Flux estimates for faint sources or transients are systematically biased high because there are far more truly faint sources than bright. Corrections that 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 4 or less are practically useless.
|Original language||English (US)|
|Number of pages||5|
|Journal||Publications of the Astronomical Society of the Pacific|
|State||Published - Jun 1998|
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science