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Astrophysics Colloquium

Near-IR Background Fluctuation Results from the Cosmic Infrared Background Experiment
Presented by Mike Zemcov
California Institute of Technology

Thursday, June 11, 2015
4:00 P.M. in 169-336

The galaxies responsible for the reionization of the intergalactic medium at z > 6 produce fluctuations in the diffuse near-infrared background that can be detected by an instrument sufficiently sensitive to surface brightness fluctuations. The Cosmic Infrared Background Experiment (CIBER) was designed to make this measurement, and over the course of four sounding rocket flights has successfully measured the amplitude of the near-IR background fluctuations on arcminute scales. We detect an electromagnetic spectrum that is nearly Rayleigh-Jeans with an indication of a turn over at 1.1 microns, a spectrum that is significantly bluer than the integrated light from galaxies. These fluctuations have been interpreted as arising from intra-halo light from old, low mass stars residing in dwarf galaxies or dissociated from their parent galaxies during merging events over the history of the Universe. This population has implications for large scale structure formation, implying the existence of a previously undetected population that may account for an appreciable fraction of the missing baryons in the Universe.

JPL Contact: Olivier Dore (4-0690)

SVCP Astrophysics

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