A maximum-likelihood method for improving faint source flux and color estimates

Details A maximum-likelihood method for improving faint source flux and color estimates A maximum-likelihood method for improving faint source flux and color estimates

1997-11-14

arxiv.org/abs/astro-ph/9711154v3

Publ.Astron.Soc.Pac. 110 (1998) 727

Astronomy and Astrophysics

Astrophysics

9 pp., accepted for publication in PASP

Scientific paper

10.1086/316173

Flux estimates for faint sources or transients are systematically biased high because there are far more truly faint sources than bright. Corrections which account for this effect are presented as a function of signal-to-noise ratio and the (true) slope of the faint-source number-flux relation. The corrections depend on the source being originally identified in the image in which it is being photometered. If a source has been identified in other data, the corrections are different; a prescription for calculating the corrections is presented. Implications of these corrections for analyses of surveys are discussed; the most important is that sources identified at signal-to-noise ratios of four or less are practically useless.

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