Other
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10911b&link_type=abstract
HST Proposal ID #10911. Cycle 15
Other
Scientific paper
The surface brightness fluctuations SBF method has emerged as the primary distance indicator for mapping local large-scale structures Virgo, Fornax, as well as the velocity field out to nearly 15,000 km/s z < 0.05. This is because other precision distance indicators either lack the requisite depth Cepheids, TRGB or are too rare for adequate sampling supernovae, while more traditional methods Tully-Fisher, fundamental plane lack the necessary precision. The SBF method is now being used with great success in several major ACS Wide Field Camera programs. However, whereas the band of choice for the nearby structure studies has been F850LP, for the distant large-scale flow studies it is F814W because of its much greater throughput. As a result, the current calibration for the more distant studies is inadequate. We propose to establish the first systematic calibration of the SBF method in the important F814W ACS WFC bandpass. We will do this by measuring SBF in an optimized sample of galaxies in the nearby compact Fornax cluster. Given the large amount of effort and HST time being dedicated to F814W SBF measurements, it is imperative that we correct this outstanding calibration problem while time remains. For an extremely modest expenditure of orbits, we will remove a significant systematic error and vastly improve the overall accuracy of the ongoing ACS F814W SBF work. These data will also greatly enhance the legacy value of the HST archive for future SBF studies.
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