The low-luminosity galaxy population in the NGC 5044 Group

Autores
Cellone, Sergio Aldo; Buzzoni, Alberto
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present multicolour imaging for a sample of 33 dwarf and intermediate-luminosity galaxies in the field of the NGC 5044 Group, complemented with mid-resolution spectroscopy for a subsample of 13 objects. With these data, a revised membership and morphological classification is made for the galaxies in the sample. We were able to confirm all but one of the ‘definite members’ included in the spectroscopic subsample, galaxies which were originally classified based on morphological criteria. An important fraction of background galaxies, however, is probably present among ‘likely’ and ‘possible’ members. The presence of a nucleus could be detected in just five out of the nine galaxies originally classified as dE,N, confirming the intrinsic difficulty of photographic-plate morphological classification for this kind of object. Our deep surface photometry provided clear evidence for disc structure in at least three galaxies previously catalogued as dE or dS0. Their transitiontype properties are also evident from the colour–magnitude diagram, where they lie near the late-type galaxy locus, suggesting an evolutionary connection between a parent disc-galaxy population and at least some present-day dEs. Six new dSph candidates were also found, most of them at small projected distances from NGC 5044, the central galaxy of the group. The NGC 5044 Group appears clearly defined in redshift space, with a mean heliocentric radial velocity of vr = 2461 ± 84 km s−1 (z = 0.0082), and a moderate dispersion of σvr = 431 km s−1 . Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σvr ∼ 290 km s−1 ). This is in contrast to late-type galaxies, which seem to display a broader distribution (σvr ∼ 680 km s−1 )
Fil: Cellone, Sergio Aldo. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Buzzoni, Alberto. Osservatorio Astronomico di Bologna; Italia
Materia
Clusters
NGC 5044 Group
Dwarf galaxies
Kinematics (galaxias)
Dynamics (galaxias)
Photometry
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:11336/38402

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spelling The low-luminosity galaxy population in the NGC 5044 GroupCellone, Sergio AldoBuzzoni, AlbertoClustersNGC 5044 GroupDwarf galaxiesKinematics (galaxias)Dynamics (galaxias)Photometryhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present multicolour imaging for a sample of 33 dwarf and intermediate-luminosity galaxies in the field of the NGC 5044 Group, complemented with mid-resolution spectroscopy for a subsample of 13 objects. With these data, a revised membership and morphological classification is made for the galaxies in the sample. We were able to confirm all but one of the ‘definite members’ included in the spectroscopic subsample, galaxies which were originally classified based on morphological criteria. An important fraction of background galaxies, however, is probably present among ‘likely’ and ‘possible’ members. The presence of a nucleus could be detected in just five out of the nine galaxies originally classified as dE,N, confirming the intrinsic difficulty of photographic-plate morphological classification for this kind of object. Our deep surface photometry provided clear evidence for disc structure in at least three galaxies previously catalogued as dE or dS0. Their transitiontype properties are also evident from the colour–magnitude diagram, where they lie near the late-type galaxy locus, suggesting an evolutionary connection between a parent disc-galaxy population and at least some present-day dEs. Six new dSph candidates were also found, most of them at small projected distances from NGC 5044, the central galaxy of the group. The NGC 5044 Group appears clearly defined in redshift space, with a mean heliocentric radial velocity of vr = 2461 ± 84 km s−1 (z = 0.0082), and a moderate dispersion of σvr = 431 km s−1 . Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σvr ∼ 290 km s−1 ). This is in contrast to late-type galaxies, which seem to display a broader distribution (σvr ∼ 680 km s−1 )Fil: Cellone, Sergio Aldo. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Buzzoni, Alberto. Osservatorio Astronomico di Bologna; ItaliaWiley Blackwell Publishing, Inc2005-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/38402Cellone, Sergio Aldo; Buzzoni, Alberto; The low-luminosity galaxy population in the NGC 5044 Group; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 356; 12-2005; 41-530035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/doi.org/10.1007/978-3-540-71173-5_14info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/chapter/10.1007/978-3-540-71173-5_14info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:45:04Zoai:ri.conicet.gov.ar:11336/38402instacron: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:34982025-09-29 10:45:05.155CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The low-luminosity galaxy population in the NGC 5044 Group
title The low-luminosity galaxy population in the NGC 5044 Group
spellingShingle The low-luminosity galaxy population in the NGC 5044 Group
Cellone, Sergio Aldo
Clusters
NGC 5044 Group
Dwarf galaxies
Kinematics (galaxias)
