Evolution of the dark matter phase-space density distributions of ΛCDM haloes
dc.contributor.author | Vass, Ileana M. | en_US |
dc.contributor.author | Valluri, Monica | en_US |
dc.contributor.author | Kravtsov, Andrey V. | en_US |
dc.contributor.author | Kazantzidis, Stelios | en_US |
dc.date.accessioned | 2010-06-01T21:07:20Z | |
dc.date.available | 2010-06-01T21:07:20Z | |
dc.date.issued | 2009-05-21 | en_US |
dc.identifier.citation | Vass, Ileana M.; Valluri, Monica; Kravtsov, Andrey V.; Kazantzidis, Stelios (2009). "Evolution of the dark matter phase-space density distributions of ΛCDM haloes." Monthly Notices of the Royal Astronomical Society 395(3): 1225-1236. <http://hdl.handle.net/2027.42/74207> | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.issn | 1365-2966 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/74207 | |
dc.description.abstract | We study the evolution of phase-space density during the hierarchical structure formation of Λ cold dark matter (CDM) haloes. We compute both a spherically averaged surrogate for phase-space density ( Q =Ρ/Σ 3 ) and the coarse-grained distribution function f ( x , v ) for dark matter (DM) particles that lie within ∼2 virial radii of four Milky Way sized dark matter haloes. The estimated f ( x , v ) spans over four decades at any radius. DM particles that end up within 2 virial radii of a Milky Way sized DM halo at z = 0 have an approximately Gaussian distribution in log ( f ) at early redshifts, but the distribution becomes increasingly skewed at lower redshifts. The value f peak corresponding to the peak of the Gaussian decreases as the evolution progresses and is well described by f peak ( z ) ∝ (1 + z ) 4.5 for z > 1 . The highest values of f (responsible for the skewness of the profile) are found at the centres of dark matter haloes and subhaloes, where f can be an order of magnitude higher than in the centre of the main halo. We confirm that Q ( r ) can be described by a power law with a slope of −1.8 ± 0.1 over 2.5 orders of magnitude in radius and over a wide range of redshifts. This Q ( r ) profile likely reflects the distribution of entropy ( K ≡Σ 2 /Ρ 2/3 DM ∝ r 1.2 ) , which dark matter acquires as it is accreted on to a growing halo. The estimated f ( x , v ) , on the other hand, exhibits a more complicated behaviour. Although the median coarse-grained phase-space density profile F ( r ) can be approximated by a power law, ∝ r −1.6±0.15 , in the inner regions of haloes (<0.6 r vir ) , at larger radii the profile flattens significantly. This is because phase-space density averaged on small scales is sensitive to the high- f material associated with surviving subhaloes, as well as relatively unmixed material (probably in streams) resulting from disrupted subhaloes, which contribute a sizable fraction of matter at large radii. | en_US |
dc.format.extent | 1876203 bytes | |
dc.format.extent | 3109 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.rights | Journal compilation © 2009 RAS | en_US |
dc.subject.other | Methods: N -Body Simulations | en_US |
dc.subject.other | Galaxies: Evolution | en_US |
dc.subject.other | Galaxies: Formation | en_US |
dc.subject.other | Galaxies: Kinematics and Dynamics | en_US |
dc.subject.other | Dark Matter | en_US |
dc.title | Evolution of the dark matter phase-space density distributions of ΛCDM haloes | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA | en_US |
dc.contributor.affiliationother | Department of Astronomy, University of Florida, Gainesville, FL 32611, USA | en_US |
dc.contributor.affiliationother | Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA | en_US |
dc.contributor.affiliationother | Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA | en_US |
dc.contributor.affiliationother | Department of Astronomy & Astrophysics, The University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60605 | en_US |
dc.contributor.affiliationother | Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/74207/1/j.1365-2966.2009.14614.x.pdf | |
dc.identifier.doi | 10.1111/j.1365-2966.2009.14614.x | en_US |
dc.identifier.source | Monthly Notices of the Royal Astronomical Society | en_US |
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