Monday, February 3, 2014
4:15 pm
Cahill, Hameetman Auditorium

Astronomy Tea Talk

A Measurement of the Kinetic Sunyaev-Zel'dovich Effect with Bolocam
Jack Sayers, Caltech
The kinetic Sunyaev-Zel'dovich (kSZ) effect describes the Doppler shift of CMB photons scattered off of high energy electrons in the intra-cluster medium (ICM) due to the bulk motion of the ICM. The surface brightness of the kSZ signal is independent of redshift and directly proportional to the line-of-sight peculiar velocity of the ICM. It therefore promises to be a powerful cosmological probe by providing absolute velocity measurements beyond the local universe, although detecting the kSZ signal has proven to be a significant observational challenge. I will present our recent measurement of the kSZ effect signal towards the massive galaxy cluster MACS J0717.5+3745 at z=0.55 using a combination of (sub)millimeter data from the Bolocam instrument at the Caltech Submillimeter Observatory and the Herschel-SPIRE photometer, along with X-ray data from Chandra and XMM. I will also discuss the potential science reach of future kSZ measurements from facilities like CCAT.
Contact Luca Ricci and Dan Perley and at 626-395-2460 and 626-395-3734
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