SPATIAL ANISOTROPY OF GALAXY KINEMATICS IN SLOAN DIGITAL SKY SURVEY GALAXY CLUSTERS
Measurements of galaxy cluster kinematics are important in understanding the dynamical state and evolution of clusters of galaxies, as well as constraining cosmological models. While it is well established that clusters exhibit non-spherical geometries, evident in the distribution of galaxies on the...
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| Veröffentlicht in: | Astrophysical journal. Letters 2012-10, Vol.758 (1), p.1-6 |
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| container_title | Astrophysical journal. Letters |
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| creator | SKIELBOE, ANDREAS WOJTAK, RADOSLAW Pedersen, Kristian Rozo, Eduardo RYKOFF, ELI S |
| description | Measurements of galaxy cluster kinematics are important in understanding the dynamical state and evolution of clusters of galaxies, as well as constraining cosmological models. While it is well established that clusters exhibit non-spherical geometries, evident in the distribution of galaxies on the sky, azimuthal variations of galaxy kinematics within clusters have yet to be observed. Here we measure the azimuthal dependence of the line-of-sight velocity dispersion profile in a stacked sample of 1743 galaxy clusters from the Sloan Digital Sky Survey (SDSS). The clusters are drawn from the SDSS DR8 redMaPPer catalog. We find that the line-of-sight velocity dispersion of galaxies lying along the major axis of the central galaxy is larger than those that lie along the minor axis. This is the first observational detection of anisotropic kinematics of galaxies in clusters. We show that the result is consistent with predictions from numerical simulations. Furthermore, we find that the degree of projected anisotropy is strongly dependent on the line-of-sight orientation of the galaxy cluster, opening new possibilities for assessing systematics in optical cluster finding. |
| doi_str_mv | 10.1088/2041-8205/758/1/L16 |
| format | Article |
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Letters</title><description>Measurements of galaxy cluster kinematics are important in understanding the dynamical state and evolution of clusters of galaxies, as well as constraining cosmological models. While it is well established that clusters exhibit non-spherical geometries, evident in the distribution of galaxies on the sky, azimuthal variations of galaxy kinematics within clusters have yet to be observed. Here we measure the azimuthal dependence of the line-of-sight velocity dispersion profile in a stacked sample of 1743 galaxy clusters from the Sloan Digital Sky Survey (SDSS). The clusters are drawn from the SDSS DR8 redMaPPer catalog. We find that the line-of-sight velocity dispersion of galaxies lying along the major axis of the central galaxy is larger than those that lie along the minor axis. This is the first observational detection of anisotropic kinematics of galaxies in clusters. We show that the result is consistent with predictions from numerical simulations. Furthermore, we find that the degree of projected anisotropy is strongly dependent on the line-of-sight orientation of the galaxy cluster, opening new possibilities for assessing systematics in optical cluster finding.</description><subject>ANISOTROPY</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Clusters</subject><subject>COMPUTERIZED SIMULATION</subject><subject>Constraining</subject><subject>COSMOLOGICAL MODELS</subject><subject>Cosmology</subject><subject>DETECTION</subject><subject>DISPERSIONS</subject><subject>Galactic clusters</subject><subject>GALACTIC EVOLUTION</subject><subject>GALAXIES</subject><subject>GALAXY CLUSTERS</subject><subject>Kinematics</subject><subject>Line of sight</subject><subject>SKY</subject><subject>Sky surveys (astronomy)</subject><subject>VELOCITY</subject><issn>2041-8205</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqNkU9Pg0AQxTdGE2v1E3gh8eIF2V3Yf0eCtJIiNF1q5LQBukRMWypLD357Ia2ePc1k5jfzkvcAuEfwCUHOHQw9ZHMMicMId5ATI3oBJucpci__ekiuwY0xnxBiSBGfACmXfhb5seUnkUyzVbrMrXRmzf3Yf8-tRZSEr8M-kFaUWDJO_cR6juZRNhzIRW7J9eotzH_pIF7LLFzJW3BVF1uj7851CtazMAte7DidR4Ef25XLeW8XRVmKkiHOEWXYo6JGhaC1V5ZE8BJuOC4RqwVDYkM1FJqyCrsECQrrkri1507Bw-lva_pGmarpdfVRtfu9rnqFMWScwJF6PFGHrv06atOrXWMqvd0We90ejRrEmcCcEvYPlHJMCRHugLontOpaYzpdq0PX7IruWyGoxkzU6LgaHVdDJgqpIRP3B2R6dag</recordid><startdate>20121010</startdate><enddate>20121010</enddate><creator>SKIELBOE, ANDREAS</creator><creator>WOJTAK, RADOSLAW</creator><creator>Pedersen, Kristian</creator><creator>Rozo, Eduardo</creator><creator>RYKOFF, ELI S</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20121010</creationdate><title>SPATIAL ANISOTROPY OF GALAXY KINEMATICS IN SLOAN DIGITAL SKY SURVEY GALAXY CLUSTERS</title><author>SKIELBOE, ANDREAS ; WOJTAK, RADOSLAW ; Pedersen, Kristian ; Rozo, Eduardo ; RYKOFF, ELI S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c388t-aabb9b71881672469f1a96f4bb598b0d82b17f9719d6e09e67c2351960fb53f43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>ANISOTROPY</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Clusters</topic><topic>COMPUTERIZED SIMULATION</topic><topic>Constraining</topic><topic>COSMOLOGICAL MODELS</topic><topic>Cosmology</topic><topic>DETECTION</topic><topic>DISPERSIONS</topic><topic>Galactic clusters</topic><topic>GALACTIC EVOLUTION</topic><topic>GALAXIES</topic><topic>GALAXY CLUSTERS</topic><topic>Kinematics</topic><topic>Line of sight</topic><topic>SKY</topic><topic>Sky surveys (astronomy)</topic><topic>VELOCITY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SKIELBOE, ANDREAS</creatorcontrib><creatorcontrib>WOJTAK, RADOSLAW</creatorcontrib><creatorcontrib>Pedersen, Kristian</creatorcontrib><creatorcontrib>Rozo, Eduardo</creatorcontrib><creatorcontrib>RYKOFF, ELI S</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Astrophysical journal. Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SKIELBOE, ANDREAS</au><au>WOJTAK, RADOSLAW</au><au>Pedersen, Kristian</au><au>Rozo, Eduardo</au><au>RYKOFF, ELI S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>SPATIAL ANISOTROPY OF GALAXY KINEMATICS IN SLOAN DIGITAL SKY SURVEY GALAXY CLUSTERS</atitle><jtitle>Astrophysical journal. Letters</jtitle><date>2012-10-10</date><risdate>2012</risdate><volume>758</volume><issue>1</issue><spage>1</spage><epage>6</epage><pages>1-6</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>Measurements of galaxy cluster kinematics are important in understanding the dynamical state and evolution of clusters of galaxies, as well as constraining cosmological models. While it is well established that clusters exhibit non-spherical geometries, evident in the distribution of galaxies on the sky, azimuthal variations of galaxy kinematics within clusters have yet to be observed. Here we measure the azimuthal dependence of the line-of-sight velocity dispersion profile in a stacked sample of 1743 galaxy clusters from the Sloan Digital Sky Survey (SDSS). The clusters are drawn from the SDSS DR8 redMaPPer catalog. We find that the line-of-sight velocity dispersion of galaxies lying along the major axis of the central galaxy is larger than those that lie along the minor axis. This is the first observational detection of anisotropic kinematics of galaxies in clusters. We show that the result is consistent with predictions from numerical simulations. Furthermore, we find that the degree of projected anisotropy is strongly dependent on the line-of-sight orientation of the galaxy cluster, opening new possibilities for assessing systematics in optical cluster finding.</abstract><cop>United States</cop><doi>10.1088/2041-8205/758/1/L16</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| source | IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; IOPscience extra; Alma/SFX Local Collection |
| subjects | ANISOTROPY ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Clusters COMPUTERIZED SIMULATION Constraining COSMOLOGICAL MODELS Cosmology DETECTION DISPERSIONS Galactic clusters GALACTIC EVOLUTION GALAXIES GALAXY CLUSTERS Kinematics Line of sight SKY Sky surveys (astronomy) VELOCITY |
| title | SPATIAL ANISOTROPY OF GALAXY KINEMATICS IN SLOAN DIGITAL SKY SURVEY GALAXY CLUSTERS |
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