9 papers
Comment on ''Exceptional points and double poles of the S matrix''
C. Dembowski, B. Dietz, H. -D. Graef +4
In a recent paper [Phys. Rev. E 67, 026204 (2003)], Rotter calculates the geometric phases that are picked up by the eigenvectors of a two-state quantum system when an exceptional…
Does Dark Matter at the Center and in the Halo of the Galaxy Consist of the Same Particles?
Neven Bilic, Faustin Munyaneza, Gary B. Tupper +1
After a discussion of the properties od degenerate fermion balls, we analize the orbits of the star S0-1, which has the smallest projected distance to Sgr A*, in the supermassive b…
Limits on Pulsar Parameters for Pulsed detections with H.E.S.S
O. C. de Jager, A. Konopelko, B. C. Raubenheimer +1
The non-detection of pulsed sub-TeV gamma-rays from EGRET pulsars proves that the EGRET pulsed spectra of all gamma-ray pulsars should terminate at energies below a few hundred GeV…
HI deficiency in the galaxy cluster ACO 3627. ATCA observations in the Great Attractor region
B. Vollmer, V. Cayatte, W. van Driel +5
ATCA 21 cm HI observations of the rich galaxy cluster ACO 3627 in the Great Attractor region are presented. Three fields of 30' diameter located within one Abell radius of ACO 3627…
Limits on magnetic field strength of the extended nebula of PSR B1706-44 from optical, X-ray and TeV observations
R. R. Sefako, O. C. de Jager, D. J. Van der Walt +1
The detection of unpulsed TeV emission from PSR B1706-44 raised the question if this VHE emission results from inverse Compton scattering of multi-TeV electrons on the CMBR and oth…
Evidence for a QPO structure in the TeV and X-ray light curve during the 1997 high state Gamma emission of Mkn 501
D. Kranich, O. C. De Jager, M. Kestel +2
The BL Lac Object Mkn 501 was in a state of high activity in the TeV range in 1997. During this time Mkn 501 was observed by all Cherenkov-Telescopes of the HEGRA-Collaboration. Pa…