Dynamics (galaxias)
Photometry
title_short The low-luminosity galaxy population in the NGC 5044 Group
title_full The low-luminosity galaxy population in the NGC 5044 Group
title_fullStr The low-luminosity galaxy population in the NGC 5044 Group
title_full_unstemmed The low-luminosity galaxy population in the NGC 5044 Group
title_sort The low-luminosity galaxy population in the NGC 5044 Group
dc.creator.none.fl_str_mv Cellone, Sergio Aldo
Buzzoni, Alberto
author Cellone, Sergio Aldo
author_facet Cellone, Sergio Aldo
Buzzoni, Alberto
author_role author
author2 Buzzoni, Alberto
author2_role author
dc.subject.none.fl_str_mv Clusters
NGC 5044 Group
Dwarf galaxies
Kinematics (galaxias)
Dynamics (galaxias)
Photometry
topic Clusters
NGC 5044 Group
Dwarf galaxies
Kinematics (galaxias)
Dynamics (galaxias)
Photometry
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present multicolour imaging for a sample of 33 dwarf and intermediate-luminosity galaxies in the field of the NGC 5044 Group, complemented with mid-resolution spectroscopy for a subsample of 13 objects. With these data, a revised membership and morphological classification is made for the galaxies in the sample. We were able to confirm all but one of the ‘definite members’ included in the spectroscopic subsample, galaxies which were originally classified based on morphological criteria. An important fraction of background galaxies, however, is probably present among ‘likely’ and ‘possible’ members. The presence of a nucleus could be detected in just five out of the nine galaxies originally classified as dE,N, confirming the intrinsic difficulty of photographic-plate morphological classification for this kind of object. Our deep surface photometry provided clear evidence for disc structure in at least three galaxies previously catalogued as dE or dS0. Their transitiontype properties are also evident from the colour–magnitude diagram, where they lie near the late-type galaxy locus, suggesting an evolutionary connection between a parent disc-galaxy population and at least some present-day dEs. Six new dSph candidates were also found, most of them at small projected distances from NGC 5044, the central galaxy of the group. The NGC 5044 Group appears clearly defined in redshift space, with a mean heliocentric radial velocity of vr = 2461 ± 84 km s−1 (z = 0.0082), and a moderate dispersion of σvr = 431 km s−1 . Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σvr ∼ 290 km s−1 ). This is in contrast to late-type galaxies, which seem to display a broader distribution (σvr ∼ 680 km s−1 )
Fil: Cellone, Sergio Aldo. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Buzzoni, Alberto. Osservatorio Astronomico di Bologna; Italia
description We present multicolour imaging for a sample of 33 dwarf and intermediate-luminosity galaxies in the field of the NGC 5044 Group, complemented with mid-resolution spectroscopy for a subsample of 13 objects. With these data, a revised membership and morphological classification is made for the galaxies in the sample. We were able to confirm all but one of the ‘definite members’ included in the spectroscopic subsample, galaxies which were originally classified based on morphological criteria. An important fraction of background galaxies, however, is probably present among ‘likely’ and ‘possible’ members. The presence of a nucleus could be detected in just five out of the nine galaxies originally classified as dE,N, confirming the intrinsic difficulty of photographic-plate morphological classification for this kind of object. Our deep surface photometry provided clear evidence for disc structure in at least three galaxies previously catalogued as dE or dS0. Their transitiontype properties are also evident from the colour–magnitude diagram, where they lie near the late-type galaxy locus, suggesting an evolutionary connection between a parent disc-galaxy population and at least some present-day dEs. Six new dSph candidates were also found, most of them at small projected distances from NGC 5044, the central galaxy of the group. The NGC 5044 Group appears clearly defined in redshift space, with a mean heliocentric radial velocity of vr = 2461 ± 84 km s−1 (z = 0.0082), and a moderate dispersion of σvr = 431 km s−1 . Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σvr ∼ 290 km s−1 ). This is in contrast to late-type galaxies, which seem to display a broader distribution (σvr ∼ 680 km s−1 )
publishDate 2005
dc.date.none.fl_str_mv 2005-12
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/11336/38402
Cellone, Sergio Aldo; Buzzoni, Alberto; The low-luminosity galaxy population in the NGC 5044 Group; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 356; 12-2005; 41-53
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/38402
identifier_str_mv Cellone, Sergio Aldo; Buzzoni, Alberto; The low-luminosity galaxy population in the NGC 5044 Group; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 356; 12-2005; 41-53
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1007/978-3-540-71173-5_14
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/chapter/10.1007/978-3-540-71173-5_14
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
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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