Galaxy evolution through resolved stellar populations in the nearby Centaurus A group

Denija Crnojevic; E K Grebel; A. M. N. Ferguson; A. Koch; M. Rejkuba; Gary Da Costa; Helmut Jerjen; M. J. Irwin; E.J  Bernard; N. Arimoto; P Jablonka; Chiaki Kobayashi

Galaxy evolution through resolved stellar populations in the nearby Centaurus A group

Denija Crnojevic, E K Grebel, A. M. N. Ferguson, A. Koch, M. Rejkuba, Gary Da Costa, Helmut Jerjen, M. J. Irwin, E.J Bernard, N. Arimoto, P Jablonka, Chiaki Kobayashi

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Abstract

The CenA group is a nearby dense complex (âˆ¼ 4 Mpc) dominated by an active elliptical galaxy, hosting more than 60 dwarf companions with a variety of morphological types and stellar contents. We study the resolved stellar populations of a sample of dwarfs using optical and near-infrared data from ACS/HST and ISAAC/VLT. We characterize their recent star formation histories and metallicity content, and compare them to what is known for Local Group dwarfs, underlining similarities and differences. Our results probe the fundamental interplay between nature and nurture in the evolution of dwarfs in such a dense environment. We further present the results of the first deep survey of resolved stellar populations in the remote outer halo of our nearest giant elliptical, CenA (VIMOS/VLT optical data). Tracing its halo structure (radial profile, extent and metallicity) out to a remarkable âˆ¼ 85 kpc and comparing the halo stellar populations to those of CenAs dwarf companions enables us to constrain the mechanisms that contributed to the build-up of CenA in the context of cosmological galaxy formation models.

Original language	English
Pages (from-to)	302-305
Journal	Memorie Della Societa Astronomica Italiana
Volume	86
Publication status	Published - 2015

Cite this

@article{9e43ec964e08452b9215295a55e652f5,

title = "Galaxy evolution through resolved stellar populations in the nearby Centaurus A group",

abstract = "The CenA group is a nearby dense complex ({\^a}ˆ¼ 4 Mpc) dominated by an active elliptical galaxy, hosting more than 60 dwarf companions with a variety of morphological types and stellar contents. We study the resolved stellar populations of a sample of dwarfs using optical and near-infrared data from ACS/HST and ISAAC/VLT. We characterize their recent star formation histories and metallicity content, and compare them to what is known for Local Group dwarfs, underlining similarities and differences. Our results probe the fundamental interplay between nature and nurture in the evolution of dwarfs in such a dense environment. We further present the results of the first deep survey of resolved stellar populations in the remote outer halo of our nearest giant elliptical, CenA (VIMOS/VLT optical data). Tracing its halo structure (radial profile, extent and metallicity) out to a remarkable {\^a}ˆ¼ 85 kpc and comparing the halo stellar populations to those of CenAs dwarf companions enables us to constrain the mechanisms that contributed to the build-up of CenA in the context of cosmological galaxy formation models.",

author = "Denija Crnojevic and Grebel, {E K} and Ferguson, {A. M. N.} and A. Koch and M. Rejkuba and {Da Costa}, Gary and Helmut Jerjen and Irwin, {M. J.} and E.J Bernard and N. Arimoto and P Jablonka and Chiaki Kobayashi",

year = "2015",

language = "English",

volume = "86",

pages = "302--305",

journal = "Memorie Della Societa Astronomica Italiana",

publisher = "Societa Astronomica Italiana",

}

TY - JOUR

T1 - Galaxy evolution through resolved stellar populations in the nearby Centaurus A group

AU - Crnojevic, Denija

AU - Grebel, E K

AU - Ferguson, A. M. N.

AU - Koch, A.

AU - Rejkuba, M.

AU - Da Costa, Gary

AU - Jerjen, Helmut

AU - Irwin, M. J.

AU - Bernard, E.J

AU - Arimoto, N.

AU - Jablonka, P

AU - Kobayashi, Chiaki

PY - 2015

Y1 - 2015

N2 - The CenA group is a nearby dense complex (âˆ¼ 4 Mpc) dominated by an active elliptical galaxy, hosting more than 60 dwarf companions with a variety of morphological types and stellar contents. We study the resolved stellar populations of a sample of dwarfs using optical and near-infrared data from ACS/HST and ISAAC/VLT. We characterize their recent star formation histories and metallicity content, and compare them to what is known for Local Group dwarfs, underlining similarities and differences. Our results probe the fundamental interplay between nature and nurture in the evolution of dwarfs in such a dense environment. We further present the results of the first deep survey of resolved stellar populations in the remote outer halo of our nearest giant elliptical, CenA (VIMOS/VLT optical data). Tracing its halo structure (radial profile, extent and metallicity) out to a remarkable âˆ¼ 85 kpc and comparing the halo stellar populations to those of CenAs dwarf companions enables us to constrain the mechanisms that contributed to the build-up of CenA in the context of cosmological galaxy formation models.

AB - The CenA group is a nearby dense complex (âˆ¼ 4 Mpc) dominated by an active elliptical galaxy, hosting more than 60 dwarf companions with a variety of morphological types and stellar contents. We study the resolved stellar populations of a sample of dwarfs using optical and near-infrared data from ACS/HST and ISAAC/VLT. We characterize their recent star formation histories and metallicity content, and compare them to what is known for Local Group dwarfs, underlining similarities and differences. Our results probe the fundamental interplay between nature and nurture in the evolution of dwarfs in such a dense environment. We further present the results of the first deep survey of resolved stellar populations in the remote outer halo of our nearest giant elliptical, CenA (VIMOS/VLT optical data). Tracing its halo structure (radial profile, extent and metallicity) out to a remarkable âˆ¼ 85 kpc and comparing the halo stellar populations to those of CenAs dwarf companions enables us to constrain the mechanisms that contributed to the build-up of CenA in the context of cosmological galaxy formation models.

M3 - Article

VL - 86

SP - 302

EP - 305

JO - Memorie Della Societa Astronomica Italiana

JF - Memorie Della Societa Astronomica Italiana

ER -

Galaxy evolution through resolved stellar populations in the nearby Centaurus A group

Abstract

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