Mathematics – Probability
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1862c&link_type=abstract
American Astronomical Society, HEAD meeting #9, #18.62; Bulletin of the American Astronomical Society, Vol. 38, p.392
Mathematics
Probability
Scientific paper
Basic source parameters, such as position, positional accuracy, flux, spectral shape or hardness ratio, variability on various timescales, will be cross-correlated with a number of existing catalogues and deep multifrequency observations to survey individual gamma-ray sources for potential counterparts. Figure-of-merit estimates will be used to assess the likelihood of counterpart candidates. Positional coincidence and variability timescale will be the most obvious parameters on the figure-of-merit ranking. The LAT superior positional accuracy will substantially reduce the sources' error boxes, thus strengthening the positional coincidence criterion. However, additional information, possibly related to any given potential source class, will also play a role. Chance occurrence probability as well as energetic plausibility of an individual association will further constraint the FoM estimate. Positional coincidence with a pulsar with a rotational energy loss too low to sustain the source flux should lead to an unacceptably low value of the overall FoM. A variable high-latitude source, whose position is compatible with a known AGN, will be labelled as a putative AGN, while a steady source in the galactic plane, whose position is compatible with a young, energetic pulsar, will be scrutinized for the characteristic pulsar timing signature as the definitive proof of identification or for source extension reminiscent of a high-energy plerion.
If the cross correlation process does not yield a likely counterpart, or if the source has failed the acceptance tests devised for a given class of gamma-ray emitters, the source will be studied in-depth by the LAT Unidentified source WG, who will be responsible for the organization and efficient interpretation of results from a multiwavelength campaign aimed at finding (or discriminating between) potential counterpart candidates. The searches will be conducted mainly in nearby regions of the electromagnetic spectrum, i.e. in the VHE and soft to hard X-ray domains, characterized by more accurate source positioning.
Caraveo Patrizia A.
GLAST LAT Collaboration Science Group on Unidentified Sources
Reimer Olaf
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