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Browsing Research Output by Title

Now showing items 770-789 of 3071

Discovery of extended VHE Y-ray emission from the vacinity of the young massive stellar cluster Westerlund 1

Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Sheidaei, F.; Venter, Christo; Büsching, Ingo; De Jager, Ocker Cornelis; Vorster, M (EDP Science, 2012)

Aims. Results obtained in very-high-energy (VHE; E≥100GeV) γ-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in the vicinity of the young massive stellar ...
Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with H.E.S.S

Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Pekeur, Nicolette Whilna; Sheidaei, F.; Tavernet, J. P.; Venter, Christo; Vorster, Michael Johannes; De Jager, Ocker Cornelis (2012)

We present the significant detection of the first extragalactic pulsar wind nebula (PWN) detected in gamma rays, N 157B, located in the large Magellanic Cloud (LMC). Pulsars with high spin-down luminosity are found to power ...
Discovery of Gamma-Ray Emission from the Shell-Type Supernova Remnant RCW 86 with HESS

Raubenheimer, Barend; Venter, Christo; Busching, I; Holleran, Mathew; De Jager, Ocker (IOP Publishing Limited, 2009)
Discovery of hard-spectrum y-ray emission from the BL Lacertae object 1ES0414+009

Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Sheidaei, F.; Venter, Christo; Vorster, Michael Johannes; Büsching, Ingo; De Jager, Ocker Cornelis (EDP Science, 2012)

Context. 1ES 0414 + 009 (z = 0.287) is a distant high-frequency-peaked BL Lac object, and has long been considered a likely emitter of very-high-energy (VHE, E > 100 GeV) γ-rays due to its high X-ray and radio flux. Aims. ...
Discovery of pulsed y-rays from psr j0034-0534 with the fermi large area telescope: A case for co-located radio and y-ray emission regions

Abdo, A A; Ackermann, M; Baldini, L; Bloom, E D; Porter, T A; Claus, R; Venter, Christo; Johannesson, G; Pelassa, V; Smith, D A (Institution of Physics (IOP), 2010)
Discovery of pulsed γ-rays from PSR J0034–0534 with the Fermi large area telescope: a case for co-located radio and γ-ray emission regions

Abdo, A.A.; Ackermann, M.; Ajello, M.; Allafort, A.; Venter, C. (IOP Publishing, 2010)

Millisecond pulsars (MSPs) have been firmly established as a class of γ-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using 13 months of LAT data, ...
Discovery of the source HESS J1356-645 associated with the young and energetic PSR J1357-6429

Venter, Christo; Vorster, Michael Johannes; Büsching, Ingo; De Jager, Ocker Cornelis (EDP Sciences, 2011)

Context. Several newly discovered very-high-energy (VHE; E > 100 GeV) γ-ray sources in the Galaxy are thought to be associated with energetic pulsars. Among them, middle-aged (≳104 yr) systems exhibit large centre-filled ...
Discovery of two millisecond pulsars in fermi sources with the nancay radio telescope

Venter, Christo (IOP Publishing, 2011)

We report the discovery of two millisecond pulsars in a search for radio pulsations at the positions of Fermi-Large Area Telescope sources with no previously known counterparts, using the Nan¸cay Radio Telescope. The two ...
Discovery of two millisecond pulsars in fermi sources with the nançay radio telescope

Cognard, I.; Guillemot, L.; Johnson, T.J.; Smith, D.A.; Venter, C. (IOP Publishing, 2011)

We report the discovery of two millisecond pulsars in a search for radio pulsations at the positions of Fermi-Large Area Telescope sources with no previously known counterparts, using the Nan¸cay Radio Telescope. The two ...
Discovery of very high enegy gamma-ray emission coincident with molecular clouds in the W 28 (G6.4-0.1) field

Aharonian, F; Raubenheimer, Barend; Venter, Christo; Holleran, Mathew; Büsching, I; De Jager, Ocker (EDP sciences, 2008)
Discovery of very high energy gamma ray emission from the vicinity of PSR J1913+1011 with HESS

