Two fossil groups of galaxies at z≈ 0.4 in the Cosmic Evolution Survey: accelerated stellar‐mass build‐up, different progenitors
Identifieur interne : 000003 ( France/Analysis ); précédent : 000002; suivant : 000004Two fossil groups of galaxies at z≈ 0.4 in the Cosmic Evolution Survey: accelerated stellar‐mass build‐up, different progenitors
Auteurs : D. Pierini [Allemagne] ; S. Giodini [Pays-Bas] ; A. Finoguenov [Allemagne] ; H. Böhringer [Allemagne] ; E. D Nghia [États-Unis] ; G. W. Pratt [France] ; J. Démoclès [France] ; M. Pannella [France] ; S. Zibetti [Danemark] ; F. G. Braglia [Canada] ; M. Verdugo [Allemagne] ; F. Ziparo [Allemagne] ; A. M. Koekemoer [États-Unis] ; M. Salvato [Allemagne, États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-11-11.
English descriptors
- KwdEn :
Abstract
We report on two fossil groups of galaxies at redshifts z= 0.425 and 0.372 discovered in the Cosmic Evolution Survey (COSMOS) area. Selected as X‐ray extended sources, they have total masses (M200) equal to 1.9(±0.41) × 1013 and 9.5(±0.42) × 1013 M⊙, respectively, as obtained from a recent X‐ray luminosity–mass scaling relation. The lower mass system appears isolated, whereas the other sits in a well‐known large‐scale structure (LSS) populated by 27 other X‐ray emitting groups. The identification as fossil is based on the i‐band photometry of all the galaxies with a photometric redshift consistent with that of the group at the 2σ confidence level and within a projected groupcentric distance equal to 0.5R200, and iAB≤ 22.5 mag limited spectroscopy. Both fossil groups exhibit high stellar‐to‐total mass ratios compared to all the X‐ray selected groups of similar mass at 0.3 ≤z≤ 0.5 in the COSMOS. At variance with the composite galaxy stellar mass functions (GSMFs) of similarly massive systems, both fossil group GSMFs are dominated by passively evolving galaxies down to Mstars∼ 1010 M⊙ (according to the galaxy broad‐band spectral energy distributions). The relative lack of star‐forming galaxies with 1010≤Mstars≤ 1011 M⊙ is confirmed by the galaxy distribution in the b−r versus i colour–magnitude diagram. Hence, the two fossil groups appear as more mature than the coeval, similarly massive groups. Their overall star formation activity ended rapidly after an accelerated build up of the total stellar mass; no significant infall of galaxies with Mstars≥ 1010 M⊙ took place in the last 3 to 6 Gyr. This similarity holds although the two fossil groups are embedded in two very different density environments of the LSS, which suggests that their galaxy populations were shaped by processes that do not depend on the LSS. However, their progenitors may do so. We discuss why the late merging of a compact group is favoured over the early assembly as a formation scenario for the isolated, low‐mass fossil group.
Url:
DOI: 10.1111/j.1365-2966.2011.19454.x
Affiliations:
- Allemagne, Canada, Danemark, France, Pays-Bas, États-Unis
- Bavière, District de Haute-Bavière, Île-de-France
- Garching bei München, Gif‐sur‐Yvette
Links toward previous steps (curation, corpus...)
- to stream Main, to step Corpus: 000915
- to stream Main, to step Curation: 000915
- to stream Main, to step Exploration: 000026
- to stream France, to step Extraction: 000003
Links to Exploration step
ISTEX:6D1BCA436B653B097F6212C9EFF904ED0FA01201Le document en format XML
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Pannella</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire AIM, DAPNIA/Service d’Astrophysique, CEA/DSM, CNRS, Université Paris Diderot, Bât. 709, CEA‐Saclay, F‐91191 Gif‐sur‐Yvette Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Gif‐sur‐Yvette</settlement></placeName></affiliation></author><author><name sortKey="Zibetti, S" sort="Zibetti, S" uniqKey="Zibetti S" first="S." last="Zibetti">S. Zibetti</name><affiliation wicri:level="1"><country xml:lang="fr">Danemark</country><wicri:regionArea>Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø</wicri:regionArea><wicri:noRegion>2100 Copenhagen Ø</wicri:noRegion></affiliation></author><author><name sortKey="Braglia, F G" sort="Braglia, F G" uniqKey="Braglia F" first="F. G." last="Braglia">F. G. Braglia</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1</wicri:regionArea><wicri:noRegion>BC V6T 1Z1</wicri:noRegion></affiliation></author><author><name sortKey="Verdugo, M" sort="Verdugo, M" uniqKey="Verdugo M" first="M." last="Verdugo">M. Verdugo</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Max‐Planck‐Institut für extraterrestrische Physik, Giessenbachstrasse, D‐85748 Garching bei München</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Garching bei München</settlement></placeName></affiliation></author><author><name sortKey="Ziparo, F" sort="Ziparo, F" uniqKey="Ziparo F" first="F." last="Ziparo">F. Ziparo</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Max‐Planck‐Institut für extraterrestrische Physik, Giessenbachstrasse, D‐85748 Garching bei München</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Garching bei München</settlement></placeName></affiliation></author><author><name sortKey="Koekemoer, A M" sort="Koekemoer, A M" uniqKey="Koekemoer A" first="A. M." last="Koekemoer">A. M. Koekemoer</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218</wicri:regionArea><wicri:noRegion>MD 21218</wicri:noRegion></affiliation></author><author><name sortKey="Salvato, M" sort="Salvato, M" uniqKey="Salvato M" first="M." last="Salvato">M. 