Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system

We present the results of a photometric study of the early-type galaxy NGC 6876 and the surrounding globular cluster system (GCS). The host galaxy is a massive elliptical, the brightest of this type in the Pavo Group. According to its intrinsic brightness (Mv~-22.7), it is expected to belong to a ga...

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Autores principales: Ennis, Ana Inés, Bassino, Lilia Patricia, Caso, Juan Pablo, De Bórtoli, Bruno Javier
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: star clusters: individual: NGC6876
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125538
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125538
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: star clusters: individual: NGC6876
spellingShingle Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: star clusters: individual: NGC6876
Ennis, Ana Inés
Bassino, Lilia Patricia
Caso, Juan Pablo
De Bórtoli, Bruno Javier
Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
topic_facet Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: star clusters: individual: NGC6876
description We present the results of a photometric study of the early-type galaxy NGC 6876 and the surrounding globular cluster system (GCS). The host galaxy is a massive elliptical, the brightest of this type in the Pavo Group. According to its intrinsic brightness (Mv~-22.7), it is expected to belong to a galaxy cluster instead of a poor group. Observational material consists of g', r', i' images obtained with the Gemini/GMOS camera. The selected globular cluster (GC) candidates present a clear bimodal colour distribution at different galactocentric radii, with mean colours and dispersions for the metal-poor ("blue") and metal-rich ("red") typical of old GCs. The red subpopulation dominates close to the galaxy centre, in addition to the radial projected distribution showing that they are more concentrated towards the galaxy centre. The azimuthal projected distribution shows an overdensity in the red subpopulation in the direction of a trail observed in X-ray that could be evidence of interactions with its spiral neighbour NGC 6872. The turn-over of the luminosity function gives an estimated distance modulus (m - M) ≈ 33.5 and the total population amounts to 9400 GCs, i.e. a quite populous system. The halo mass obtained using the number ratio (i.e. the number of GCs with respect to the baryonic and dark mass) gives a total of ~10^13, meaning it is a very massive galaxy, given the environment.
format Articulo
Articulo
author Ennis, Ana Inés
Bassino, Lilia Patricia
Caso, Juan Pablo
De Bórtoli, Bruno Javier
author_facet Ennis, Ana Inés
Bassino, Lilia Patricia
Caso, Juan Pablo
De Bórtoli, Bruno Javier
author_sort Ennis, Ana Inés
title Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
title_short Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
title_full Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
title_fullStr Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
title_full_unstemmed Early-type galaxies in low-density environments: NGC 6876 explored through its globular cluster system
title_sort early-type galaxies in low-density environments: ngc 6876 explored through its globular cluster system
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/125538
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AT bassinoliliapatricia earlytypegalaxiesinlowdensityenvironmentsngc6876exploredthroughitsglobularclustersystem
AT casojuanpablo earlytypegalaxiesinlowdensityenvironmentsngc6876exploredthroughitsglobularclustersystem
AT debortolibrunojavier earlytypegalaxiesinlowdensityenvironmentsngc6876exploredthroughitsglobularclustersystem
bdutipo_str Repositorios
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