Aharonian, F; Venter, Christo; Holleran, Mathew; Büsching, I; Raubenheimer, Barend (EDP sciences, 2008)
Discovery of Very High Energy y-Ray Emission from Centaurus A with HESS

Aharonian, F; Venter, Christo; Busching, I; Holleran, Mathew; De Jager, Ocker; Raubenheimer, Barend (IOP Publishing Limited, 2009)
Discovery of VHE emission towards the carina arm region with the HESS telescope array: HESS J1018-589

Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Casanova, S.; Pekeur, Nicolette Whilna; Sheidaei, F.; Venter, Christo; Vorster, Michael Johannes; Büsching, Ingo; De Jager, Ocker Cornelis (EDP Science, 2012)

The Carina arm region, containing the supernova remnant SNR G284.3–1.8, the high-energy (HE; E > 100 MeV) binary 1FGL J1018.6–5856 and the energetic pulsar PSR J1016–5857 and its nebula, has been observed with the H.E.S.S. ...
Discovery of VHE gamma-rays from the high-frequency-peaked BL Lacertae object RGB

Aharonian, F; Raubenheimer, Barend; Venter, Christo; Holleran, Mathew; Büsching, I; De Jager, Ocker (EDP sciences, 2008)
Discovery of VHE Y-ray emission and multi-wavelength observations of the BL Lacertae object 1rx J101015.9-311909*bject 1rx J101015.9–311909*

Abramowski, A.; Acero, F.; Aharonian, F.; Akhperjanian, A. G.; Cologna, G.; Hauser, M.; Kaufmann, S.; Mohamed, M.; Quirrenbach, A.; Schwemmer, S.; Lenain, J-P.; Wagner, S.J. (EDP Science, 2012)

1RXS J101015.9 − 311909 is a galaxy located at a redshift of z = 0.14 hosting an active nucleus (called AGN) belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV) and very high (VHE, E > ...
Discovery of VHE y-rays from the BL Larcertae object PKS 0548-322

Aharonian, F; Schwarzburg, S; Van Eldik, C; Förster, A; Venter, Christo; Vivier, M; Völk, H J; Busching, Ingo; Hermann, G; Hoffmann, A (EDP Sciences, 2010)
Discrepancies between perceptions of English proficiency and scores on English tests: implications for teaching English in South Africa

Coetzee-Van Rooy, A.S. ((SAALT/SAVTO) South African Association of Language Teaching / Suid-Afrikaanse Vereniging vir Taalonderrig // Sabinet, 2011)
Disinfection by-products and extractable organic compounds in South African tap water

Van Zyl, Pieter; Pienaar, J J (Kobus); Nothnagel, Carien; Kotte, Karstens; Beukes, J P (Vaal Triangle Faculty of Northwest University, 2008)

An important step in urban purification of drinking water is disinfection by e.g. chlorination where potential pathogenic micro-organisms in the water supply are killed. The presence of organic material in natural water ...
Disordered eating and menstrual patterns in female university netball players

Pieterse, Karen; Wright, Hester Helena; Havemann-Nel, Lize; De Lange, Zelda (Health & Medical Publishing Group, 2011)

Objectives: The primary aim of this study was to investigate disordered eating (DE) behavior and menstrual patterns in provincial-to-national level student netball players. The secondary aim was to examine the associations ...
Dissociation between learning and memory impairment and other sickness behaviours during simulated Mycoplasma infection in rats

Harvey, Brian Herbert; Mitchell, Duncan; Swanepoel, Tanya; Harden, Lois M.; Laburn, Helen P. (Elsevier, 2011)

To investigate potential consequences for learning and memory, we have simulated the effects of Mycoplasma infection, in rats, by administering fibroblast-stimulating lipopepide-1 (FSL-1), a pyrogenic moiety of Mycoplasma ...