Merging encounters between equal-mass non-rotating galaxies

N-body simulations are used to investigate merging encounters between equal-mass isotropic non-rotating de Vaucouleurs-type galaxies, in order to obtain empirical correlations relating the structural parameters of merger remnants to the initial orbit and structure of the progenitors. We found that t...

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Autor principal: Navarro, Julio Fernando
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1988
Materias:
Astronomía
Galaxia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/142405
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-142405
record_format dspace
spelling I19-R120-10915-1424052024-04-09T15:41:44Z http://sedici.unlp.edu.ar/handle/10915/142405 Merging encounters between equal-mass non-rotating galaxies Navarro, Julio Fernando 1988 2022-09-20T15:30:56Z es Astronomía Galaxia N-body simulations are used to investigate merging encounters between equal-mass isotropic non-rotating de Vaucouleurs-type galaxies, in order to obtain empirical correlations relating the structural parameters of merger remnants to the initial orbit and structure of the progenitors. We found that these parameters correlate well with the orbital energy of the pair. The angular momentum of the orbit was found to influence noticeably only the internal spin of the remnant. An analysis of the locations of the remnants in the Reff - μeff plane (Reff and μeff stand for the effective radius and the logarithm of the surface density measured at Reff), relative to that of the progenitor, suggests that galaxies which have experienced several mergers in the past would be shifted respect to the Reff-μeff relation holding for normal elliptical galaxies. Such a shift might be consistent with data on the properties of brightest cluster members recently published by Schomber (1987). The density structure of the remnants of merging collisions between de Vaucouleurs galaxy models progressively approaches a de Vaucoulers profile. Transitory "light" excess in the outer parts, as found by Aguilar and White (1986) for non-merging encounters, are also produced. This suggests that some "tidally distended" galaxies (Kormendy 1977) may be actually interpreted as a merger between galaxies of comparable mass and size on its later stages. Asociación Argentina de Astronomía Articulo Comunicacion http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
spellingShingle Astronomía
Galaxia
Navarro, Julio Fernando
Merging encounters between equal-mass non-rotating galaxies
topic_facet Astronomía
Galaxia
description N-body simulations are used to investigate merging encounters between equal-mass isotropic non-rotating de Vaucouleurs-type galaxies, in order to obtain empirical correlations relating the structural parameters of merger remnants to the initial orbit and structure of the progenitors. We found that these parameters correlate well with the orbital energy of the pair. The angular momentum of the orbit was found to influence noticeably only the internal spin of the remnant. An analysis of the locations of the remnants in the Reff - μeff plane (Reff and μeff stand for the effective radius and the logarithm of the surface density measured at Reff), relative to that of the progenitor, suggests that galaxies which have experienced several mergers in the past would be shifted respect to the Reff-μeff relation holding for normal elliptical galaxies. Such a shift might be consistent with data on the properties of brightest cluster members recently published by Schomber (1987). The density structure of the remnants of merging collisions between de Vaucouleurs galaxy models progressively approaches a de Vaucoulers profile. Transitory "light" excess in the outer parts, as found by Aguilar and White (1986) for non-merging encounters, are also produced. This suggests that some "tidally distended" galaxies (Kormendy 1977) may be actually interpreted as a merger between galaxies of comparable mass and size on its later stages.
format Articulo
Comunicacion
author Navarro, Julio Fernando
author_facet Navarro, Julio Fernando
author_sort Navarro, Julio Fernando
title Merging encounters between equal-mass non-rotating galaxies
title_short Merging encounters between equal-mass non-rotating galaxies
title_full Merging encounters between equal-mass non-rotating galaxies
title_fullStr Merging encounters between equal-mass non-rotating galaxies
title_full_unstemmed Merging encounters between equal-mass non-rotating galaxies
title_sort merging encounters between equal-mass non-rotating galaxies
publishDate 1988
url http://sedici.unlp.edu.ar/handle/10915/142405
work_keys_str_mv AT navarrojuliofernando mergingencountersbetweenequalmassnonrotatinggalaxies
_version_ 1807220686417035264

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