@Article{TrevisanMamoStal:2017:‘oTeNF,
author = "Trevisan, Marina and Mamon, G. A. and Stalder Diaz, Diego Herbin",
affiliation = "{Institut d’Astrophysique de Paris} and {Institut d’Astrophysique
de Paris} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Group galaxy number density profiles far out: Is the ‘one-halo’
term NFW out to >10 virial radii?",
journal = "Monthly Notices of the Royal Astronomical Society",
year = "2017",
volume = "471",
number = "1",
pages = "L47--L51",
month = "Oct.",
keywords = "galaxies: clusters: general, galaxies: groups: general, galaxies:
haloes.",
abstract = "While the density profiles (DPs) of Lambda cold dark matter haloes
obey the Navarro, Frenk \& White (NFW) law out to roughly one
virial radius, r(vir), the structure of their outer parts is still
poorly understood, because the one-halo term describing the halo
itself is dominated by the two-halo term representing the other
haloes picked up. Using a semi-analytical model, we measure the
real-space one-halo number DP of groups out to 20r(vir) by
assigning each galaxy to its nearest group above mass M-a, in
units of the group r(vir). If M-a is small (large), the outer DP
of groups falls rapidly (slowly). We find that there is an optimal
M-a for which the stacked DP resembles the NFW model to 0.1 dex
accuracy out to 13 virial radii. We find similar long-range NFW
surface DPs (out to 10r(vir)) in the Sloan Digital Sky Survey
observations using a galaxy assignment scheme that combines the
non-linear virialized regions of groups with their linear outer
parts. The optimal M-a scales as the minimum mass of the groups
that are stacked to a power 0.25-0.3. The NFW model thus does not
solely originate from violent relaxation. Moreover, populating
haloes with galaxies using halo occupation distribution models
must proceed out to much larger radii than usually done.",
doi = "10.1093/mnrasl/slx092",
url = "http://dx.doi.org/10.1093/mnrasl/slx092",
issn = "0035-8711 and 1365-2966",
language = "en",
targetfile = "trevisan_group.pdf",
urlaccessdate = "25 nov. 2020"
}