The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/109045 |
Resumo: | The morphological properties of high-redshift galaxies are investigated using a sample of 507 objects (I < 22.0 mag) from the Hubble Space Telescope (HST) Medium Deep Survey. Independent visual mor phological classifications for each galaxy are used to quantify the statistical uncertainties in the galaxy classifications. Visual classifications are found to agree well for I < 21 mag. Fainter than I = 21 mag significant disagreements are seen in the independent visual classifications of late-type systems with T > 7, merging systems, and peculiar galaxies. The classifications of these systems are shown to be somewhat subjective. Objective classifications based upon measurements of central concentration and asymmetry for the Medium Deep Survey sample are presented. These classifications are calibrated using measurements of structural parameters for an artificially redshifted sample of local objects. Morphologically segregated number counts using both sets of visual classifications and objective classifications support the conclusion that the observed galaxy counts agree with no-evolution predictions for the elliptical and spiral populations, as reported in Glazebrook et al. (1995a). A major conclusion is that the large overdensity of merging/peculiar/irregular galaxies relative to the predictions of no-evolution models (reported by Glazebrook et al. 1995a) is confirmed. However, the shape of the faint-end (J > 21.0 mag) number count relation for peculiar objects is sensitive to the large systematic uncertainties inherent in the visual classification of these objects. Despite this caveat, the frequency of objects showing clear evi dence for tidal interactions (e.g., tidal tails) in the HST sample is at least 50% larger than it is among nearby galaxies, at the 2 σ level. Relatively few "chain galaxies" are seen among the sample of peculiar objects, suggesting that these systems do not form a large component of the peculiar galaxy population at I< 22 mag. |
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Abraham, Roberto G.Bergh, Sidney van denGlazebrook, KarlEllis, Richard S.Santiago, Basilio XavierSurma, PeterGriffiths, Richard E.2015-01-20T02:15:10Z19960067-0049http://hdl.handle.net/10183/109045000210985The morphological properties of high-redshift galaxies are investigated using a sample of 507 objects (I < 22.0 mag) from the Hubble Space Telescope (HST) Medium Deep Survey. Independent visual mor phological classifications for each galaxy are used to quantify the statistical uncertainties in the galaxy classifications. Visual classifications are found to agree well for I < 21 mag. Fainter than I = 21 mag significant disagreements are seen in the independent visual classifications of late-type systems with T > 7, merging systems, and peculiar galaxies. The classifications of these systems are shown to be somewhat subjective. Objective classifications based upon measurements of central concentration and asymmetry for the Medium Deep Survey sample are presented. These classifications are calibrated using measurements of structural parameters for an artificially redshifted sample of local objects. Morphologically segregated number counts using both sets of visual classifications and objective classifications support the conclusion that the observed galaxy counts agree with no-evolution predictions for the elliptical and spiral populations, as reported in Glazebrook et al. (1995a). A major conclusion is that the large overdensity of merging/peculiar/irregular galaxies relative to the predictions of no-evolution models (reported by Glazebrook et al. 1995a) is confirmed. However, the shape of the faint-end (J > 21.0 mag) number count relation for peculiar objects is sensitive to the large systematic uncertainties inherent in the visual classification of these objects. Despite this caveat, the frequency of objects showing clear evi dence for tidal interactions (e.g., tidal tails) in the HST sample is at least 50% larger than it is among nearby galaxies, at the 2 σ level. Relatively few "chain galaxies" are seen among the sample of peculiar objects, suggesting that these systems do not form a large component of the peculiar galaxy population at I< 22 mag.application/pdfengThe Astrophysical journal. Supplement series. Chicago. Vol. 107, no. 1 (Nov. 1996), p. 1-17GaláxiasGalaxies: evolutionGalaxies: fundamental parametersGalaxies: interactionsSurveysThe morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep surveyEstrangeiroinfo: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:UFRGSORIGINAL000210985.pdf000210985.pdfTexto completo (inglês)application/pdf3409999http://www.lume.ufrgs.br/bitstream/10183/109045/1/000210985.pdfd461261eabf6251bc59792c4dd297300MD51TEXT000210985.pdf.txt000210985.pdf.txtExtracted Texttext/plain484http://www.lume.ufrgs.br/bitstream/10183/109045/2/000210985.pdf.txt76bee751aa87e1610450e01914a2ed11MD52THUMBNAIL000210985.pdf.jpg000210985.pdf.jpgGenerated Thumbnailimage/jpeg2169http://www.lume.ufrgs.br/bitstream/10183/109045/3/000210985.pdf.jpg21f946a3256ddbc4970c2669a8f2657aMD5310183/1090452023-07-04 03:49:44.529806oai:www.lume.ufrgs.br:10183/109045Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-04T06:49:44Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
