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Title: ON THE SEPARATION BETWEEN BARYONIC AND DARK MATTER: EVIDENCE FOR PHANTOM DARK MATTER?

Abstract

The recent years have seen combined measurements of X-ray and (weak) lensing contours for colliding galaxy clusters such as, for instance, the famous 'Bullet' cluster. These observations have revealed offsets in the peaks of the baryonic and (dominant) gravitational matter component of order approx100-200 kpc. Such discrepancies are difficult to explain using modified theories for gravity other than dark matter. Or are they not? Here we use the concept of 'phantom dark matter' that is based upon a Newtonian interpretation of the modified Newtonian dynamics (MONDian) gravitational potential. We show that this idea is in fact capable of producing substantial offsets in idealistic density configurations, involving a uniform external field. However, when analyzed in a MONDian cosmological framework we deduce that the size (and probability) of the effect is too small to explain the observed offsets found in the most recent observations, at least in the simplest incarnation of phantom dark matter as discussed here. The lensing centers in merging galaxy clusters are likely very close to the centers of true mass even in a MONDian cosmology. This gives the support to the idea that neutrino-like non-collisional matter might be responsible for the observed offsets of lensing and X-ray peaks.

Authors:
 [1];  [2]; ;  [3]
  1. Departamento de Fisica Teorica, Modulo C-XI, Facultad de Ciencias, Universidad Autonoma de Madrid, 28049 Cantoblanco, Madrid (Spain)
  2. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Postdam (Germany)
  3. SUPA, University of St. Andrews, North Haugh, Fife, KY16 9SS (United Kingdom)
Publication Date:
OSTI Identifier:
21371823
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 703; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/703/2/2285; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COSMIC NEUTRINOS; COSMOLOGY; GALACTIC EVOLUTION; GALAXIES; GALAXY CLUSTERS; GRAVITATION; NONLUMINOUS MATTER; PHANTOMS; COSMIC RADIATION; ELEMENTARY PARTICLES; EVOLUTION; FERMIONS; HADRONS; IONIZING RADIATIONS; LEPTONS; MASSLESS PARTICLES; MATTER; MOCKUP; NEUTRINOS; RADIATIONS; STRUCTURAL MODELS

Citation Formats

Knebe, Alexander, Llinares, Claudio, Xufen, Wu, and Hongsheng, Zhao. ON THE SEPARATION BETWEEN BARYONIC AND DARK MATTER: EVIDENCE FOR PHANTOM DARK MATTER?. United States: N. p., 2009. Web. doi:10.1088/0004-637X/703/2/2285.
Knebe, Alexander, Llinares, Claudio, Xufen, Wu, & Hongsheng, Zhao. ON THE SEPARATION BETWEEN BARYONIC AND DARK MATTER: EVIDENCE FOR PHANTOM DARK MATTER?. United States. doi:10.1088/0004-637X/703/2/2285.
Knebe, Alexander, Llinares, Claudio, Xufen, Wu, and Hongsheng, Zhao. Thu . "ON THE SEPARATION BETWEEN BARYONIC AND DARK MATTER: EVIDENCE FOR PHANTOM DARK MATTER?". United States. doi:10.1088/0004-637X/703/2/2285.
@article{osti_21371823,
title = {ON THE SEPARATION BETWEEN BARYONIC AND DARK MATTER: EVIDENCE FOR PHANTOM DARK MATTER?},
author = {Knebe, Alexander and Llinares, Claudio and Xufen, Wu and Hongsheng, Zhao},
abstractNote = {The recent years have seen combined measurements of X-ray and (weak) lensing contours for colliding galaxy clusters such as, for instance, the famous 'Bullet' cluster. These observations have revealed offsets in the peaks of the baryonic and (dominant) gravitational matter component of order approx100-200 kpc. Such discrepancies are difficult to explain using modified theories for gravity other than dark matter. Or are they not? Here we use the concept of 'phantom dark matter' that is based upon a Newtonian interpretation of the modified Newtonian dynamics (MONDian) gravitational potential. We show that this idea is in fact capable of producing substantial offsets in idealistic density configurations, involving a uniform external field. However, when analyzed in a MONDian cosmological framework we deduce that the size (and probability) of the effect is too small to explain the observed offsets found in the most recent observations, at least in the simplest incarnation of phantom dark matter as discussed here. The lensing centers in merging galaxy clusters are likely very close to the centers of true mass even in a MONDian cosmology. This gives the support to the idea that neutrino-like non-collisional matter might be responsible for the observed offsets of lensing and X-ray peaks.},
doi = {10.1088/0004-637X/703/2/2285},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 703,
place = {United States},
year = {2009},
month = {10}
}