The lognormal properties of the soft gamma-ray repeater SGR 1806-20 and the VELA pulsar

Details The lognormal properties of the soft gamma-ray repeater SGR 1806-20 and the VELA pulsar The lognormal properties of the soft gamma-ray repeater SGR 1806-20 and the VELA pulsar

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288l..49h&link_type=abstract

Astronomy and Astrophysics 288L, L49-L52 (1994)

Astronomy and Astrophysics

Astrophysics

30

Gamma Rays: Bursts, Pulsars: Individual: Vela, Methods: Statistical

Scientific paper

The time intervals between the bursts from the soft gamma ray repeating source, SGR 1806-20, are consitent with a lognormal distribution. The intensity of the bursts is compatible with a truncated lognormal luminosity distribution but there is no correlation between the intensity and the time interval between bursts. The large range in the time intervals between the bursts from the other two known sources, SGR 1900+14 and SGR 0526-66, may be compatible with a lognormal distribution. The time intervals betwen the microjumps in the Vela pulsar and the size of the microjumps are compatible with lognormal distributions and there is no correlation between the time interval and the size of the microjump. The statistical properties of the bursts from SGR 1806-20 are very similar to the microjumps observed from the Vela pulsar and this association favours models of adjustments within a neutron star for the soft repeaters. There may be a large number of soft gamma ray repeating sources to be discovered with mean time intervals between bursts much longer than SGR 1806-20. New experiments are required to search for this population.

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