title |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
spellingShingle |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey Abraham, Roberto G. Galáxias Galaxies: evolution Galaxies: fundamental parameters Galaxies: interactions Surveys |
title_short |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
title_full |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
title_fullStr |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
title_full_unstemmed |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
title_sort |
The morphologies of distant galaxies. II. Classifications from the Hubble Space Telescope medium deep survey |
author |
Abraham, Roberto G. |
author_facet |
Abraham, Roberto G. Bergh, Sidney van den Glazebrook, Karl Ellis, Richard S. Santiago, Basilio Xavier Surma, Peter Griffiths, Richard E. |
author_role |
author |
author2 |
Bergh, Sidney van den Glazebrook, Karl Ellis, Richard S. Santiago, Basilio Xavier Surma, Peter Griffiths, Richard E. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Abraham, Roberto G. Bergh, Sidney van den Glazebrook, Karl Ellis, Richard S. Santiago, Basilio Xavier Surma, Peter Griffiths, Richard E. |
dc.subject.por.fl_str_mv |
Galáxias |
topic |
Galáxias Galaxies: evolution Galaxies: fundamental parameters Galaxies: interactions Surveys |
dc.subject.eng.fl_str_mv |
Galaxies: evolution Galaxies: fundamental parameters Galaxies: interactions Surveys |
description |
The morphological properties of high-redshift galaxies are investigated using a sample of 507 objects (I < 22.0 mag) from the Hubble Space Telescope (HST) Medium Deep Survey. Independent visual mor phological classifications for each galaxy are used to quantify the statistical uncertainties in the galaxy classifications. Visual classifications are found to agree well for I < 21 mag. Fainter than I = 21 mag significant disagreements are seen in the independent visual classifications of late-type systems with T > 7, merging systems, and peculiar galaxies. The classifications of these systems are shown to be somewhat subjective. Objective classifications based upon measurements of central concentration and asymmetry for the Medium Deep Survey sample are presented. These classifications are calibrated using measurements of structural parameters for an artificially redshifted sample of local objects. Morphologically segregated number counts using both sets of visual classifications and objective classifications support the conclusion that the observed galaxy counts agree with no-evolution predictions for the elliptical and spiral populations, as reported in Glazebrook et al. (1995a). A major conclusion is that the large overdensity of merging/peculiar/irregular galaxies relative to the predictions of no-evolution models (reported by Glazebrook et al. 1995a) is confirmed. However, the shape of the faint-end (J > 21.0 mag) number count relation for peculiar objects is sensitive to the large systematic uncertainties inherent in the visual classification of these objects. Despite this caveat, the frequency of objects showing clear evi dence for tidal interactions (e.g., tidal tails) in the HST sample is at least 50% larger than it is among nearby galaxies, at the 2 σ level. Relatively few "chain galaxies" are seen among the sample of peculiar objects, suggesting that these systems do not form a large component of the peculiar galaxy population at I< 22 mag. |
publishDate |
1996 |
dc.date.issued.fl_str_mv |
1996 |
dc.date.accessioned.fl_str_mv |
2015-01-20T02:15:10Z |
dc.type.driver.fl_str_mv |
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publishedVersion |
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0067-0049 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000210985 |
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http://hdl.handle.net/10183/109045 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astrophysical journal. Supplement series. Chicago. Vol. 107, no. 1 (Nov. 1996), p. 1-17 |
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openAccess |
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