Non-parametric morphologies of mergers in the Illustris simulation

We study non-parametric morphologies of mergers events in a cosmological context, using the Illustris project. We produce mock g-band images comparable to observational surveys from the publicly available Illustris simulation idealized mock images at z = 0. We then measure non-parametric indicators:...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2017
Materias:
Galaxies: evolution
Galaxies: interactions
Galaxies: structure
Methods: numerical
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v465_n1_p1106_Bignone
http://hdl.handle.net/20.500.12110/paper_00358711_v465_n1_p1106_Bignone
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v465_n1_p1106_Bignone
record_format dspace
spelling paper:paper_00358711_v465_n1_p1106_Bignone2023-06-08T15:01:44Z Non-parametric morphologies of mergers in the Illustris simulation Galaxies: evolution Galaxies: interactions Galaxies: structure Methods: numerical We study non-parametric morphologies of mergers events in a cosmological context, using the Illustris project. We produce mock g-band images comparable to observational surveys from the publicly available Illustris simulation idealized mock images at z = 0. We then measure non-parametric indicators: asymmetry, Gini, M20, clumpiness, and concentration for a set of galaxies with M* > 1010 M⊙. We correlate these automatic statistics with the recent merger history of galaxies and with the presence of close companions. Our main contribution is to assess in a cosmological framework, the empirically derived non-parametric demarcation line and average time-scales used to determine the merger rate observationally. We found that 98 per cent of galaxies above the demarcation line have a close companion or have experienced a recent merger event. On average, merger signatures obtained from the G-M20 criterion anti-correlate clearly with the elapsing time to the last merger event.We also find that the asymmetry correlates with galaxy pair separation and relative velocity, exhibiting the larger enhancements for those systems with pair separations d < 50 h-1 kpc and relative velocities V < 350 km s-1. We find that the G-M20 is most sensitive to recent mergers (~0.14 Gyr) and to ongoing mergers with stellar mass ratios greater than 0.1. For this indicator, we compute a merger average observability time-scale of ~0.2 Gyr, in agreement with previous results and demonstrate that the morphologically derived merger rate recovers the intrinsic total merger rate of the simulation and the merger rate as a function of stellar mass. © 2016 The Authors. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v465_n1_p1106_Bignone http://hdl.handle.net/20.500.12110/paper_00358711_v465_n1_p1106_Bignone
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: evolution
Galaxies: interactions
Galaxies: structure
Methods: numerical
spellingShingle Galaxies: evolution
Galaxies: interactions
Galaxies: structure
Methods: numerical
Non-parametric morphologies of mergers in the Illustris simulation
topic_facet Galaxies: evolution
Galaxies: interactions
Galaxies: structure
Methods: numerical
description We study non-parametric morphologies of mergers events in a cosmological context, using the Illustris project. We produce mock g-band images comparable to observational surveys from the publicly available Illustris simulation idealized mock images at z = 0. We then measure non-parametric indicators: asymmetry, Gini, M20, clumpiness, and concentration for a set of galaxies with M* > 1010 M⊙. We correlate these automatic statistics with the recent merger history of galaxies and with the presence of close companions. Our main contribution is to assess in a cosmological framework, the empirically derived non-parametric demarcation line and average time-scales used to determine the merger rate observationally. We found that 98 per cent of galaxies above the demarcation line have a close companion or have experienced a recent merger event. On average, merger signatures obtained from the G-M20 criterion anti-correlate clearly with the elapsing time to the last merger event.We also find that the asymmetry correlates with galaxy pair separation and relative velocity, exhibiting the larger enhancements for those systems with pair separations d < 50 h-1 kpc and relative velocities V < 350 km s-1. We find that the G-M20 is most sensitive to recent mergers (~0.14 Gyr) and to ongoing mergers with stellar mass ratios greater than 0.1. For this indicator, we compute a merger average observability time-scale of ~0.2 Gyr, in agreement with previous results and demonstrate that the morphologically derived merger rate recovers the intrinsic total merger rate of the simulation and the merger rate as a function of stellar mass. © 2016 The Authors.
title Non-parametric morphologies of mergers in the Illustris simulation
title_short Non-parametric morphologies of mergers in the Illustris simulation
title_full Non-parametric morphologies of mergers in the Illustris simulation
title_fullStr Non-parametric morphologies of mergers in the Illustris simulation
title_full_unstemmed Non-parametric morphologies of mergers in the Illustris simulation
title_sort non-parametric morphologies of mergers in the illustris simulation
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v465_n1_p1106_Bignone
http://hdl.handle.net/20.500.12110/paper_00358711_v465_n1_p1106_Bignone
_version_ 1768543409657610240

Ejemplares similares