Image of Alice in Wonderland at the Mad Hatter's tea party You are cordially invited to afternoon tea and biscuits wine and chocolate

Astronomy Tea Talks at Caltech

Mondays, Hameetman auditorium (Cahill)
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2011 - 2012 season:
13 Febuary 2012 Vicky Scowcroft (Carnegie Observatories)

The Carnegie Hubble Program

The Carnegie Hubble Program is a Warm Spitzer program which aims to measure the Hubble constant to a systematic accuracy of 2%. We use a parallax calibration of the Cepheid PL relation in the Milky Way, combined with the slope of the PL relation in the LMC to fix the base of our distance ladder. We will then extend our Cepheid distance scale out through the local group and beyond, where we will continue with the Tully-Fisher relation, ending with IRAC observations of supernova host galaxies. In this talk I will discuss our work on the LMC Cepheid population in the IRAC 3.6 and 4.5 micron bands. I will talk about our measurement of the period-luminosity and period-color relations in the LMC and Milky Way, and our distance to the LMC. Finally, I will report on our progress in measuring the Hubble Constant, and discuss the remaining challenges in our project.
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Last modified on 07th Feb 2012 by Marco Viero.  

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