A pr 1 99 8 TeV gamma rays from PSR 1706 - 44
نویسندگان
چکیده
Observations made with the University of Durham Mark 6 atmospheric Čerenkov telescope confirm that PSR B1706-44 is a very high energy γ-ray emitter. There is no indication from our dataset that the very high energy γ-rays are pulsed, in contrast to the findings at < 20 GeV, which indicate that more than 80% of the flux is pulsed. The flux at E > 300 GeV is estimated to be (3.9±0.7stat)×10 −11 cm s.
منابع مشابه
CANGAROO-III OBSERVATION OF TEV GAMMA RAYS FROM THE VICINITY OF PSR B1706−44 R. Enomoto J. Kushida T. Nakamori T. Kifune
Observation by the CANGAROO-III stereoscopic system of the Imaging Cherenkov Telescope has detected extended emission of TeV gamma rays in the vicinity of the pulsar PSR B1706−44. The strength of the signal observed as gamma-ray-like events varies when we apply different ways of emulating background events. The reason for such uncertainties is argued in relevance to gamma-rays embedded in the “...
متن کاملThe TeV gamma-ray emission mechanism of PSR 1706−44 based on the multi-wavelength spectrum
PSR 1706−44 has been observed at energies above several hundred GeV in 2000 and 2001 using the CANGAROO-II 10m telescope. Above 1TeV, the spectrum is a steep power-law, which is consistent with previous results. However, the spectral index seems to change around 1TeV and becomes much flatter at lower energies. In addition, we analyzed Chandra X-Ray Observatory (Chandra) archival data to derive ...
متن کاملRosat Observations of the Radio and Gamma-ray Pulsar Psr 1706-44 Rosat Observations of the Radio and Gamma-ray Pulsar Psr 1706-44
We report on the detection of PSR 1706-44 in two ROSAT-PSPC observations. The recorded source counts are unpulsed with a 2 pulsed fraction upper limit of 18%. Spectral analysis did not distinguish between black-body and power law models; however, we argue that the lack of pulsations and the similarity in the pulsar's spin parameters to those of the Vela pulsar favour a power law model dN=dE / E...
متن کاملar X iv : a st ro - p h / 99 04 40 5 v 1 2 9 A pr 1 99 9 Observations of TeV gamma rays from Markarian 501 at large zenith angles
TeV gamma rays from the blazar Markarian 501 have been detected with the University of Durham Mark 6 atmospherič Cerenkov telescope using the imaging technique at large zenith angles. Observations were made at zenith angles in the range 70 • − 73 • during 1997 July and August when Markarian 501 was undergoing a prolonged and strong flare.
متن کاملGamma-rays from the pulsar wind nebulae
We investigate the radiation processes inside supernova remnants which are powered by young pulsars. Using recent model for particle acceleration by the pulsar wind nebulae (PWNe), in which positrons gain energy in the process of resonant scattering by the heavy nuclei, we construct the time dependent radiation model for the PWNe. In this model, the spectra of relativistic particles, injected i...
متن کامل