An I-band calibration of the SBF method at blue colours(12)

An I-band calibration of the SBF method at blue colours

12S.Mieskeetal.:SBFcalibrationatbluecolours

asingleonewithsomeuniformscatter.We ndevidencethatthefaintergalaxiesinoursamplesexhibityoungerinte-gratedagesandhighermetallicitiesthanthebrightergalax-ies.

–FromapurelyempiricalSBFcalibration(relation

5)wede-ducea0.34±0.14magcosmicscatterof

MItobemoresensitivetodi erentage/metallicity

combinationsinbluecoloursthanatredcolours.

–ApplyingtheempiricalcalibrationtotheSBFmeasure-mentsofHydraandCentaurusclusterdEsfromMieske&Hilker(2003b)andMieskeetal.(2005)hasnoe ectontherelativeSBFdistanceofbothgalaxyclusters.Alsotheabsolutedistancesdonotrequirecorrection.

Acknowledgements.Wethanktheanonymousrefereeforhiscom-mentsandsuggestionswhichhelpedtoimprovethepaper.Weowethankstothesta atLasCampanasObservatoryfortheirassistanceincarryingouttheobservations.SMacknowledgessupportbyDFGprojectHI855/1andDAADPh.D.grantKennzi erD/01/35298.LIwassupportedbyFONDAP“CenterforAstrophysics”.

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