{"id":1734,"date":"2017-12-13T11:06:29","date_gmt":"2017-12-13T14:06:29","guid":{"rendered":"https:\/\/iate.oac.uncor.edu\/?p=1734"},"modified":"2017-12-14T11:14:13","modified_gmt":"2017-12-14T14:14:13","slug":"green-valley-galaxies-as-a-transition-population-in-different-environments","status":"publish","type":"post","link":"https:\/\/iate.oac.uncor.edu\/en\/2017\/12\/13\/green-valley-galaxies-as-a-transition-population-in-different-environments\/","title":{"rendered":"Green valley galaxies as a transition population in different environments"},"content":{"rendered":"

Coenda, Valeria; Mart\u00ednez, H\u00e9ctor J.; Muriel, Hern\u00e1n<\/p>\n

Resumen<\/strong><\/p>\n

En estre trabajo (2018MNRAS.473.5617C<\/a>) presentamos un an\u00e1lisis comparativo de las propiedades de las galaxias pasivas, formadoras de estrellas y de transici\u00f3n (valle verde), en cuatro ambientes discretos: campo, grupos, las periferias y el centro de los c\u00famulos de galaxias emisores en rayos X. Construimos muestras de galaxias basados en el SDSS en los entornos mencionados con distribuciones de desplazamiento al rojo similares. La clasificaci\u00f3n de las galaxias en las tres secuencias se basa en el color UV-\u00f3ptico NUV-r. Estudiamos una serie de propiedades de galaxias: masa estelar, morfolog\u00eda, tasa espec\u00edfica de formaci\u00f3n de estrellas y la historia de la formaci\u00f3n estelar. El an\u00e1lisis de galaxias en el valle verde revela que los mecanismos f\u00edsicos responsables del enfriamiento externo se vuelven m\u00e1s eficientes al pasar del campo a entornos m\u00e1s densos.<\/p>\n

\"\"<\/p>\n

Confirmamos los hallazgos previos de que las galaxias de valle verde tienen morfolog\u00edas intermedias; adem\u00e1s, encontramos que esto parece ser independiente del medio ambiente. Con respecto a la masa estelar de galaxias en el valle verde, encontramos que tienden a ser m\u00e1s masivas en el campo que en ambientes m\u00e1s densos. En promedio, las galaxias en el valle verde representan 20% de todas las galaxias en grupos y c\u00famulos de rayos X. Encontramos evidencia de que el campo es ineficiente en la transformaci\u00f3n de galaxias de baja masa. Las galaxias en el valle verde tienen una media de formaci\u00f3n estelar intermedia entre galaxias pasivas y formadoras de estrellas, y tienen una dependencia clara y constante del medio ambiente: tanto el tiempo de inhibici\u00f3n de la formaci\u00f3n esrtelar como la amplitud de la tasa de\u00a0formaci\u00f3n de estrellas disminuyen hacia entornos de mayor densidad.<\/p>\n

 <\/p>\n

Abstract<\/strong><\/p>\n

We present a comparative analysis of the properties of passive, star-forming and transition (green valley) galaxies, in four discrete environments: field, groups, the outskirts and the core of X-ray clusters. We construct samples of galaxies from the SDSS in these environments so that they are bound to have similar redshift distributions. The classification of galaxies into the three sequences is based on the UV-optical colour NUV-r. We study a number of galaxy properties: stellar mass, morphology, specific star formation rate and the history of star formation. The analysis of green valley galaxies reveals that the physical mechanisms responsible for external quenching become more efficient moving from the field to denser environments. We confirm previous findings that green valley galaxies have intermediate morphologies, moreover, we find that this appears to be independent of the environment. Regarding the stellar mass of green valley galaxies, we find that they tend to be more massive in the field than in denser environments. On average, green valley galaxies account for 20% of all galaxies in groups and X-ray clusters. We find evidence that the field environment is inefficient in transforming low mass galaxies. Green valley galaxies have average star formation histories intermediate between passive and star forming galaxies, and have a clear and consistent dependence on the environment: both, the quenching time, and the amplitude of the star formation rate, decrease towards higher density environments.<\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

Coenda, Valeria; Mart\u00ednez, H\u00e9ctor J.; Muriel, Hern\u00e1n Resumen En estre trabajo (2018MNRAS.473.5617C) presentamos un an\u00e1lisis comparativo de las propiedades de las galaxias pasivas, formadoras de estrellas y de transici\u00f3n (valle verde), en cuatro ambientes discretos: campo, grupos, las periferias y el centro de los c\u00famulos de galaxias emisores en rayos…<\/p>","protected":false},"author":1,"featured_media":459,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades"],"_links":{"self":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/1734","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=1734"}],"version-history":[{"count":0,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/1734\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media\/459"}],"wp:attachment":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media?parent=1734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/categories?post=1734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/tags?post=1734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}