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

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.


Tutti gli autori

  • F. De Paolis , G. Ingrosso , A.A. Nucita , D. Vetrugno , V.G. Gurzadyan , A.L. Kashin , H.G. Khachatryan , S. Mirzoyan , Ph. Jetzer , A. Qadir

Titolo volume/Rivista

JOURNAL OF PHYSICS. CONFERENCE SERIES


Anno di pubblicazione

2012

ISSN

1742-6588

ISBN

Non Disponibile


Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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