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: 
             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"