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Astronomy&Astrophysicsmanuscriptno.mieskeFebruary5,2008
cESO2008
AnI-bandcalibrationoftheSBFmethodatbluecolours
arXiv:astro-ph/0605660v1 26 May 2006
S.Mieske1,M.Hilker2,andL.Infante3
1
2
3
EuropeanSouthernObservatory,Karl-Schwarzschild-Strasse2,85748GarchingbeiM¨unchen,Germany
e-mail:smieske@eso.orgArgelanderInstitutf¨urAstronomie-AbteilungSternwarte,AufdemH¨ugel71,53121Bonn,Germanye-mail:mhilker@astro.uni-bonn.deDepartamentodeAstronom´ ayAstrof´ sica,Ponti ciaUniversidadCat´olicadeChile,Casilla306,Santiago22,Chilee-mail:linfante@astro.puc.cl
ABSTRACT
Context.Thesurfacebrightness uctuation(SBF)methodisapowerfultooltoderivedistancestogalaxiesforwhichsinglestarscannotberesolved.Uptonow,themethodhasbeencalibratedmainlyatredcoloursduetotheintrinsicfaintnessofblueearly-typegalaxies.Aims.InthispaperweaddresstheI-bandcalibrationoftheSBFmethodatbluecolours,theregimeofdwarfellipticalgalaxies(dEs).
Methods.Wepresentdeepandwide- eldVIphotometryofthecentralFornaxclusterobtainedatLasCampanasObservatory.WiththesedataweperformanSBFanalysisof25dEsintherange 16.5<MV< 11.2mag,0.8<(V I)0<1.10mag.Ourcolourcalibrationisaccuratetobetterthan2%.ForthecalibrationanalysisweexcludeeightdEswhoseSBFmeasurementwasa ectedbypoorseeing(FWHM 1′′).Results.OurSBFdataareinconsistentatthe3σlevelwithacolourindependentabsoluteSBFmagnitude
MI (V I)plane.Weobtainthefollowingone-branchempiricalSBFcalibration:
MI,whichissigni cantlylarger
thanfoundatreddercolours.ThisisinagreementwiththosetheoreticalSBFmodelsthatpredict
indicator.ThisnormalisedamplitudeconvertedtomagnitudeisintheframeworkofSBFinvestigationsreferredtoasappar-ent uctuationmagnitude
o printrequeststo:S.Mieske
in the present calibration of the SBF method. ...uctuation magnitudes and V–I colors carry only ...(red), SBF (blue), and Fundamental Plane (...
F.SBFSL % F.S % F.S % mVD.C mVD.C ≤... 20-125 grams Naming and selection methods: Ea ...calibration instrument * aerospace Product features ...
red end, and early-type dwarfs at the blue ...the SBF method using the integrated galaxy colors...lter with the ACS, i.e, calibration of the ...
the SBF method, they are relatively easier to ... to have an accurate V–I colour to input ...(2000) calibration of I–band SBF ?uctuations....
After a brief description of the SBF method we ... as the ?uctuation magnitude shows a colour ...uctuation magnitude calibration and the individual ...
color to be comparable to that for I-band SBF...The original Key Project calibration of the ...blue end of the color distribution than the M ...
RR Lyrae-Based Calibration of the Globular ...blue (metal-poor) Globular Clusters peak at the...Then, using the SBF absolute magnitudes provided ...
in the present calibration of the SBF method. ...uctuation magnitudes and V–I colors carry only ...(red), SBF (blue), and Fundamental Plane (...
We are also able to de?ne the wave-band at ...SBF calibrations (e.g. Tonry et al. 2001). ...ne the accuracy of the SBF method with the use...
the I-band, and the mean ‘?uctuation colour’ of the galaxies is V ...However, in order to obtain theoretical calibrations of the SBF distance ...
magnitudes and broad-band colors in order to investigate the calibration zero...The blue line is SBF I-band Mag = ?2.13 + 2.44 × [(V ? I) ...
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