Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies

Autores
Smith Castelli, Analía Viviana; Faifer, Favio Raúl; Escudero, Carlos Gabriel
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. In spite of the numerous studies of low-luminosity galaxies in different environments, there is still no consensus about their formation scenario. In particular, a large number of galaxies displaying extremely low-surface brightnesses have been detected in the last year, and the nature of these objects is under discussion. Aims. In this paper we report the detection of two extended low-surface brightness (LSB) objects (μeffg′ ≃ 27 mag) found, in projection, next to NGC 3193 and in the zone of the Hickson Compact Group (HCG) 44, respectively. Methods. We analyzed deep, high-quality, GEMINI-GMOS images with ELLIPSE within IRAF in order to obtain their brightness profiles and structural parameters. We also searched for the presence of globular clusters (GC) in these fields. Results. We have found that, if these LSB galaxies were at the distances of NGC 3193 and HCG 44, they would show sizes and luminosities similar to those of the ultra-diffuse galaxies (UDGs) found in the Coma cluster and other associations. In that case, their sizes would be rather larger than those displayed by the Local Group dwarf spheroidal (dSph) galaxies. We have detected a few unresolved sources in the sky zone occupied by these galaxies showing colors and brightnesses typical of blue globular clusters. Conclusions. From the comparison of the properties of the galaxies presented in this work with those of similar objects reported in the literature, we have found that LSB galaxies display sizes covering a quite extended continous range (reff ∼ 0.3-4.5 kpc), in contrast to "normal" early-type galaxies, which show reff ∼ 1.0 kpc with a low dispersion. This fact might point to different formation processes for both types of galaxies.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
Galaxies: dwarf
Galaxies: groups: individual: HCG 44
Galaxies: star clusters: general
Methods: observational
Techniques: photometric
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:10915/85725

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/85725
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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxiesSmith Castelli, Analía VivianaFaifer, Favio RaúlEscudero, Carlos GabrielCiencias AstronómicasGalaxies: dwarfGalaxies: groups: individual: HCG 44Galaxies: star clusters: generalMethods: observationalTechniques: photometricContext. In spite of the numerous studies of low-luminosity galaxies in different environments, there is still no consensus about their formation scenario. In particular, a large number of galaxies displaying extremely low-surface brightnesses have been detected in the last year, and the nature of these objects is under discussion. Aims. In this paper we report the detection of two extended low-surface brightness (LSB) objects (μ<SUB>eff<sub>g′</sub></SUB> ≃ 27 mag) found, in projection, next to NGC 3193 and in the zone of the Hickson Compact Group (HCG) 44, respectively. Methods. We analyzed deep, high-quality, GEMINI-GMOS images with ELLIPSE within IRAF in order to obtain their brightness profiles and structural parameters. We also searched for the presence of globular clusters (GC) in these fields. Results. We have found that, if these LSB galaxies were at the distances of NGC 3193 and HCG 44, they would show sizes and luminosities similar to those of the ultra-diffuse galaxies (UDGs) found in the Coma cluster and other associations. In that case, their sizes would be rather larger than those displayed by the Local Group dwarf spheroidal (dSph) galaxies. We have detected a few unresolved sources in the sky zone occupied by these galaxies showing colors and brightnesses typical of blue globular clusters. Conclusions. From the comparison of the properties of the galaxies presented in this work with those of similar objects reported in the literature, we have found that LSB galaxies display sizes covering a quite extended continous range (r<SUB>eff</SUB> ∼ 0.3-4.5 kpc), in contrast to "normal" early-type galaxies, which show r<SUB>eff</SUB> ∼ 1.0 kpc with a low dispersion. This fact might point to different formation processes for both types of galaxies.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/85725enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628969info: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:UNLP2025-09-29T11:16:44Zoai:sedici.unlp.edu.ar:10915/85725Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:44.519SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
title Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
spellingShingle Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
Smith Castelli, Analía Viviana
Ciencias Astronómicas
Galaxies: dwarf
Galaxies: groups: individual: HCG 44
Galaxies: star clusters: general
Methods: observational
Techniques: photometric
