How Real Detector Thresholds Create False Standard Candles

Details How Real Detector Thresholds Create False Standard Candles How Real Detector Thresholds Create False Standard Candles

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1133..425s&link_type=abstract

GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP Conference Proceedings, Volume 1133, pp. 425-427 (2009).

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Gamma-Ray Sources, Gamma-Ray Bursts, Radiation Detectors, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

GRB satellites are relatively inefficient detectors of dim hard bursts. For example, given two bursts of identical peak luminosity near the detection threshold, a dim soft burst will be preferentially detected over a dim hard burst. This means that a high Epeak burst will need a higher peak luminosity to be detected than a low Epeak GRB. This purely detector-created attribute will appear as a correlation between Epeak and luminosity, and should not be interpreted as a real standard candle effect. This result derives from Monte Carlo simulations utilizing a wide range of initial GRB spectra, and retriggering to create a final ``detected'' sample. In sum, Epeak is not a good standard candle, and its appearance as such in seeming correlations such as the Amati and other Liso vs. Epeak relations is likely a ghost of real energy-related detection thresholds.

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