Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies

Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We observed the Milky Way satellite candidate Vir Z, reported by Walsh et al. (2009, A...

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Detalles Bibliográficos
Autores: Barbuy, Beatriz, Bica, Eduardo Luiz Damiani, Ortolani, Sergio, Souza, André Lopes de
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Brasil
Institución:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/109478
Acceso en línea:http://hdl.handle.net/10183/109478
Access Level:acceso abierto
Palabra clave:Aglomerados de galaxias
Galaxia
Galaxy: general
Galaxies: groups: individual: Virgo Z
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spelling 2015-01-30T02:18:03Z20130004-6361http://hdl.handle.net/10183/109478000948907Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We observed the Milky Way satellite candidate Vir Z, reported by Walsh et al. (2009, AJ, 137, 450), from the detection of an overdensity in the SDSS database. Methods. Deep subarcsec seeing images from the New Technology Telescope (NTT) and Galileo telescopes were obtained in order to infer the nature of the proposed overdensity. Results. The image and colour-magnitude diagram of the Vir Z field shows no dwarf galaxy. Instead, we identified a compact group of galaxies near the center of the Vir Z field at redshift z ≈ 0.3 ± 0.2, based on the apparent magnitudes of the brightest galaxies assuming L = L∗, and on angular sizes of the spirals assuming physical sizes equal to M31.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 559 (Nov. 2013), A61, 4 p.Aglomerados de galaxiasGalaxiaGalaxy: generalGalaxies: groups: individual: Virgo ZDeep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxiesEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSBarbuy, BeatrizBica, Eduardo Luiz DamianiOrtolani, SergioSouza, André Lopes deORIGINAL000948907.pdf000948907.pdfTexto completo (inglês)application/pdf314506http://www.lume.ufrgs.br/bitstream/10183/109478/1/000948907.pdf6a3c0c4270e4beb644baa44b19d765a1MD51TEXT000948907.pdf.txt000948907.pdf.txtExtracted Texttext/plain19574http://www.lume.ufrgs.br/bitstream/10183/109478/2/000948907.pdf.txt5142b581992834c2085da0fdaf7acf90MD52THUMBNAIL000948907.pdf.jpg000948907.pdf.jpgGenerated Thumbnailimage/jpeg2023http://www.lume.ufrgs.br/bitstream/10183/109478/3/000948907.pdf.jpg0b9f6600817815f5e19569cea708d3a2MD5310183/1094782023-10-25 03:38:58.600462oai:www.lume.ufrgs.br:10183/109478Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2023-10-25T06:38:58Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
title Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
spellingShingle Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
Barbuy, Beatriz
Aglomerados de galaxias
Galaxia
Galaxy: general
Galaxies: groups: individual: Virgo Z
title_short Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
title_full Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
title_fullStr Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
title_full_unstemmed Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
title_sort Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
dc.creator.none.fl_str_mv Barbuy, Beatriz
Bica, Eduardo Luiz Damiani
Ortolani, Sergio
Souza, André Lopes de
author Barbuy, Beatriz
author_facet Barbuy, Beatriz
Bica, Eduardo Luiz Damiani
Ortolani, Sergio
Souza, André Lopes de
author_role author
author2 Bica, Eduardo Luiz Damiani
Ortolani, Sergio
Souza, André Lopes de
author2_role author
author
author
dc.subject.por.fl_str_mv Aglomerados de galaxias
Galaxia
topic Aglomerados de galaxias
Galaxia
Galaxy: general
Galaxies: groups: individual: Virgo Z
dc.subject.eng.fl_str_mv Galaxy: general
Galaxies: groups: individual: Virgo Z
description Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We observed the Milky Way satellite candidate Vir Z, reported by Walsh et al. (2009, AJ, 137, 450), from the detection of an overdensity in the SDSS database. Methods. Deep subarcsec seeing images from the New Technology Telescope (NTT) and Galileo telescopes were obtained in order to infer the nature of the proposed overdensity. Results. The image and colour-magnitude diagram of the Vir Z field shows no dwarf galaxy. Instead, we identified a compact group of galaxies near the center of the Vir Z field at redshift z ≈ 0.3 ± 0.2, based on the apparent magnitudes of the brightest galaxies assuming L = L∗, and on angular sizes of the spirals assuming physical sizes equal to M31.
publishDate 2013
dc.date.issued.fl_str_mv 2013
dc.date.accessioned.fl_str_mv 2015-01-30T02:18:03Z
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/109478
dc.identifier.issn.pt_BR.fl_str_mv 0004-6361
dc.identifier.nrb.pt_BR.fl_str_mv 000948907
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000948907
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Astronomy and astrophysics. Les Ulis. Vol. 559 (Nov. 2013), A61, 4 p.
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