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A maximum-likelihood method for improving faint source flux and color estimates | | David W. Hogg
; Edwin L. Turner
; | | Date: |
14 Nov 1997 | | Journal: | Publ.Astron.Soc.Pac. 110 (1998) 727 | | Subject: | astro-ph | | Affiliation: | Caltech, IAS), Edwin L. Turner (Princeton, IAS | | Abstract: | 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. | | Source: | arXiv, astro-ph/9711154 | | Services: | Forum | Review | PDF | Favorites | |
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