiation
such as from our </span><span style="font-family: tahoma,new york,times,serif;" class="Object" id="OBJ_PREFIX_DWT944_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT945_com_zimbra_date">Sun</span></span><span style="font-family: tahoma,new york,times,serif;">
and many other stars we see every night. Nonthermal radiation, on the
other hand, is mainly as a result of acceleration of charged particles
in magnetic fields.</span><br style="font-family: tahoma,new york,times,serif;"><br style="font-family: tahoma,new york,times,serif;"><span style="font-weight: bold; font-family: tahoma,new york,times,serif;">Bio:</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Ramotholo Sefako obtained his PhD in astrophysics from North-West University (NWU) in Potchefstroom ten years ago. He became a Physics lecturer and a member of the Unit for Space Physics research group in 2002 at the same university. Subsequent to leaving NWU as a senior lecturer in 2004, he took up another lecturing position at University of the Free State, Qwa-Qwa campus. In 2005, he joined South African Astronomical Observatory as a post-doctoral fellow, and later a SALT astronomer. He is currently the head of Telescope Operations (TOPS) Division at SAAO. </span><br><br><div><span></span><span style="font-family: tahoma,new york,times,serif;">-- </span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Regards</span><br style="font-family: tahoma,new york,times,serif;"><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Thembela Mantungwa</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">S.A. Astronomical Observatory</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Tel: 021 460 9319</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Fax: 086 612 7502</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Email: tm@saao.ac.za</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;">Website: www.saao.ac.za / www.salt.ac.za</span><br style="font-family: tahoma,new york,times,serif;"><span style="font-family: tahoma,new york,times,serif;"></span><br></div><br></div></body></html>