The Carnegie Hubble Program: Using Spitzer to Determine the Extragalactic Distance Scale

Details The Carnegie Hubble Program: Using Spitzer to Determine the Extragalactic Distance Scale The Carnegie Hubble Program: Using Spitzer to Determine the Extragalactic Distance Scale

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21420202f&link_type=abstract

American Astronomical Society, AAS Meeting #214, #202.02; Bulletin of the American Astronomical Society, Vol. 41, p.710

Astronomy and Astrophysics

Astronomy

Scientific paper

This program is using Spitzer to determine the Hubble constant to a systematic accuracy of 2-3%. By moving the entire distance scale ladder from the optical to the mid-infrared, it is possible to minimize all of the identified sources of systematic uncertainty known at the end of the HST Key Project on the extragalactic distance scale. Extinction effects, uncertain ground-to-space-based instrumental zero-point calibrations and the effects of metallicity variations on the colors and magnitudes of Cepheids limited the determination of the Hubble constant to ±10%. All of these systematic uncertainties are minimized in the mid-IR. This program will re-calibrate the extragalactic distance scale in the mid-infrared from the Milky Way, through nearby spiral galaxies containing Cepheids, to a mid-infrared calibration of the Tully-Fisher relation and Type Ia supernovae.

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