Counts-excess from an atmospheric Cerenkov telescope in the general direction of the pulsar PSR 0355+54.

Details Counts-excess from an atmospheric Cerenkov telescope in the general direction of the pulsar PSR 0355+54. Counts-excess from an atmospheric Cerenkov telescope in the general direction of the pulsar PSR 0355+54.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..133s&link_type=abstract

Astronomy and Astrophysics, v.302, p.133

Astronomy and Astrophysics

Astrophysics

4

Pulsars: Individual: Psr 0355+54, Gamma Rays: Observations

Scientific paper

We present here results based on observations carried out from 1989 November 20-December-03, using one 3-mirror bank of the Gulmarg γ-ray telescope in the on-off mode. The on-source region, comprising a 4deg diameter angular-cell centered on α= 03 54 and δ=+55deg, included the direction of the pulsar PSR 0355+54, from which a significant pulsed signal, with a period of ~156.38ms, has been reported by the Pachmarhi group. While no pulsar-related periodic modulation is found in the 1989 Gulmarg data, there is a suggestion about the presence of ~4.1σ d.c. excess from the on-source region. Taken at its face value, this excess can be interpreted as a steady γ-ray signal with an integral flux of ~(4.5+/-0.8)x10^-11^ photons cm^-2^/s at energies beyond 4TeV. No other TeV γ-ray experiment, so far, has reported the detection of such a signal from this region. We propose here that this signal may possibly be due to a hitherto-unknown source lying in the overall on-source region.

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