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Author
dc.contributor.author
Prada, F 
Author
dc.contributor.author
Vitvitska, M 
Author
dc.contributor.author
Klypin, A 
Author
dc.contributor.author
Holtzman, J A 
Author
dc.contributor.author
Schlegel, D J 
Author
dc.contributor.author
Grebel, E K 
Author
dc.contributor.author
Rix, H W 
Author
dc.contributor.author
Brinkmann, J 
Author
dc.contributor.author
Mckay, T A 
Author
dc.contributor.author
Csabai, I 
Availability Date
dc.date.accessioned
2020-08-08T20:16:03Z
Availability Date
dc.date.available
2020-08-08T20:16:03Z
Release
dc.date.issued
2003
uri
dc.identifier.uri
http://hdl.handle.net/10831/49219
Abstract
dc.description.abstract
Using the Sloan Digital Sky Survey (SDSS), we probe the halo mass distribution by studying the velocities of satellites orbiting isolated galaxies. In a subsample that covers 2500 deg(2) on the sky, we detect about 3000 satellites with absolute blue magnitudes going down to M-B = - 14; most of the satellites have M-B = - 16 to - 18, comparable to the magnitudes of M32 and the Magellanic Clouds. After a careful, model-independent removal of interlopers, we find that the line-of-sight velocity dispersion of satellites declines with distance to the primary. For an L-* galaxy the rms line-of-sight velocity changes from approximate to 120 km s(-1) at 20 kpc to approximate to 60 km s(-1) at 350 kpc. This decline agrees remarkably well with theoretical expectations, as all modern cosmological models predict that the density of dark matter in the peripheral parts of galaxies declines as rho(DM) proportional to r(-3). Thus, for the first time we find direct observational evidence of the density decline predicted by cosmological models; we also note that this result contradicts alternative theories of gravity such as modified Newtonian dynamics (MOND). We also find that the velocity dispersion of satellites within 100 kpc scales with the absolute magnitude of the central galaxy as sigma proportional to L-0.3; this is very close to the Tully-Fisher relation for normal spiral galaxies.
Language
dc.language
Angol
Title
dc.title
Observing the dark matter density profile of isolated galaxies
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-06-05T11:49:59Z
Scope
dc.format.page
260-271
Doi ID
dc.identifier.doi
10.1086/378669
Wos ID
dc.identifier.wos
000186688700020
ID Scopus
dc.identifier.scopus
0346266069
MTMT ID
dc.identifier.mtmt
1064343
Issue Number
dc.identifier.issue
1
abbreviated journal
dc.identifier.jabbrev
ASTROPHYS J
Journal
dc.identifier.jtitle
ASTROPHYSICAL JOURNAL
Volume Number
dc.identifier.volume
598
Release Date
dc.description.issuedate
2003
department of Author
dc.contributor.institution
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék


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Observing the dark matter density profile of isolated galaxies
 

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