The Mass of Abell 1060 and AWM 7 from Spatially Resolved X-Ray Spectroscopy: Variations in Baryon Fraction | Zendy

Michael Loewenstein | Zendy; R. F. Mushotzky | Zendy

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The Mass of Abell 1060 and AWM 7 from Spatially Resolved X-Ray Spectroscopy: Variations in Baryon Fraction

Author(s) -

Michael Loewenstein,

R. F. Mushotzky

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310342

Subject(s) - physics , astrophysics , baryon , dark matter , intracluster medium , mass fraction , rosat , surface brightness , abell 2744 , baryonic dark matter , astronomy , galaxy cluster , galaxy groups and clusters , galaxy , cosmology , hot dark matter , dark energy , thermodynamics

Using X-ray temperature and surface brightness profiles of the hotintracluster medium derived from ASCA and ROSAT observations we placeconstraints on the dark matter and baryon fraction distributions in the poorclusters Abell 1060 and AWM 7. Although their total mass distributions aresimilar, AWM 7 has twice the baryon fraction of Abell 1060 in the best-fitmodels. The functional form of the dark matter distribution is ill-determined,however mass models where the baryon fractions in Abell 1060 and AWM 7significantly overlap are excluded. Such variations in baryon fraction are notpredicted by standard models and imply that some mechanism in addition togravity plays a major role in organizing matter on cluster scales.

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