An extended star formation history in an ultra-compact dwarf

Autores
Norris, Mark A.; Escudero, Carlos Gabriel; Faifer, Favio Raúl; Kannappan, Sheila J.; Forte, Juan Carlos; van den Bosch, Remco C. E.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
There has been significant controversy over the mechanisms responsible for forming compact stellar systems like ultra compact dwarfs (UCDs), with suggestions that UCDs are simply the high mass extension of the globular cluster (GC) population, or alternatively, the liberated nuclei of galaxies tidally stripped by larger companions. Definitive examples of UCDs formed by either route have been difficult to find, with only a handful of persuasive examples of stripped-nucleus type UCDs being known. In this paper we present very deep Gemini/GMOS spectroscopic observations of the suspected stripped nucleus UCD NGC 4546-UCD1 taken in good seeing conditions (0.7´´). With these data we examine the spatially resolved kinematics and star formation history of this unusual object. We find no evidence of a rise in the central velocity dispersion of the UCD, suggesting that this UCD lacks a massive central black hole like those found in some other compact stellar systems, a conclusion confirmed by detailed dynamical modelling. Finally we are able to use our extremely high signal to noise spectrum to detect a temporally extended star formation history for this UCD. We find that the UCD was forming stars since the earliest epochs until at least 1-2 Gyr ago. Taken together these observations confirm that NGC 4546-UCD1 is the remnant nucleus of a nucleated dwarf galaxy that was tidally destroyed by NGC 4546 withinthe last 1-2 Gyr.
Fil: Norris, Mark A. . Max Planck Institut fur Astronomie; Alemania
Fil: Escudero, Carlos Gabriel. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Faifer, Favio Raúl. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Kannappan, Sheila J.. Department of Physics and Astronomy UNC-Chapel Hil; Estados Unidos
Fil: Forte, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Gobierno de la Ciudad de Buenos Aires. Secretaria de Cultura. Subsecretaria de Patrimonio Cultural. Planetario "galileo Galilei"; Argentina
Fil: van den Bosch, Remco C. E.. Max Planck Institut fur Astronomie; Alemania
Materia
Star clusters
Dwarfs
Formation of galaxies
Evolution of galaxies
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/13783
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/13783
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling An extended star formation history in an ultra-compact dwarfNorris, Mark A. Escudero, Carlos GabrielFaifer, Favio RaúlKannappan, Sheila J.Forte, Juan Carlosvan den Bosch, Remco C. E.Star clustersDwarfsFormation of galaxiesEvolution of galaxieshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1There has been significant controversy over the mechanisms responsible for forming compact stellar systems like ultra compact dwarfs (UCDs), with suggestions that UCDs are simply the high mass extension of the globular cluster (GC) population, or alternatively, the liberated nuclei of galaxies tidally stripped by larger companions. Definitive examples of UCDs formed by either route have been difficult to find, with only a handful of persuasive examples of stripped-nucleus type UCDs being known. In this paper we present very deep Gemini/GMOS spectroscopic observations of the suspected stripped nucleus UCD NGC 4546-UCD1 taken in good seeing conditions (0.7´´). With these data we examine the spatially resolved kinematics and star formation history of this unusual object. We find no evidence of a rise in the central velocity dispersion of the UCD, suggesting that this UCD lacks a massive central black hole like those found in some other compact stellar systems, a conclusion confirmed by detailed dynamical modelling. Finally we are able to use our extremely high signal to noise spectrum to detect a temporally extended star formation history for this UCD. We find that the UCD was forming stars since the earliest epochs until at least 1-2 Gyr ago. Taken together these observations confirm that NGC 4546-UCD1 is the remnant nucleus of a nucleated dwarf galaxy that was tidally destroyed by NGC 4546 withinthe last 1-2 Gyr.Fil: Norris, Mark A. . Max Planck Institut fur Astronomie; AlemaniaFil: Escudero, Carlos Gabriel. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; ArgentinaFil: Faifer, Favio Raúl. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; ArgentinaFil: Kannappan, Sheila J.. Department of Physics and Astronomy UNC-Chapel Hil; Estados UnidosFil: Forte, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Gobierno de la Ciudad de Buenos Aires. Secretaria de Cultura. Subsecretaria de Patrimonio Cultural. Planetario "galileo Galilei"; ArgentinaFil: van den Bosch, Remco C. E.. Max Planck Institut fur Astronomie; AlemaniaOxford University Press2015-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/13783Norris, Mark A. ; Escudero, Carlos Gabriel; Faifer, Favio Raúl; Kannappan, Sheila J.; Forte, Juan Carlos; et al.; An extended star formation history in an ultra-compact dwarf; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 451; 4; 6-2015; 3615-36260035-8711enginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/451/4/3615/1114743/An-extended-star-formation-history-in-an-ultra?redirectedFrom=fulltextinfo:eu-repo/semantics/altIdentifier/arxiv/http://dx.doi.org/10.1093/mnras/stv1221info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:46:23Zoai:ri.conicet.gov.ar:11336/13783instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 11:46:23.435CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv An extended star formation history in an ultra-compact dwarf
title An extended star formation history in an ultra-compact dwarf
spellingShingle An extended star formation history in an ultra-compact dwarf
Norris, Mark A.
