An I-band calibration of the SBF method at blue colours(10)

时间:2025-02-24

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

10S.Mieskeetal.:SBFcalibrationatblue

colours

Fig.7.ApparentVmagnitudeplottedvs.SBFdistancemodu-lusforthefourdi erentassumedcalibrationrelationsA)toD),asde nedinSect.2andTable2.Filledcirclesaregalaxieswithseeingbetterthan0.85′′.Theirmeandistanceandits1σerrorareindicatedbytheverticalsolidanddashedlines.Thegreenticksat(m M)=31.39magmarkthereferenceFornaxclusterdistancefromFreedmanetal.(2001)anditserror.Opencirclesaredatapointsforgalaxieswithseeingworsethan0.85′′.Theywerenotincludedincalculatingthemeandistanceandareonlyshownforthesakeof

completeness.

Fig.8.(V-I)0colourplottedvs.SBFdistancemodulusforfourdi erentassumedcalibrationrelations,seeFig.7.

Fig.9.ApparentSBFmagnitude

mIfainterthanthelineforcaseB),while

applyingthesolidandlongdashedlinetotheothergalaxies.

ThezeropointerrorincludesourstatisticalerrorsandtheerroroftheFornaxclusterreferencedistance.Thestatisticalerrorsofthezeropointandtheslopewerederivedfromthedisper-sionofthedatapointsaroundthelinearrelation,notfromthesinglemeasurementerrors(thiswouldhavedecreasedtheer-rorsby50%).TheformaldisagreementwiththeTonryslopeof4.5is1.1σ,whilethedisagreementwitha0slopeis1.3σ.Forthefullsampleofgalaxies,thezero-pointchangesto 2.31±0.15,andtheslopeto2.80±1.36.Notsurprisingly,thisagreeswiththe ndingfromthesemi-empiricalapproachthatcaseC)isrejectedathighersigni canceforthefullsample.

Toquantifytheintrinsicscatter–the“cosmicvariance”–oftheempirical“goodseeing”calibration,wesubtractinquadraturethemeansinglemeasurementuncertaintyin

MItobemoresensitivetodi erentage/metallicity

combinationsinthebluethaninthered(seeleftpanelofFig.1).NotethatthetwotheoreticalpredictionsbyLiuetal.andWortheyetal.intherightpanelofFig.1thatpredictacolourindependent

An I-band calibration of the SBF method at blue colours(10).doc 将本文的Word文档下载到电脑

精彩图片

热门精选

大家正在看

× 游客快捷下载通道(下载后可以自由复制和排版)

限时特价:7 元/份 原价:20元

支付方式:

开通VIP包月会员 特价:29元/月

注:下载文档有可能“只有目录或者内容不全”等情况,请下载之前注意辨别,如果您已付费且无法下载或内容有问题,请联系我们协助你处理。
微信:fanwen365 QQ:370150219