文献类型  预印版论文

标  题    Reconciliation of the Surface Brightness Fluctuations and Type Ia Supernovae Distance Scales

著  者    Edward A. Ajhar; John L. Tonry; John P. Blakeslee

机  构    Kitt Peak National Observatory, National Optical Astronomy Observatories; Department of Physics, University of Miami; Institute for Astronomy, University of Hawaii; Department of Physics and Astronomy, Johns Hopkins University

主题词    galaxies: distances and redshifts; cosmology: distance scale; supernovae: general

系列号    NASA contract NAS5-26555

年        2011

地  域    Baltimore, MD

描  述    We present Hubble Space Telescope measurements of surface brightness fluctuations (SBF) distances to early-type galaxies that have hosted Type Ia supernovae (SNIa). The agreement in the relative SBF and SNIa multicolor light curve shape (MLCS) and delta-m15(dm15) distances is excellent. There is no systematic scale error with distance, and previous work has shown that SBF and SNIa give consistent ties to the Hubble flow. However, we confirm a systematic offset of ～ 0.25 mag in the distance zero ...Morepoints of the two methods, and we trace this offset to their respective Cepheid calibrations. SBF has in the past been calibrated with Cepheid distances from the H0Key Project team, while SNIa have been calibrated with Cepheid distances from the team composed of Sandage, Saha, and collaborators. When the two methods are calibrated in a consistent way, their distances are in superb agreement. Until the conflict over the"long"and"short"extragalactic Cepheid distances among many galaxies is resolved, we cannot definitively constrain the Hubble constant to better than ～ 10%, even leaving aside the additional uncertainty in the distance to the Large Magellanic Cloud, common to both Cepheid scales. However, recent theoretical SBF predictions from stellar population models favor the Key Project Cepheid scale, while the theoretical SNIa calibration lies between the long and short scales. In addition, while the current SBF distance to M31/M32 is in good agreement with the RR Lyrae and red giant branch distances, calibrating SBF with the longer Cepheid scale would introduce a 0.3 mag offset with respect to the RR Lyrae scale.points of the two methods, and we trace this offset to their respective Cepheid calibrations. SBF has in the past been calibrated with Cepheid distances from the H0Key Project team, while SNIa have been calibrated with Cepheid distances from the team composed of Sandage, Saha, and collaborators. When the two methods are calibrated in a consistent way, their distances are in superb agreement. Until the conflict over the"long"and"short"extragalactic Cepheid distances among many galaxies is resolved, we cannot definitively constrain the Hubble constant to better than ～ 10%, even leaving aside the additional uncertainty in the distance to the Large Magellanic Cloud, common to both Cepheid scales. However, recent theoretical SBF predictions from stellar population models favor the Key Project Cepheid scale, while the theoretical SNIa calibration lies between the long and short scales. In addition, while the current SBF distance to M31/M32 is in good agreement with the RR Lyrae and red giant branch distances, calibrating SBF with the longer Cepheid scale would introduce a 0.3 mag offset with respect to the RR Lyrae scale.

全文链接：http://218.246.35.11/fs/spm/20121102/PHYS11111503_40594611.PDF