Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies
Aims. Recent work has shown that major mergers of disc galaxies can only account for ~20% of the growth of the galaxy red sequence between z = 1 and z = 0. Our goal here is to provide merger frequencies that encompass both major and minor mergers, derived from close pair statistics. We aim to show t...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/44782 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/44782 |
| Access Level: | acceso abierto |
| Palabra clave: | 52 Star-forming galaxies Digital-sky-survey Similar-to 1 Merger rate evolution Extended groth strip Ultra-deep-field Elliptic galaxies High-redshift Gas-rich Disk galaxies Astrofísica Astronomía (Física) |
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Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxiesLópez Sanjuan, C.Balcells, M.Pérez González, Pablo GuillermoBarro, GuillermoGallego Maestro, JesúsZamorano Calvo, Jaime52Star-forming galaxiesDigital-sky-surveySimilar-to 1Merger rate evolutionExtended groth stripUltra-deep-fieldElliptic galaxiesHigh-redshiftGas-richDisk galaxiesAstrofísicaAstronomía (Física)Aims. Recent work has shown that major mergers of disc galaxies can only account for ~20% of the growth of the galaxy red sequence between z = 1 and z = 0. Our goal here is to provide merger frequencies that encompass both major and minor mergers, derived from close pair statistics. We aim to show that reliable close pair statistics can be derived from galaxy catalogues with mixed spectroscopic and photometric redshifts. Methods. We use B-band luminosity- and mass-limited samples from a Spitzer/IRAC-selected catalogue of GOODS-S. We present a new methodology for computing the number of close companions, , when spectroscopic redshift information is partial. The methodology extends the one used in spectroscopic surveys to make use of photometric redshift information. We select as close companions those galaxies separated by 6 h-1 kpc < rp < 21 h-1 kpc in the sky plane and with a difference Δ v ≤ 500 km s-1 in redshift space. Results. We provide for four different B-band-selected samples. It increases with luminosity, in good agreement with previous estimations from spectroscopic surveys. The evolution of with redshift is faster in more luminous samples. We provide of ≥ 1010 galaxies, finding that the number including minor companions (, mass ratio μ ≥ 1/10) is roughly two times the number of major companions alone (, mass ratio μ ≥ 1/3) in the range 0.2 ≤ z < 1.1. We compare the major merger rate derived by close pairs with the one computed by morphological criteria, finding that both approaches provide similar merger rates for field galaxies when the progenitor bias is taken into account. Finally, we estimate that the total (major+minor) merger rate is ~1.7 times the major merger rate. Conclusions. Only 30% to 50% of the ≥ 1010 early-type (E/S0/Sa) galaxies that appear between z = 1 and z = 0 may have undergone a major or a minor merger. Half of the red sequence growth since z = 1 is therefore unrelated to mergers.EDP ScienciesUniversidad Complutense de Madrid20102010-07-0120102010-07-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44782reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/447822026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| title |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| spellingShingle |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies López Sanjuan, C. 52 Star-forming galaxies Digital-sky-survey Similar-to 1 Merger rate evolution Extended groth strip Ultra-deep-field Elliptic galaxies High-redshift Gas-rich Disk galaxies Astrofísica Astronomía (Física) |
| title_short |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| title_full |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| title_fullStr |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| title_full_unstemmed |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| title_sort |
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies |
| dc.creator.none.fl_str_mv |
López Sanjuan, C. Balcells, M. Pérez González, Pablo Guillermo Barro, Guillermo Gallego Maestro, Jesús Zamorano Calvo, Jaime |
| author |
López Sanjuan, C. |
| author_facet |
López Sanjuan, C. Balcells, M. Pérez González, Pablo Guillermo Barro, Guillermo Gallego Maestro, Jesús Zamorano Calvo, Jaime |
| author_role |
author |
| author2 |
Balcells, M. Pérez González, Pablo Guillermo Barro, Guillermo Gallego Maestro, Jesús Zamorano Calvo, Jaime |
| author2_role |
author author author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Star-forming galaxies Digital-sky-survey Similar-to 1 Merger rate evolution Extended groth strip Ultra-deep-field Elliptic galaxies High-redshift Gas-rich Disk galaxies Astrofísica Astronomía (Física) |
| topic |
52 Star-forming galaxies Digital-sky-survey Similar-to 1 Merger rate evolution Extended groth strip Ultra-deep-field Elliptic galaxies High-redshift Gas-rich Disk galaxies Astrofísica Astronomía (Física) |
| description |
Aims. Recent work has shown that major mergers of disc galaxies can only account for ~20% of the growth of the galaxy red sequence between z = 1 and z = 0. Our goal here is to provide merger frequencies that encompass both major and minor mergers, derived from close pair statistics. We aim to show that reliable close pair statistics can be derived from galaxy catalogues with mixed spectroscopic and photometric redshifts. Methods. We use B-band luminosity- and mass-limited samples from a Spitzer/IRAC-selected catalogue of GOODS-S. We present a new methodology for computing the number of close companions, , when spectroscopic redshift information is partial. The methodology extends the one used in spectroscopic surveys to make use of photometric redshift information. We select as close companions those galaxies separated by 6 h-1 kpc < rp < 21 h-1 kpc in the sky plane and with a difference Δ v ≤ 500 km s-1 in redshift space. Results. We provide for four different B-band-selected samples. It increases with luminosity, in good agreement with previous estimations from spectroscopic surveys. The evolution of with redshift is faster in more luminous samples. We provide of ≥ 1010 galaxies, finding that the number including minor companions (, mass ratio μ ≥ 1/10) is roughly two times the number of major companions alone (, mass ratio μ ≥ 1/3) in the range 0.2 ≤ z < 1.1. We compare the major merger rate derived by close pairs with the one computed by morphological criteria, finding that both approaches provide similar merger rates for field galaxies when the progenitor bias is taken into account. Finally, we estimate that the total (major+minor) merger rate is ~1.7 times the major merger rate. Conclusions. Only 30% to 50% of the ≥ 1010 early-type (E/S0/Sa) galaxies that appear between z = 1 and z = 0 may have undergone a major or a minor merger. Half of the red sequence growth since z = 1 is therefore unrelated to mergers. |
| publishDate |
2010 |
| dc.date.none.fl_str_mv |
2010 2010-07-01 2010 2010-07-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/44782 |
| url |
https://hdl.handle.net/20.500.14352/44782 |
| 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.publisher.none.fl_str_mv |
EDP Sciencies |
| publisher.none.fl_str_mv |
EDP Sciencies |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
| collection |
Docta Complutense |
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1869415729274552320 |
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15,300719 |