Dust from reionization
2004 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 425, 9-14 p.Article in journal (Refereed) Published
The possibility that population III stars have reionized the Universe at redshifts greater than 6 has recently gained momentum with WMAP polarization results. Here we analyse the role of early dust produced by these stars and ejected into the intergalactic medium. We show that this dust, heated by the radiation from the same population III stars, produces a submillimetre excess. The electromagnetic spectrum of this excess could account for a significant fraction of the FIRAS (Far Infrared Absolute Spectrophotometer) cosmic far infrared background above 700 micron. This spectrum, a primary anisotropy (Delta T) spectrum times the nu2 dust emissivity law, peaking in the submillimetre domain around 750 micron, is generic and does not depend on other detailed dust properties. Arcminute-scale anisotropies, coming from inhomogeneities in this early dust, could be detected by future submillimetre experiments such as Planck HFI.
Place, publisher, year, edition, pages
2004. Vol. 425, 9-14 p.
Research subject Fysik
IdentifiersURN: urn:nbn:se:ltu:diva-2556DOI: 10.1051/0004-6361:20034448Local ID: 02ccc730-70c3-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-2556DiVA: diva2:975409
Validerad; 2004; 20061110 (ysko)2016-09-292016-09-29Bibliographically approved