A search in the COS-B data base for correlated time variability in regions containing objects of interest

Details A search in the COS-B data base for correlated time variability in regions containing objects of interest A search in the COS-B data base for correlated time variability in regions containing objects of interest

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..221c&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 221-224 (SEE N85-33902 22-93)

Physics

Gamma Rays, Photons, Pulsars, Variability, X Ray Sources, Data Bases, Radio Emission, Time Measurement

Scientific paper

As is well known, association of the gamma-ray sources with celestial objects is, in general, difficult on a pure positional basis, while correlated time variability could obviously provide such proof. This technique can be employed on regions of the gamma-ray sky containing interesting objects of known variability at some wavelength even in the absence of a recognized gamma-ray excess with the aim to extract a weak but predictable signal from the surrounding noise. This technique is applied here on a longer variability time scale, generally of the order of days. Photons coming from the sky regions centered on the various celestial objects considered were selected with energies 100 MeV and with arrival directions within an energy-dependent area of radius of approx 6 deg at 100 MeV. In order to construct a time profile of such photons, their arrival times were grouped in bins of dimensions defined by the available photons number and by the value of the period searched for.

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