The extragalactic Cepheid distance bias: Numerical simulations

Details The extragalactic Cepheid distance bias: Numerical simulations The extragalactic Cepheid distance bias: Numerical simulations

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...413l..31p&link_type=abstract

Astronomy and Astrophysics, v.413, p.L31-L34 (2004)

Astronomy and Astrophysics

Astrophysics

6

Galaxies: General, Cosmology

Scientific paper

We present numerical simulations for a selection bias in the extragalactic Cepheid method (as detected in Teerikorpi & Paturel \cite{teerikorpi02}), which results in underestimated distances for host galaxies. The selection effect involves the Cepheid detection magnitude limits in V and I, the dispersion in < M(P) >, 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 łog H vs. Mlim 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.

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