Star clusters
Dwarfs
Formation of galaxies
Evolution of galaxies
title_short An extended star formation history in an ultra-compact dwarf
title_full An extended star formation history in an ultra-compact dwarf
title_fullStr An extended star formation history in an ultra-compact dwarf
title_full_unstemmed An extended star formation history in an ultra-compact dwarf
title_sort An extended star formation history in an ultra-compact dwarf
dc.creator.none.fl_str_mv Norris, Mark A.
Escudero, Carlos Gabriel
Faifer, Favio Raúl
Kannappan, Sheila J.
Forte, Juan Carlos
van den Bosch, Remco C. E.
author Norris, Mark A.
author_facet Norris, Mark A.
Escudero, Carlos Gabriel
Faifer, Favio Raúl
Kannappan, Sheila J.
Forte, Juan Carlos
van den Bosch, Remco C. E.
author_role author
author2 Escudero, Carlos Gabriel
Faifer, Favio Raúl
Kannappan, Sheila J.
Forte, Juan Carlos
van den Bosch, Remco C. E.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Star clusters
Dwarfs
Formation of galaxies
Evolution of galaxies
topic Star clusters
Dwarfs
Formation of galaxies
Evolution of galaxies
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv There has been significant controversy over the mechanisms responsible for forming compact stellar systems like ultra compact dwarfs (UCDs), with suggestions that UCDs are simply the high mass extension of the globular cluster (GC) population, or alternatively, the liberated nuclei of galaxies tidally stripped by larger companions. Definitive examples of UCDs formed by either route have been difficult to find, with only a handful of persuasive examples of stripped-nucleus type UCDs being known. In this paper we present very deep Gemini/GMOS spectroscopic observations of the suspected stripped nucleus UCD NGC 4546-UCD1 taken in good seeing conditions (0.7´´). With these data we examine the spatially resolved kinematics and star formation history of this unusual object. We find no evidence of a rise in the central velocity dispersion of the UCD, suggesting that this UCD lacks a massive central black hole like those found in some other compact stellar systems, a conclusion confirmed by detailed dynamical modelling. Finally we are able to use our extremely high signal to noise spectrum to detect a temporally extended star formation history for this UCD. We find that the UCD was forming stars since the earliest epochs until at least 1-2 Gyr ago. Taken together these observations confirm that NGC 4546-UCD1 is the remnant nucleus of a nucleated dwarf galaxy that was tidally destroyed by NGC 4546 withinthe last 1-2 Gyr.
Fil: Norris, Mark A. . Max Planck Institut fur Astronomie; Alemania
Fil: Escudero, Carlos Gabriel. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Faifer, Favio Raúl. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Kannappan, Sheila J.. Department of Physics and Astronomy UNC-Chapel Hil; Estados Unidos
Fil: Forte, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Gobierno de la Ciudad de Buenos Aires. Secretaria de Cultura. Subsecretaria de Patrimonio Cultural. Planetario "galileo Galilei"; Argentina
Fil: van den Bosch, Remco C. E.. Max Planck Institut fur Astronomie; Alemania
description There has been significant controversy over the mechanisms responsible for forming compact stellar systems like ultra compact dwarfs (UCDs), with suggestions that UCDs are simply the high mass extension of the globular cluster (GC) population, or alternatively, the liberated nuclei of galaxies tidally stripped by larger companions. Definitive examples of UCDs formed by either route have been difficult to find, with only a handful of persuasive examples of stripped-nucleus type UCDs being known. In this paper we present very deep Gemini/GMOS spectroscopic observations of the suspected stripped nucleus UCD NGC 4546-UCD1 taken in good seeing conditions (0.7´´). With these data we examine the spatially resolved kinematics and star formation history of this unusual object. We find no evidence of a rise in the central velocity dispersion of the UCD, suggesting that this UCD lacks a massive central black hole like those found in some other compact stellar systems, a conclusion confirmed by detailed dynamical modelling. Finally we are able to use our extremely high signal to noise spectrum to detect a temporally extended star formation history for this UCD. We find that the UCD was forming stars since the earliest epochs until at least 1-2 Gyr ago. Taken together these observations confirm that NGC 4546-UCD1 is the remnant nucleus of a nucleated dwarf galaxy that was tidally destroyed by NGC 4546 withinthe last 1-2 Gyr.
publishDate 2015
dc.date.none.fl_str_mv 2015-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/13783
Norris, Mark A. ; Escudero, Carlos Gabriel; Faifer, Favio Raúl; Kannappan, Sheila J.; Forte, Juan Carlos; et al.; An extended star formation history in an ultra-compact dwarf; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 451; 4; 6-2015; 3615-3626
0035-8711
url http://hdl.handle.net/11336/13783
identifier_str_mv Norris, Mark A. ; Escudero, Carlos Gabriel; Faifer, Favio Raúl; Kannappan, Sheila J.; Forte, Juan Carlos; et al.; An extended star formation history in an ultra-compact dwarf; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 451; 4; 6-2015; 3615-3626
0035-8711
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/451/4/3615/1114743/An-extended-star-formation-history-in-an-ultra?redirectedFrom=fulltext
info:eu-repo/semantics/altIdentifier/arxiv/http://dx.doi.org/10.1093/mnras/stv1221
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.001348

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