title_short Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
title_full Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
title_fullStr Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
title_full_unstemmed Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
title_sort Stellar systems in the direction of the Hickson Compact Group 44 : I. Low surface brightness galaxies
dc.creator.none.fl_str_mv Smith Castelli, Analía Viviana
Faifer, Favio Raúl
Escudero, Carlos Gabriel
author Smith Castelli, Analía Viviana
author_facet Smith Castelli, Analía Viviana
Faifer, Favio Raúl
Escudero, Carlos Gabriel
author_role author
author2 Faifer, Favio Raúl
Escudero, Carlos Gabriel
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Galaxies: dwarf
Galaxies: groups: individual: HCG 44
Galaxies: star clusters: general
Methods: observational
Techniques: photometric
topic Ciencias Astronómicas
Galaxies: dwarf
Galaxies: groups: individual: HCG 44
Galaxies: star clusters: general
Methods: observational
Techniques: photometric
dc.description.none.fl_txt_mv Context. In spite of the numerous studies of low-luminosity galaxies in different environments, there is still no consensus about their formation scenario. In particular, a large number of galaxies displaying extremely low-surface brightnesses have been detected in the last year, and the nature of these objects is under discussion. Aims. In this paper we report the detection of two extended low-surface brightness (LSB) objects (μ<SUB>eff<sub>g′</sub></SUB> ≃ 27 mag) found, in projection, next to NGC 3193 and in the zone of the Hickson Compact Group (HCG) 44, respectively. Methods. We analyzed deep, high-quality, GEMINI-GMOS images with ELLIPSE within IRAF in order to obtain their brightness profiles and structural parameters. We also searched for the presence of globular clusters (GC) in these fields. Results. We have found that, if these LSB galaxies were at the distances of NGC 3193 and HCG 44, they would show sizes and luminosities similar to those of the ultra-diffuse galaxies (UDGs) found in the Coma cluster and other associations. In that case, their sizes would be rather larger than those displayed by the Local Group dwarf spheroidal (dSph) galaxies. We have detected a few unresolved sources in the sky zone occupied by these galaxies showing colors and brightnesses typical of blue globular clusters. Conclusions. From the comparison of the properties of the galaxies presented in this work with those of similar objects reported in the literature, we have found that LSB galaxies display sizes covering a quite extended continous range (r<SUB>eff</SUB> ∼ 0.3-4.5 kpc), in contrast to "normal" early-type galaxies, which show r<SUB>eff</SUB> ∼ 1.0 kpc with a low dispersion. This fact might point to different formation processes for both types of galaxies.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
description Context. In spite of the numerous studies of low-luminosity galaxies in different environments, there is still no consensus about their formation scenario. In particular, a large number of galaxies displaying extremely low-surface brightnesses have been detected in the last year, and the nature of these objects is under discussion. Aims. In this paper we report the detection of two extended low-surface brightness (LSB) objects (μ<SUB>eff<sub>g′</sub></SUB> ≃ 27 mag) found, in projection, next to NGC 3193 and in the zone of the Hickson Compact Group (HCG) 44, respectively. Methods. We analyzed deep, high-quality, GEMINI-GMOS images with ELLIPSE within IRAF in order to obtain their brightness profiles and structural parameters. We also searched for the presence of globular clusters (GC) in these fields. Results. We have found that, if these LSB galaxies were at the distances of NGC 3193 and HCG 44, they would show sizes and luminosities similar to those of the ultra-diffuse galaxies (UDGs) found in the Coma cluster and other associations. In that case, their sizes would be rather larger than those displayed by the Local Group dwarf spheroidal (dSph) galaxies. We have detected a few unresolved sources in the sky zone occupied by these galaxies showing colors and brightnesses typical of blue globular clusters. Conclusions. From the comparison of the properties of the galaxies presented in this work with those of similar objects reported in the literature, we have found that LSB galaxies display sizes covering a quite extended continous range (r<SUB>eff</SUB> ∼ 0.3-4.5 kpc), in contrast to "normal" early-type galaxies, which show r<SUB>eff</SUB> ∼ 1.0 kpc with a low dispersion. This fact might point to different formation processes for both types of galaxies.
publishDate 2016
dc.date.none.fl_str_mv 2016
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
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dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628969
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)
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