The Mid-Infrared Tully-Fisher Relation: Calibration of the SNIa Scale and Ho

Understand

This paper builds on a calibration of the SNIa absolute distance scale begun with a core of distances based on the correlation between galaxy rotation rates and optical Ic band photometry.

• This new work extends the calibration through the use of mid-infrared photometry acquired at 3.6 microns with Spitzer Space Telescope.
• The great virtue of the satellite observations is constancy of the photometry at a level better than 1% across the sky.
• The new calibration is based on 39 individual galaxies and 8 clusters that have been the sites of well observed SNIa.