{"id":3780,"date":"2022-06-09T14:08:16","date_gmt":"2022-06-09T17:08:16","guid":{"rendered":"https:\/\/iate.oac.uncor.edu\/?p=3780"},"modified":"2022-06-09T14:08:31","modified_gmt":"2022-06-09T17:08:31","slug":"viernes-10-06-modelling-the-formation-of-the-gd-1-stellar-stream-inside-a-host-with-a-fermionic-dark-matter-core-halo-distribution","status":"publish","type":"post","link":"https:\/\/iate.oac.uncor.edu\/en\/2022\/06\/09\/viernes-10-06-modelling-the-formation-of-the-gd-1-stellar-stream-inside-a-host-with-a-fermionic-dark-matter-core-halo-distribution\/","title":{"rendered":"Friday 06\/10: Modelling the formation of the GD-1 stellar stream inside a host with a fermionic dark matter core-halo distribution"},"content":{"rendered":"

Expositor:<\/strong> Dr. Mart\u00edn Mestre (Instituto de Astrof\u00edsica de La Plata – Facultad de Ciencias Astron\u00f3micas y Geof\u00edsicas de La Plata)<\/span><\/p>\n

Date:<\/strong> viernes 10 de junio, 14 hs<\/span><\/p>\n

Abstract:<\/strong> Stellar streams are a consequence of the tidal forces produced by a host galaxy on its satellites (i.e. globular clusters and dwarf spheroidals). <\/span>As the self-gravity of stellar streams is almost negligible, they constitute excellent probes of the gravitational potential of the host galaxy. <\/span>For this reason, some Milky Way stellar streams have been used to put constraints on the dark matter (DM) total mass and shape, under <\/span>empirical DM distributions (i.e. NFW, logarithmic, etc). In particular, Malhan et Ibata (2019) have fitted the GD-1 orbit embedded in an <\/span>axisymmetric NFW potential plus baryons, obtaining that the density flattening of the dark halo is slightly oblate. <\/span>In this work we show that it is possible to model the GD-1 stellar stream using a spherical dark matter distribution previously deduced from <\/span>first principles by means of the maximization of the coarse-grained entropy for self-gravitating fermions. For that purpose we used a genetic <\/span>algorithm in order to fit both the stream orbit’s initial conditions and the fermionic halo. We modelled the baryonic potential with a bulge and <\/span>two disks (thin and thick) with fixed parameters according to the recent literature. The stream observable is 6D phase-space data from Ibata <\/span>et al. (2020), including the Gaia DR2 survey. Besides, our fitted halo model is, by construction, in agreement with the orbits of the S-stars at <\/span>Sagittarius A*, thus mimicking the paradigmatic supermassive black hole gravitational effect.<\/span><\/p>\n

Seminar link: https:\/\/meet.google.com\/dww-axto-tdf<\/a><\/span><\/p>","protected":false},"excerpt":{"rendered":"

Expositor: Dr. Mart\u00edn Mestre (Instituto de Astrof\u00edsica de La Plata – Facultad de Ciencias Astron\u00f3micas y Geof\u00edsicas de La Plata) Fecha: viernes 10 de junio, 14 hs Resumen: Stellar streams are a consequence of the tidal forces produced by a host galaxy on its satellites (i.e. globular clusters and dwarf…<\/p>","protected":false},"author":1,"featured_media":3781,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,9],"tags":[],"class_list":["post-3780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades","category-seminarios"],"_links":{"self":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/3780","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/comments?post=3780"}],"version-history":[{"count":0,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/3780\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media\/3781"}],"wp:attachment":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media?parent=3780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/categories?post=3780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/tags?post=3780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}