Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3

The Astrophysical Journal 800.1 (2015): 39 reproduced by permission of the AAS

Bibliographic Details
Authors: Guo, Y., Ferguson, H., Bell, E., Koo, D., Conselice, C. J., Giavalisco, M., Kassin, S., Lu, Y., Lucas, R., Mandelke, N., McIntosh, D., Primack, J., Ravindranath, S., Barro, G., Ceverino Rodríguez, Daniel, Dekel, A., Faber, S., Fang, J., Koekemoer, A., Noeske, K., Rafelski, M., Straughn, A.
Format: article
Publication Date:2015
Country:España
Institution:Universidad Autónoma de Madrid
Repository:Biblos-e Archivo. Repositorio Institucional de la UAM
Language:English
OAI Identifier:oai:repositorio.uam.es:10486/673443
Online Access:http://hdl.handle.net/10486/673443
https://dx.doi.org/10.1088/0004-637X/800/1/39
Access Level:Open access
Keyword:Galaxies: formation
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
Galaxies: starburst
Galaxies: structure
Física
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spelling Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3Guo, Y.Ferguson, H.Bell, E.Koo, D.Conselice, C. J.Giavalisco, M.Kassin, S.Lu, Y.Lucas, R.Mandelke, N.McIntosh, D.Primack, J.Ravindranath, S.Barro, G.Ceverino Rodríguez, DanielDekel, A.Faber, S.Fang, J.Koekemoer, A.Noeske, K.Rafelski, M.Straughn, A.Galaxies: formationGalaxies: evolutionGalaxies: irregularGalaxies: star formationGalaxies: starburstGalaxies: structureFísicaThe Astrophysical Journal 800.1 (2015): 39 reproduced by permission of the AASAlthough giant clumps of stars are thought to be crucial to galaxy formation and evolution, the most basic demographics of clumps are still uncertain, mainly because the definition of clumps has not been thoroughly discussed. In this paper, we carry out a study of the basic demographics of clumps in star-forming galaxies at 0.5 < z < 3, using our proposed physical definition that UV-bright clumps are discrete star-forming regions that individually contribute more than 8% of the rest-frame UV light of their galaxies. Clumps defined this way are significantly brighter than the H II regions of nearby large spiral galaxies, either individually or blended, when physical spatial resolution and cosmological dimming are considered. Under this definition, we measure the fraction of star-forming galaxies that have at least one off-center clump (f clumpy) and the contributions of clumps to the rest-frame UV light and star formation rate (SFR) of star-forming galaxies in the CANDELS/GOODS-S and UDS fields, where our mass-complete sample consists of 3239 galaxies with axial ratio q > 0.5. The redshift evolution of f clumpy changes with the stellar mass (M ∗) of the galaxies. Low-mass (log (M ∗/M ) < 9.8) galaxies keep an almost constant f clumpy of ∼60% from z ∼ 3 to z ∼ 0.5. Intermediate-mass and massive galaxies drop their f clumpy from 55% at z ∼ 3 to 40% and 15%, respectively, at z ∼ 0.5. We find that (1) the trend of disk stabilization predicted by violent disk instability matches the f clumpy trend of massive galaxies; (2) minor mergers are a viable explanation of the f clumpy trend of intermediate-mass galaxies at z < 1.5, given a realistic observability timescale; and (3) major mergers are unlikely responsible for the f clumpy trend in all masses at z < 1.5. The clump contribution to the rest-frame UV light of star-forming galaxies shows a broad peak around galaxies with log (M ∗/M ) ∼ 10.5 at all redshifts. The clump contribution in the intermediate-mass and massive galaxies is possibly linked to the molecular gas fraction of the galaxies. The clump contribution to the SFR of star-forming galaxies, generally around 4%-10%, also shows dependence on the galaxy M ∗, but for a given galaxy M ∗, its dependence on the redshift is mildWe thank the anonymous referee for constructive comments that improve this article. Support for Program number HST-GO-12060 and HST-GO-13309 were provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. We acknowledge partial support from NSF grant AST 08-08133. Facility: HST (ACS, WFC3)Departamento de Física TeóricaFacultad de Ciencias20152015-02-06research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/673443https://dx.doi.org/10.1088/0004-637X/800/1/39reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6734432026-06-23T12:46:27Z
dc.title.none.fl_str_mv Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
title Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
spellingShingle Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
Guo, Y.
Galaxies: formation
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
Galaxies: starburst
Galaxies: structure
Física
title_short Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
title_full Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
title_fullStr Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
title_full_unstemmed Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
title_sort Clumpy galaxies in candels. I. the definition of UV clumps and the fraction of clumpy galaxies at 0.5 <z< 3
dc.creator.none.fl_str_mv Guo, Y.
Ferguson, H.
Bell, E.
Koo, D.
Conselice, C. J.
Giavalisco, M.
Kassin, S.
Lu, Y.
Lucas, R.
Mandelke, N.
McIntosh, D.
Primack, J.
Ravindranath, S.
Barro, G.
Ceverino Rodríguez, Daniel
Dekel, A.
Faber, S.
Fang, J.
Koekemoer, A.
Noeske, K.
Rafelski, M.
Straughn, A.
author Guo, Y.
author_facet Guo, Y.
Ferguson, H.
Bell, E.
Koo, D.
Conselice, C. J.
Giavalisco, M.
Kassin, S.
Lu, Y.
Lucas, R.
Mandelke, N.
McIntosh, D.
Primack, J.
Ravindranath, S.
Barro, G.
Ceverino Rodríguez, Daniel
Dekel, A.
Faber, S.
Fang, J.
Koekemoer, A.
Noeske, K.
Rafelski, M.
Straughn, A.
author_role author
author2 Ferguson, H.
Bell, E.
Koo, D.
Conselice, C. J.
Giavalisco, M.
Kassin, S.
Lu, Y.
Lucas, R.
Mandelke, N.
McIntosh, D.
Primack, J.
Ravindranath, S.
Barro, G.
Ceverino Rodríguez, Daniel
Dekel, A.
Faber, S.
Fang, J.
Koekemoer, A.
Noeske, K.
Rafelski, M.
Straughn, A.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Galaxies: formation
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
Galaxies: starburst
Galaxies: structure
Física
topic Galaxies: formation
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
Galaxies: starburst
Galaxies: structure
Física
description The Astrophysical Journal 800.1 (2015): 39 reproduced by permission of the AAS
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-02-06
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/673443
https://dx.doi.org/10.1088/0004-637X/800/1/39
url http://hdl.handle.net/10486/673443
https://dx.doi.org/10.1088/0004-637X/800/1/39
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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