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Selected as X‐ray extended sources, they have total masses (M200) equal to 1.9(±0.41) × 1013 and 9.5(±0.42) × 1013 M⊙, respectively, as obtained from a recent X‐ray luminosity–mass scaling relation. The lower mass system appears isolated, whereas the other sits in a well‐known large‐scale structure (LSS) populated by 27 other X‐ray emitting groups. The identification as fossil is based on the i‐band photometry of all the galaxies with a photometric redshift consistent with that of the group at the 2σ confidence level and within a projected groupcentric distance equal to 0.5R200, and iAB≤ 22.5 mag limited spectroscopy. Both fossil groups exhibit high stellar‐to‐total mass ratios compared to all the X‐ray selected groups of similar mass at 0.3 ≤z≤ 0.5 in the COSMOS. At variance with the composite galaxy stellar mass functions (GSMFs) of similarly massive systems, both fossil group GSMFs are dominated by passively evolving galaxies down to Mstars∼ 1010 M⊙ (according to the galaxy broad‐band spectral energy distributions). The relative lack of star‐forming galaxies with 1010≤Mstars≤ 1011 M⊙ is confirmed by the galaxy distribution in the b−r versus i colour–magnitude diagram. Hence, the two fossil groups appear as more mature than the coeval, similarly massive groups. Their overall star formation activity ended rapidly after an accelerated build up of the total stellar mass; no significant infall of galaxies with Mstars≥ 1010 M⊙ took place in the last 3 to 6 Gyr. This similarity holds although the two fossil groups are embedded in two very different density environments of the LSS, which suggests that their galaxy populations were shaped by processes that do not depend on the LSS. However, their progenitors may do so. We discuss why the late merging of a compact group is favoured over the early assembly as a formation scenario for the isolated, low‐mass fossil group.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Canada</li><li>Danemark</li><li>France</li><li>Pays-Bas</li><li>États-Unis</li></country><region><li>Bavière</li><li>District de Haute-Bavière</li><li>Île-de-France</li></region><settlement><li>Garching bei München</li><li>Gif‐sur‐Yvette</li></settlement></list><tree><country name="Allemagne"><region name="Bavière"><name sortKey="Pierini, D" sort="Pierini, D" uniqKey="Pierini D" first="D." last="Pierini">D. Pierini</name></region><name sortKey="Bohringer, H" sort="Bohringer, H" uniqKey="Bohringer H" first="H." last="Böhringer">H. Böhringer</name><name sortKey="Finoguenov, A" sort="Finoguenov, A" uniqKey="Finoguenov A" first="A." last="Finoguenov">A. Finoguenov</name><name sortKey="Pierini, D" sort="Pierini, D" uniqKey="Pierini D" first="D." last="Pierini">D. Pierini</name><name sortKey="Salvato, M" sort="Salvato, M" uniqKey="Salvato M" first="M." last="Salvato">M. Salvato</name><name sortKey="Salvato, M" sort="Salvato, M" uniqKey="Salvato M" first="M." last="Salvato">M. Salvato</name><name sortKey="Verdugo, M" sort="Verdugo, M" uniqKey="Verdugo M" first="M." last="Verdugo">M. Verdugo</name><name sortKey="Ziparo, F" sort="Ziparo, F" uniqKey="Ziparo F" first="F." last="Ziparo">F. Ziparo</name></country><country name="Pays-Bas"><noRegion><name sortKey="Giodini, S" sort="Giodini, S" uniqKey="Giodini S" first="S." last="Giodini">S. Giodini</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="D Nghia, E" sort="D Nghia, E" uniqKey="D Nghia E" first="E." last="D Nghia">E. D Nghia</name></noRegion><name sortKey="Koekemoer, A M" sort="Koekemoer, A M" uniqKey="Koekemoer A" first="A. M." last="Koekemoer">A. M. Koekemoer</name><name sortKey="Salvato, M" sort="Salvato, M" uniqKey="Salvato M" first="M." last="Salvato">M. Salvato</name></country><country name="France"><region name="Île-de-France"><name sortKey="Pratt, G W" sort="Pratt, G W" uniqKey="Pratt G" first="G. W." last="Pratt">G. W. Pratt</name></region><name sortKey="Democles, J" sort="Democles, J" uniqKey="Democles J" first="J." last="Démoclès">J. Démoclès</name><name sortKey="Pannella, M" sort="Pannella, M" uniqKey="Pannella M" first="M." last="Pannella">M. Pannella</name></country><country name="Danemark"><noRegion><name sortKey="Zibetti, S" sort="Zibetti, S" uniqKey="Zibetti S" first="S." last="Zibetti">S. Zibetti</name></noRegion></country><country name="Canada"><noRegion><name sortKey="Braglia, F G" sort="Braglia, F G" uniqKey="Braglia F" first="F. G." last="Braglia">F. G. Braglia</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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