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Artículo

Galaxies infalling into groups: Filaments versus isotropic infall

Martinez Atencio, Hector JulianIcon ; Muriel, HernanIcon ; Coenda, ValeriaIcon
Fecha de publicación: 10/2015
Editorial: Oxford University Press
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We perform a comparative analysis of the properties of galaxies infalling into groups classifying them accordingly to whether they are: Falling along filamentary structures; or they are falling isotropically. For this purpose, we identify filamentary structures connecting massive groups of galaxies in the SDSS. We perform a comparative analysis of some properties of galaxies in filaments, in the isotropic infall region, in the field, and in groups. We study the luminosity functions (LF) and the dependence of the specific star formation rate (SSFR) on stellar mass, galaxy type, and projected distance to the groups that define the filaments. We find that the LF of galaxies in filaments and in the isotropic infalling region are basically indistinguishable between them, with the possible exception of late-type galaxies. On the other hand, regardless of galaxy type, their LFs are clearly different from that of field or group galaxies. Both of them have characteristic absolute magnitudes and faint end slopes in between the field and group values. More significant differences between galaxies in filaments and in the isotropic infall region are observed when we analyse the SSFR. We find that galaxies in filaments have a systematically higher fraction of galaxies with low SSFR as a function of both, stellar mass and distance to the groups, indicating a stronger quenching of the star formation in the filaments compared to both, the isotropic infalling region, and the field. Our results suggest that some physical mechanisms that determine the differences observed between field galaxies and galaxies in systems, affect galaxies even when they are not yet within the systems.
Palabras clave: Evolution , Galaxies , Galaxies , Galaxies , Galaxies , Galaxies , General , Groups , Luminosity Function , Mass Function , Star Formation , Statistics
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/69695
DOI: http://dx.doi.org/10.1093/mnras/stv2295
URL: https://academic.oup.com/mnras/article/455/1/127/984629
URL: https://arxiv.org/abs/1510.00390
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Articulos(IATE)
Articulos de INST.DE ASTRONOMIA TEORICA Y EXPERIMENTAL
Citación
Martinez Atencio, Hector Julian; Muriel, Hernan; Coenda, Valeria; Galaxies infalling into groups: Filaments versus isotropic infall; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 455; 1; 10-2015; 127-135
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