Volume 413, Number 3, January III 2004
|Page(s)||L31 - L34|
|Published online||07 January 2004|
Letter to the Editor
The extragalactic Cepheid distance bias: Numerical simulations
CRAL-Observatoire de Lyon, 69561 Saint-Genis Laval Cedex, France
2 Tuorla Observatory, University of Turku, 21500 Piikkiö, Finland
Corresponding author: G. Paturel, email@example.com
Accepted: 27 November 2003
We present numerical simulations for a selection bias in the extragalactic Cepheid method (as detected in Teerikorpi & Paturel [CITE]), which results in underestimated distances for host galaxies. The selection effect involves the Cepheid detection magnitude limits in V and I, the dispersion in , and importantly, variation amplitude, observable upper period limit, and also extinction. It influences both the bias curve fitting method and the method where short-period Cepheids are removed. When V, I, and P-limits exist, one expects a typical bias pattern in the vs. diagram. A full bias correction is possible only for special favourable situations, but there always appears a nearly unbiased plateau. The simulated bias varies from galaxy-to-galaxy roughly as was revealed by the strong and puzzling observed trend for galaxies in TP02.
Key words: galaxies: general / cosmology
© ESO, 2004
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