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Modeling the Very Small Scale Clustering of Luminous Red Galaxies
We model the small-scale clustering of luminous red galaxies (LRGs) in the Sloan Digital Sky Survey. Specifically, we use the halo occupation distribution formalism to model the projected two-point correlation function of LRGs on scales well within the sizes of their host halos (0.016 h {sup -1} Mpc
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Published in: | The Astrophysical journal 2010-01, Vol.709 (1), p.115-134 |
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creator | Watson, Douglas F Berlind, Andreas A McBride, Cameron K Masjedi, Morad |
description | We model the small-scale clustering of luminous red galaxies (LRGs) in the Sloan Digital Sky Survey. Specifically, we use the halo occupation distribution formalism to model the projected two-point correlation function of LRGs on scales well within the sizes of their host halos (0.016 h {sup -1} Mpc |
doi_str_mv | 10.1088/0004-637X/709/1/115 |
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Specifically, we use the halo occupation distribution formalism to model the projected two-point correlation function of LRGs on scales well within the sizes of their host halos (0.016 h {sup -1} Mpc <= r <= 0.42 h {sup -1} Mpc). We start by varying P(N|M), the probability distribution that a dark matter halo of mass M contains N LRGs, and assuming that the radial distribution of satellite LRGs within halos traces the Navarro-Frenk-White (NFW) dark matter density profile. We find that varying P(N|M) alone is not sufficient to match the small-scale data. We next allow the concentration of satellite LRG galaxies to differ from that of dark matter and find that this is also not sufficient. Finally, we relax the assumption of an NFW profile and allow the inner slope of the density profile to vary. We find that this model provides a good fit to the data and the resulting value of the slope is -2.17 +- 0.12. 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Specifically, we use the halo occupation distribution formalism to model the projected two-point correlation function of LRGs on scales well within the sizes of their host halos (0.016 h {sup -1} Mpc <= r <= 0.42 h {sup -1} Mpc). We start by varying P(N|M), the probability distribution that a dark matter halo of mass M contains N LRGs, and assuming that the radial distribution of satellite LRGs within halos traces the Navarro-Frenk-White (NFW) dark matter density profile. We find that varying P(N|M) alone is not sufficient to match the small-scale data. We next allow the concentration of satellite LRG galaxies to differ from that of dark matter and find that this is also not sufficient. Finally, we relax the assumption of an NFW profile and allow the inner slope of the density profile to vary. We find that this model provides a good fit to the data and the resulting value of the slope is -2.17 +- 0.12. The radial density profile of satellite LRGs within halos is thus not compatible with that of the underlying dark matter, but rather is closer to an isothermal distribution.</description><subject>Astronomy</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>CORRELATION FUNCTIONS</subject><subject>COSMOLOGY</subject><subject>DISTRIBUTION</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>FUNCTIONS</subject><subject>GALAXIES</subject><subject>MATTER</subject><subject>NONLUMINOUS MATTER</subject><subject>PROBABILITY</subject><subject>SATELLITES</subject><subject>SIMULATION</subject><subject>SPATIAL DISTRIBUTION</subject><subject>UNIVERSE</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNp9kN9LwzAQx4MoOKd_gS8FEUHomjTpmj6OoVOYCE7Ft5CmFxdJf9i04P57Uyp7UXw67u5zX44PQucEzwjmPMIYs3BO07coxVlEIkKSAzQhCeUho0l6iCZ74hidOPcxtHGWTdDioS7Amuo96LYQvEK7CzaltDbYKGkhWNreddAO-1oH6740Vd274AmKYCWt_DLgTtGRltbB2U-dopfbm-flXbh-XN0vF-tQJTHrwrnOeaqJ1DzJ0yKDXCWMz4ECS0ghWSFz0FymuZJckSIGFmNQ2I-ZKnImgU7RxZhbu84Ip0wHaqvqqgLViZjQLKYs9dTVSDVt_dmD60RpnAJrZQX-c8FZxlIS08yTdCRVWzvXghZNa0rZ7gTBYrAqBklicCa8VUGEt-qvLn_ypfOGdCsrZdz-NPZSEx_uueuRM3Wz3_4RKJpCe3j2G_7vi2_0C5LV</recordid><startdate>20100120</startdate><enddate>20100120</enddate><creator>Watson, Douglas F</creator><creator>Berlind, Andreas A</creator><creator>McBride, Cameron K</creator><creator>Masjedi, Morad</creator><general>IOP Publishing</general><general>IOP</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>OTOTI</scope></search><sort><creationdate>20100120</creationdate><title>Modeling the Very Small Scale Clustering of Luminous Red Galaxies</title><author>Watson, Douglas F ; Berlind, Andreas A ; McBride, Cameron K ; Masjedi, Morad</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c524t-6fb87f1af85b7d9ebc5486e3e451da4dabef8a7bca8c1d2e420ec0dab4cdb4ae3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Astronomy</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>CORRELATION FUNCTIONS</topic><topic>COSMOLOGY</topic><topic>DISTRIBUTION</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>FUNCTIONS</topic><topic>GALAXIES</topic><topic>MATTER</topic><topic>NONLUMINOUS MATTER</topic><topic>PROBABILITY</topic><topic>SATELLITES</topic><topic>SIMULATION</topic><topic>SPATIAL DISTRIBUTION</topic><topic>UNIVERSE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Watson, Douglas F</creatorcontrib><creatorcontrib>Berlind, Andreas A</creatorcontrib><creatorcontrib>McBride, Cameron K</creatorcontrib><creatorcontrib>Masjedi, Morad</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Watson, Douglas F</au><au>Berlind, Andreas A</au><au>McBride, Cameron K</au><au>Masjedi, Morad</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Modeling the Very Small Scale Clustering of Luminous Red Galaxies</atitle><jtitle>The Astrophysical journal</jtitle><date>2010-01-20</date><risdate>2010</risdate><volume>709</volume><issue>1</issue><spage>115</spage><epage>134</epage><pages>115-134</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>We model the small-scale clustering of luminous red galaxies (LRGs) in the Sloan Digital Sky Survey. Specifically, we use the halo occupation distribution formalism to model the projected two-point correlation function of LRGs on scales well within the sizes of their host halos (0.016 h {sup -1} Mpc <= r <= 0.42 h {sup -1} Mpc). We start by varying P(N|M), the probability distribution that a dark matter halo of mass M contains N LRGs, and assuming that the radial distribution of satellite LRGs within halos traces the Navarro-Frenk-White (NFW) dark matter density profile. We find that varying P(N|M) alone is not sufficient to match the small-scale data. We next allow the concentration of satellite LRG galaxies to differ from that of dark matter and find that this is also not sufficient. Finally, we relax the assumption of an NFW profile and allow the inner slope of the density profile to vary. We find that this model provides a good fit to the data and the resulting value of the slope is -2.17 +- 0.12. 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subjects | Astronomy ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CORRELATION FUNCTIONS COSMOLOGY DISTRIBUTION Earth, ocean, space Exact sciences and technology FUNCTIONS GALAXIES MATTER NONLUMINOUS MATTER PROBABILITY SATELLITES SIMULATION SPATIAL DISTRIBUTION UNIVERSE |
title | Modeling the Very Small Scale Clustering of Luminous Red Galaxies |
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