Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale?

Details Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale? Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale?

1999-12-16

arxiv.org/abs/astro-ph/9912333v1

Astronomy and Astrophysics

Astrophysics

14 pages, 2 figures, 1 table, LaTeX, accepted for publication in Astrophysical Journal Letters, also available at http://cas

Scientific paper

10.1086/312477

We examine the suggestion that half of the HST Key Project- and Sandage/Saha-observed galaxies have had their distances systematically underestimated, by 0.1-0.3 mag in the distance modulus, due to the underappreciated influence of stellar profile blending on the WFC chips. The signature of such an effect would be a systematic trend in (i) the Type Ia supernovae corrected peak luminosity and (ii) the Tully-Fisher residuals, with increasing calibrator distance, and (iii) a differential offset between PC and WFC distance moduli, within the same galaxy. The absence of a trend would be expected if blending were negligible (as has been inherently assumed in the analyses of the aforementioned teams). We adopt a functional form for the predicted influence of blending that is consistent with the models of Mochejska et al. and Stanek & Udalski, and demonstrate that the expected correlation with distance predicted by these studies is not supported by the data. We conclude that the Cepheid-based extragalactic distance scale has not been severely compromised by the neglect of blending.

Affiliated with

Also associated with

No associations

Rating

Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Has Blending Compromised Cepheid-Based Determinations of the Extragalactic Distance Scale? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-579958