The Infrared Glow of First Stars

Details The Infrared Glow of First Stars The Infrared Glow of First Stars

2005-12-15

arxiv.org/abs/astro-ph/0512403v2

Mon.Not.Roy.Astron.Soc.Lett.368:L6-L9,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, MNRAS in press

Scientific paper

10.1111/j.1745-3933.2006.00145.x

Kashlinsky et al. (2005) find a significant cosmic infrared background fluctuation excess on angular scales >50 arcsec that cannot be explained by instrumental noise or local foregrounds. The excess has been tentatively attributed to emission from primordial very massive (PopIII) stars formed <200 Myr after the Big Bang. Using an evolutionary model motivated by independent observations and including various feedback processes, we find that PopIII stars can contribute <40% of the total background intensity (\nu J_\nu ~ 1-2 nW m^-2 sr^-1 in the 0.8-8 \mum range) produced by all galaxies (hosting both PopIII and PopII stars) at z>5. The infrared fluctuation excess is instead very precisely accounted by the clustering signal of galaxies at z>5, predominantly hosting PopII stars with masses and properties similar to the present ones.

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