Neutrinos as cluster dark matter

Abstract

The dynamical mass of clusters of galaxies, calculated in terms of modified Newtonian dynamics, is a factor of two or three times smaller than the Newtonian dynamical mass but remains significantly larger than the observed baryonic mass in the form of hot gas and stars in galaxies. Here I consider further the suggestion that the undetected matter might be in the form of cosmological neutrinos with mass on the order of 2 eV. If the neutrinos and baryons have comparable velocity dispersions and if the two components maintain their cosmological density ratio, then the electron density in the cores of clusters should be proportional to temperature to the 3/2 power, as appears to be true in non-cooling flow clusters. This is equivalent to the ``entropy floor'' proposed to explain the steepness of the observed luminosity-temperature relation, but here preheating of the medium is not required. Two fluid (neutrino-baryon) hydrostatic models of clusters, in the context of MOND, reproduce the observed luminosity-temperature relation of clusters. If the beta law is imposed the gas density distribution, then the self-consistent models predict the general form of the observed temperature profile in both cooling and non-cooling flow clusters.

9 pages, 6 figures, submitted to MNRAS

References in corpus (29)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Evidence for oscillation of atmospheric neutrinos
• A direct empirical proof of the existence of dark matter
• Relativistic gravitation theory for the MOND paradigm
• Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
• The Mass Function of an X-Ray Flux-Limited Sample of Galaxy Clusters
• Modified Newtonian Dynamics as an Alternative to Dark Matter
• Properties of the Intracluster Medium in an Ensemble of Nearby Galaxy Clusters
• The Imprint of Galaxy Formation on X-ray Clusters
• The Lx-T Relation and Intracluster Gas Fractions of X-ray Clusters
• Properties of galaxy dark matter halos from weak lensing
• Modified Newtonian Dynamics in the Milky Way
• Large Scale Structure in Bekenstein's theory of relativistic Modified Newtonian Dynamics
• The entropy and energy of intergalactic gas in galaxy clusters
• Temperature profiles of a representative sample of nearby X-ray galaxy clusters
• Clusters of galaxies with modified Newtonian dynamics (MOND)
• A New Measurement of the X-ray Temperature Function of Clusters of Galaxies
• On the Proof of Dark Matter, the Law of Gravity and the Mass of Neutrinos
• Resolving the virial discrepancy in clusters of galaxies with modified Newtonian dynamics
• Absolute Values of Neutrino Masses: Status and Prospects
• Temperature and entropy profiles of nearby cooling flow clusters observed with XMM-Newton
• Refining MOND interpolating function and TeVeS Lagrangian
• Confrontation of MOND Predictions with WMAP First Year Data
• The X-ray Size-Temperature Relation for Intermediate Redshift Galaxy Clusters
• MOND rotation curves of very low mass spiral galaxies
• A Note on the Statistical Mechanics of Violent Relaxation of Phase Space Elements of Different Densities
• Galaxy groups and the modified dynamics
• Mixed Dark Matter Model in Halos of Clusters
• An Interpretation of Flat Density Cores of Clusters of Galaxies by Degeneracy Pressure of Fermionic Dark Matter: A Case Study of Abell 1689

Cited by in corpus (40)

• A History of Dark Matter
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• A Tale of Two Paradigms: the Mutual Incommensurability of LCDM and MOND
• X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
• Are sterile neutrinos consistent with clusters, the CMB and MOND?
• The failures of the standard model of cosmology require a new paradigm
• Predictions and Outcomes for the Dynamics of Rotating Galaxies
• Rings and shells of "dark matter" as MOND artifacts
• The collision velocity of the bullet cluster in conventional and modified dynamics
• Equilibrium configurations of 11eV sterile neutrinos in MONDian galaxy clusters
• Forming Galaxies with MOND
• Can TeVeS avoid Dark Matter on galactic scales?
• The gravitational field of X-COP galaxy clusters
• The MOND Fundamental Plane
• Marriage à-la-MOND: Baryonic dark matter in galaxy clusters and the cooling flow puzzle
• Extended LCDM: generalized non-minimal coupling for dark matter fluids
• Do Newton's G and Milgrom's a_0 vary with cosmological epoch ?
• Reconciling MOND and dark matter?
• Weak Lensing of Galaxy Clusters in MOND
• The necessity of dark matter in MOND within galactic scales
• Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models
• The relation between stellar mass and weak lensing signal around galaxies: Implications for MOND
• Galaxy Cluster Bulk Flows and Collision Velocities in QUMOND
• An analytic model for non-spherical lenses in covariant MOdified Newtonian Dynamics
• The velocity distribution of SDSS satellites in MOND
• The velocity field in MOND cosmology
• Confronting MOND and TeVeS with strong gravitational lensing over galactic scales: an extended survey
• How Zwicky already ruled out modified gravity theories without dark matter
• Lopsidedness of cluster galaxies in modified gravity
• Tensor-vector-scalar-modified gravity: from small scale to cosmology
• Testing MOG, Non-Local Gravity and MOND with rotation curves of dwarf galaxies
• Neutrinos as galactic dark matter in the Ursa Major galaxy group?
• Substructure lensing in galaxy clusters as a constraint on low-mass sterile neutrinos in tensor-vector-scalar theory: The straight arc of Abell 2390
• Is Gravitational Lensing by Intercluster Filaments Always Negligible?
• Origin of the fundamental plane of elliptical galaxies in the Coma Cluster without fine-tuning
• The Impact of Assuming Flatness in the Determination of Neutrino Properties from Cosmological Data
• The Bosma effect revisited - I. HI and stellar disc scaling models
• Reconciliation of MOND and Dark Matter theory
• Scaling relations of the slightly self-interacting cold dark matter in galaxies and clusters
• Can MONDian vector theories explain the cosmic speed up ?