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CMB as a possible new tool to study the dark baryons in galaxies


De Paolis, F; Ingrosso, G; Nucita, A A; Vetrugno, D; Gurzadyan, V G; Kashin, A L; Khachatryan, H G; Mirzoyan, S; Jetzer, P; Qadir, A (2012). CMB as a possible new tool to study the dark baryons in galaxies. Journal of Physics : Conference Series, 354(1):012004.

Abstract

Baryons constitute about 4% of our universe, but most of them are missing and we do not know where and in what form they are hidden. This constitute the so-called missing baryon problem. A possibility is that part of these baryons are hidden in galactic halos. We show how the 7-year data obtained by the WMAP satellite may be used to trace the halo of the nearby giant spiral galaxy M31. We detect a temperature asymmetry in the M31 halo along the rotation direction up to about 120 kpc. This could be the first detection of a galactic halo in microwaves and may open a new way to probe hidden baryons in these relatively less studied galactic objects using high accuracy CMB measurements.

Abstract

Baryons constitute about 4% of our universe, but most of them are missing and we do not know where and in what form they are hidden. This constitute the so-called missing baryon problem. A possibility is that part of these baryons are hidden in galactic halos. We show how the 7-year data obtained by the WMAP satellite may be used to trace the halo of the nearby giant spiral galaxy M31. We detect a temperature asymmetry in the M31 halo along the rotation direction up to about 120 kpc. This could be the first detection of a galactic halo in microwaves and may open a new way to probe hidden baryons in these relatively less studied galactic objects using high accuracy CMB measurements.

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Additional indexing

Item Type:Journal Article, not refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:March 2012
Deposited On:22 Jan 2013 07:35
Last Modified:05 Apr 2016 16:18
Publisher:IOP Publishing
ISSN:1742-6588
Publisher DOI:https://doi.org/10.1088/1742-6596/354/1/012004

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