A NOVEL APPROACH TO CONSTRAIN THE ESCAPE FRACTION AND DUST CONTENT AT HIGH REDSHIFT USING THE COSMIC INFRARED BACKGROUND FRACTIONAL ANISOTROPY

The Cosmic Infrared Background (CIB) provides an opportunity to constrain many properties of the high-redshift (z > 6) stellar population as a whole. This background, specifically from 1 to 200 mu m, should contain information about the era of reionization and the stars that are responsible for t...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2013-02, Vol.764 (1), p.1-7
Main Authors: Fernandez, Elizabeth R, Dole, Herve, Iliev, Ilian T
Format: Article
Language:English
Subjects:
ANISOTROPY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Bands
COSMOLOGY
Dust
DUSTS
Fluctuation
FLUCTUATIONS
GALAXIES
Infrared
Photons
RED SHIFT
STARS
Stellar populations
Wavelengths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The Cosmic Infrared Background (CIB) provides an opportunity to constrain many properties of the high-redshift (z > 6) stellar population as a whole. This background, specifically from 1 to 200 mu m, should contain information about the era of reionization and the stars that are responsible for these ionizing photons. In this paper, we look at the fractional anisotropy ( delta I/I) of this high-redshift population, where delta I is the ratio of the magnitude of the fluctuations and I is the mean intensity. We show that this can be used to constrain the escape fraction of the population as a whole, because the magnitude of the fluctuations of the CIB depends on the escape fraction, while the mean intensity does not. This results in lower values of the escape fraction producing higher values of the fractional anisotropy. This difference is predicted to be larger at longer wavelength bands (above 10 mu m), albeit it is also much harder to observe in that range. We show that the fractional anisotropy can also be used to separate a dusty from a dust-free population. Finally, we discuss the constraints provided by current observations on the CIB fractional anisotropy.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/764/1/56