2009ApJ...691.1300J

Query : 2009ApJ...691.1300J

2009ApJ...691.1300J - Astrophys. J., 691, 1300-1306 (2009/February-1)

Halo density reduction by baryonic settling?

JARDEL J.R. and SELLWOOD J.A.

Abstract (from CDS):

We test the proposal by El-Zant et al. that the dark matter density of halos could be reduced through dynamical friction acting on heavy baryonic clumps in the early stages of galaxy formation. Using N-body simulations, we confirm that the inner halo density cusp is flattened to 0.2 of the halo break radius by the settling of a single clump of mass ≳0.5% of the halo mass. We also find that an ensemble of 50 clumps, each having masses ≳0.2%, can flatten the cusp to almost the halo break radius on a timescale of ∼9 Gyr, for a Navarro-Frenk-White profile halo of concentration 15. We summarize some of the difficulties that need to be overcome if this mechanism is to resolve the apparent conflict between the observed inner densities of galaxy halos and the predictions of ΛCDM.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: halos - galaxies: kinematics and dynamics

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ClG 2137-2353 ClG 21 40 12.8 -23 39 27     18.5     ~ 390 0

Query : 2009ApJ...691.1300J

Basic data :
ClG 2137-2353 -- Cluster of Galaxies
Other object types: otypes_help 		ClG (2008ApJ,ClG,...), X (1AXG,1E,...), gLe (2013MNRAS), C?G (XCLASS)
ICRS coord. (ep=J2000) : 		21 40 12.8 -23 39 27 [ ] E 2001ApJ...554L.129M
FK4 coord. (ep=B1950 eq=1950) : 		21 37 22.0 -23 53 05 [ ]
Gal coord. (ep=J2000) : 		026.4914 -46.9275 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 80102 [~] / z(spectroscopic) 0.3150 [~] / cz 94435 [~]
   (Opt) D 2021A&A...652A..12K
Angular size (arcmin): 		9.766666412 9.766666412 0 (Xray) E 2021A&A...652A..12K
Fluxes (1) :
V 18.5 [~] E ~
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 85 		: 27 Display criteria :

Identifiers (17) :
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ClG 2137-2353 ClG 2137.3-2353 MCXC J2140.2-2339 [JVH94] NGC 7099 12
ACT-CL J2140.2-2339 1E 2137.3-2353 PSZRX G026.51-46.94 EQ 2137-23
1AXG J214014-2339 2E 4505 RXC J2140.2-2339
BAX 325.0533-23.6574 2E 2137.3-2353 1RXS J214015.3-233946
ClG 2137-23 MCS J2140.2-2339 XCLASS 3337

References (390 between 1850 and 2026) (Total 390)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 4   

   

Observing logs
Herschel : 3    ISO : 1   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : ClG 2137-2353

Link by name to the catalogue in VizieR :

2E 4505 RXC J2140.2-2339 1RXS J214015.3-233946

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