Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..322m&link_type=abstract
Nature (ISSN 0028-0836), vol. 338, March 23, 1989, p. 322-324. Research supported by NSF.
Astronomy and Astrophysics
Astronomy
6
Astronomical Photometry, Gamma Ray Astronomy, Gamma Ray Bursts, Neutron Stars, X Ray Sources, Accretion Disks, Color-Magnitude Diagram, Light Emission
Scientific paper
It is shown here that the optical emission from the optical counterpart to Geminga gamma-ray source could be due instead to a cold accretion disk with accretion rate of roughly 10 to the 11th g/s. This has promising implications for the search for the optical counterparts to gamma ray burst (GRB) sources whose basic physical parameters may resemble those of radio pulsars and related objects such as Geminga. It is argued that a similar search in the field of a GRB location should produce candidates similar to the Geminga optical counterpart if the gamma-ray burst distance is between 20 pc and 500 pc, as predicted by the disk-reprocessing model for the associated optical transients. This possibility is discussed in light of the fact that the first optical counterpart to a GRB source may already have been found, which may be used to test the accretion-disk model.
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