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 transition-type 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 (νr) = 2461 ± 84km s-1 (z = 0.0082), and a moderate dispersion of σνr = 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 (σνr ∼290km s-1). This is in contrast to late-type galaxies, which seem to display a broader distribution (σνr ∼680 km s-1).
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Galaxies: clusters: individual: NGC 5044 Group
Galaxies: dwarf
Galaxies: kinematics and dynamics
Galaxies: photometry
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84423

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network_name_str SEDICI (UNLP)
spelling The low-luminosity galaxy population in the NGC 5044 groupCellone, Sergio AldoBuzzoni, AlbertoCiencias AstronómicasGalaxies: clusters: individual: NGC 5044 GroupGalaxies: dwarfGalaxies: kinematics and dynamicsGalaxies: photometryWe 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 transition-type 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 (ν<SUB>r</SUB>) = 2461 ± 84km s<SUP>-1</SUP> (z = 0.0082), and a moderate dispersion of σ<SUB>ν<sub>r</sub></SUB> = 431 km s<SUP>-1</SUP>. Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σ<SUB>ν<sub>r</sub></SUB> ∼290km s<SUP>-1</SUP>). This is in contrast to late-type galaxies, which seem to display a broader distribution (σ<SUB>ν<sub>r</sub></SUB> ∼680 km s<SUP>-1</SUP>).Facultad de Ciencias Astronómicas y Geofísicas2005info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf41-53http://sedici.unlp.edu.ar/handle/10915/84423enginfo:eu-repo/semantics/altIdentifier/issn/0035-8711info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2004.08422.xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:14Zoai:sedici.unlp.edu.ar:10915/84423Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:15.317SEDICI (UNLP) - Universidad Nacional de La Platafalse
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
Ciencias Astronómicas
Galaxies: clusters: individual: NGC 5044 Group
Galaxies: dwarf
Galaxies: kinematics and dynamics
Galaxies: 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 Ciencias Astronómicas
Galaxies: clusters: individual: NGC 5044 Group
Galaxies: dwarf
Galaxies: kinematics and dynamics
Galaxies: photometry
topic Ciencias Astronómicas
Galaxies: clusters: individual: NGC 5044 Group
Galaxies: dwarf
Galaxies: kinematics and dynamics
Galaxies: photometry
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 transition-type 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 (ν<SUB>r</SUB>) = 2461 ± 84km s<SUP>-1</SUP> (z = 0.0082), and a moderate dispersion of σ<SUB>ν<sub>r</sub></SUB> = 431 km s<SUP>-1</SUP>. Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σ<SUB>ν<sub>r</sub></SUB> ∼290km s<SUP>-1</SUP>). This is in contrast to late-type galaxies, which seem to display a broader distribution (σ<SUB>ν<sub>r</sub></SUB> ∼680 km s<SUP>-1</SUP>).
Facultad de Ciencias Astronómicas y Geofísicas
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 transition-type 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 (ν<SUB>r</SUB>) = 2461 ± 84km s<SUP>-1</SUP> (z = 0.0082), and a moderate dispersion of σ<SUB>ν<sub>r</sub></SUB> = 431 km s<SUP>-1</SUP>. Our kinematical data show no luminosity segregation for early-type galaxies: both dwarf and bright E/S0 systems show very similar velocity distributions (σ<SUB>ν<sub>r</sub></SUB> ∼290km s<SUP>-1</SUP>). This is in contrast to late-type galaxies, which seem to display a broader distribution (σ<SUB>ν<sub>r</sub></SUB> ∼680 km s<SUP>-1</SUP>).
publishDate 2005
dc.date.none.fl_str_mv 2005
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/84423
url http://sedici.unlp.edu.ar/handle/10915/84423
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0035-8711
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2004.08422.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
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