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Weak-lensing analysis of galaxy pairs using CS82 data

文献类型:期刊论文

作者Johana Gonzlez, Elizabeth5,7; Rodriguez, Facundo5,7; Garcia Lambas, Diego5,7; Makler, Martin6; Mesa, Valeria4; Alonso, Sol3; Duplancic, Fernanda3; Pereira, Mara E. S.2; Shan, HuanYuan1
刊名ASTRONOMY & ASTROPHYSICS
出版日期2019-01-15
卷号621页码:10
ISSN号1432-0746
关键词galaxies: interactions galaxies: groups: general gravitational lensing: weak
DOI10.1051/0004-6361/201834206
英文摘要Here we analyze a sample of close galaxy pairs (relative projected separation <25 h(-1) kpc and relative radial velocities <350 km s(-1)) using a weak-lensing analysis based on the Canada-France-Hawaii Telescope Stripe 82 Survey (CS82). We determine halo masses for the total sample of pairs as well as for interacting, red, and higher-luminosity pair subsamples with similar to 3 sigma confidence. The derived lensing signal for the total sample can be fitted either by a Singular Isothermal Sphere (SIS) with sigma(V) = 223 +/- 24 km s(-1) or a Navarro-Frenk-White (NFW) profile with R-200 = 0.30 +/- 0.03 h(-1) Mpc. The pair total masses and total r band luminosities imply an average mass-to-light ratio of similar to 200 h M-circle dot/L-circle dot. On the other hand, red pairs which include a larger fraction of elliptical galaxies, show a larger mass-to-light ratio of similar to 345 h M-circle dot/L-circle dot. Derived lensing masses were compared to a proxy of the dynamical mass, obtaining a good correlation. However, there is a large discrepancy between lensing masses and the dynamical mass estimates, which could be accounted for by astrophysical processes such as dynamical friction, by the inclusion of unbound pairs, and by significant deviations of the density distribution from SIS and NFW profiles in the inner regions. We also compared lensing masses with group mass estimates, finding very good agreement with the sample of groups with two members. Red and blue pairs show large differences between group and lensing masses, which is likely due to the single mass-to-light ratio adopted to compute the group masses.
资助项目Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET, Argentina) ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba (SeCyT-UNC, Argentina) ; Secretaria de Ciencia y Tecnica de la Universidad Nacional de San Juan ; Brazilian Council for Scientific and Technological Development (CNPq) ; Rio de Janeiro Research Foundation (FAPERJ) ; PCI BEV fellowship program from MCTI ; CBPF ; Laboratorio Interinstitucional de e-Astronomia (LIneA) ; Alfred P. Sloan Foundation ; National Science Foundation ; U.S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England ; American Museum of Natural History ; Astrophysical Institute Potsdam ; University of Basel ; University of Cambridge ; Case Western Reserve University ; University of Chicago ; Drexel University ; Fermilab ; Institute for Advanced Study ; Japan Participation Group ; Johns Hopkins University ; Joint Institute for Nuclear Astrophysics ; Kavli Institute for Particle Astrophysics and Cosmology ; Korean Scientist Group ; Chinese Academy of Sciences (LAMOST) ; Los Alamos National Laboratory ; Max-Planck-Institute for Astronomy (MPIA) ; MaxPlanck-Institute for Astrophysics (MPA) ; New Mexico State University ; Ohio State University ; University of Pittsburgh ; University of Portsmouth ; Princeton University ; United States Naval Observatory ; University of Washington
WOS研究方向Astronomy & Astrophysics
语种英语
出版者EDP SCIENCES S A
WOS记录号WOS:000455571500001
源URL[http://119.78.226.72/handle/331011/31981]  
专题中国科学院上海天文台
通讯作者Johana Gonzlez, Elizabeth
作者单位1.Shanghai Astron Observ SHAO, Nandan Rd 80, Shanghai 200030, Peoples R China
2.Brandeis Univ, 415 South St, Waltham, MA 02453 USA
3.UNSJ, FCEFyN, CONICET, Dept Geofis & Astron, Av Ignacio de la Roza 590 O,J5402DCS, San Juan, Argentina
4.Consejo Nacl Invest Cient & Tecn, Inst Argentino Nivol Glaciol & Ciencias Ambient I, Parque Gral San Martin,CC 330,CP 5500, Mendoza, Argentina
5.Univ Nacl Cordoba, Observ Astron Cordoba, Laprida 854,X5000BGR, Cordoba, Argentina
6.CBPF, BR-22290180 Rio De Janeiro, RJ, Brazil
7.Consejo Nacl Invest Cient & Tecn, IATE, Laprida 854,X5000BGR, Cordoba, Argentina
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Johana Gonzlez, Elizabeth,Rodriguez, Facundo,Garcia Lambas, Diego,et al. Weak-lensing analysis of galaxy pairs using CS82 data[J]. ASTRONOMY & ASTROPHYSICS,2019,621:10.
APA Johana Gonzlez, Elizabeth.,Rodriguez, Facundo.,Garcia Lambas, Diego.,Makler, Martin.,Mesa, Valeria.,...&Shan, HuanYuan.(2019).Weak-lensing analysis of galaxy pairs using CS82 data.ASTRONOMY & ASTROPHYSICS,621,10.
MLA Johana Gonzlez, Elizabeth,et al."Weak-lensing analysis of galaxy pairs using CS82 data".ASTRONOMY & ASTROPHYSICS 621(2019):10.

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