Alexander Kashlinsky (NASA Goddard Space Flight Center)

The near-IR cosmic background from first stars: from Spitzer to Euclid and JWST
When Nov 14, 2014 from 10:30 AM to 12:00 PM
What
  • Colloquium
Where SH, Lecture Hall
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I will review the current theoretical understanding of the first stars and black holes and their potential contributions to the Cosmic Infrared Background (CIB) during the emergence of the Universe out of the "Dark Ages". Intriguing indications of the possible emissions from these objects have been obtained over the last several years from CIB fluctuation measurements using Spitzer/IRAC deep images. The uncovered source-subtracted CIB fluctuations substantially exceed those from remaining known populations. The spatial spectrum of these fluctuations is consistent with populations clustering according to high-z LCDM model. The SED of the CIB fluctuations is blue and consistent with emissions produced by hot objects at high z. Cross-correlation analysis with Chandra X-ray data suggests that the unresolved CIB and CXB are coherent at a remarkably high level implying fractional abundance of black holes, among the emitters of the CIB, which significantly exceeds that in known populations. I will also discuss a new CIB project, LIBRAE (Looking at Infrared Background Radiation Anisotropies with Euclid), planned by NASA and ESA for the future Euclid satellite mission. I will review how LIBRAE will identify the net emissions from the first stars era, lead to a better understanding of the condition of intergalactic medium at that epoch in combination with the existing CMB data, and isolate the contributions from the first black holes in conjunction with X-ray data. A significant and unique further information can be provided with CIB measurements from JWST.