Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731104s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #311.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Carnegie Hubble Project is a Warm Spitzer Legacy mission, and has the aim of measuring H0 to an accuracy of 2%. The IRAC band Cepheid period--luminosity relations will be calibrated using Galactic and LMC samples, which were selected for their well--measured distances in the Galactic case, and to be free of crowding in the LMC case. The relations will then be used to obtain distances to a selection of galxies in our local group and beyond. The distance scale will be further extended using the Tully--Fisher relation to obtain distances to supernova--host galaxies and more distant galaxy clusters.
The first step in this process is to calibrate the Cepheid period--luminosity relation in the IRAC bands, using Galactic and LMC Cepheids. I will discuss the calibration of the relation in the LMC, and demonstrate how the excellent quality data that Spitzer has provided has enabled us to not only calibrate the PL relation, but to study the structure of the LMC itself.
Freedman Wendy
Madore Barry
Monson Andy
Persson Eric S.
Rigby Jane
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