Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization?
Aims. Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring...
| Autores: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/44772 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/44772 |
| Access Level: | acceso abierto |
| Palabra clave: | 52 Lyman-break galaxies Origins deep survey Goods-south field J-band search Redshift 6 Cosmic variance 1st galaxies Emitters Emission Z-similar-to-9 Astrofísica Astronomía (Física) |
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Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization?Clément, B.Cuby, J. G.Courbin, F.Fontana, A.Freudling, W.Fynbo, J.Gallego Maestro, JesúsHibon, P.Kneib, J. P.Le Fèvre, O.Lidman, C.McMahon, R.Milvang-Jensen, B.Moller, P.Moorwood, A.Nilsson, K. K.Pentericci, L.Venemans, B.Villar, V.Willis, J.52Lyman-break galaxiesOrigins deep surveyGoods-south fieldJ-band searchRedshift 6Cosmic variance1st galaxiesEmittersEmissionZ-similar-to-9AstrofísicaAstronomía (Física)Aims. Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Lyα luminosity function (LF) of Lyα emitters at redshift z = 7.7 therefore allows us to constrain the ionizing state of the Universe at this redshift. Methods. We observed three 7. 5 × 7. 5 fields with the HAWK-I instrument at the VLT with a narrow band filter centred at 1.06 μm and targeting Lyα emitters at redshift z ∼ 7.7. The fields were chosen for the availability of multiwavelength data. One field is a galaxy cluster, the Bullet Cluster, which allowed us to use gravitational amplification to probe luminosities that are fainter than in the field. The two other fields are subareas of the GOODS Chandra Deep Field South and CFHTLS-D4 deep field. We selected z = 7.7 LAE candidates from a variety of colour criteria, in particular from the absence of detection in the optical bands. Results. We do not find any LAE candidates at z = 7.7 in ∼2.4 × 104 Mpc3 down to a narrow band AB magnitude of ∼26, which allows us to infer robust constraints on the Lyα LAE luminosity function at this redshift. Conclusions. The predicted mean number of objects at z = 6.5, derived from somewhat different luminosity functions of Hu et al. (2010, ApJ, 725, 394), Ouchi et al. (2010, ApJ, 723, 869), and Kashikawa et al. (2011, ApJ, 734, 119) are 2.5, 13.7, and 11.6, respectively. Depending on which of these luminosity functions we refer to, we exclude a scenario with no evolution from z = 6.5 to z = 7.7 at 85% confidence without requiring a strong change in the IGM Lyα transmission, or at 99% confidence with a significant quenching of the IGM Lyα transmission, possibly from a strong increase in the high neutral-hydrogen fraction between these two redshifts.EDP ScienciesUniversidad Complutense de Madrid20122012-02-0120122012-02-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44772reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/447722026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| title |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| spellingShingle |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? Clément, B. 52 Lyman-break galaxies Origins deep survey Goods-south field J-band search Redshift 6 Cosmic variance 1st galaxies Emitters Emission Z-similar-to-9 Astrofísica Astronomía (Física) |
| title_short |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| title_full |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| title_fullStr |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| title_full_unstemmed |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| title_sort |
Evolution of the observed Lyα luminosity function from z=6.5 to z=7.7: evidence for the epoch of reionization? |
| dc.creator.none.fl_str_mv |
Clément, B. Cuby, J. G. Courbin, F. Fontana, A. Freudling, W. Fynbo, J. Gallego Maestro, Jesús Hibon, P. Kneib, J. P. Le Fèvre, O. Lidman, C. McMahon, R. Milvang-Jensen, B. Moller, P. Moorwood, A. Nilsson, K. K. Pentericci, L. Venemans, B. Villar, V. Willis, J. |
| author |
Clément, B. |
| author_facet |
Clément, B. Cuby, J. G. Courbin, F. Fontana, A. Freudling, W. Fynbo, J. Gallego Maestro, Jesús Hibon, P. Kneib, J. P. Le Fèvre, O. Lidman, C. McMahon, R. Milvang-Jensen, B. Moller, P. Moorwood, A. Nilsson, K. K. Pentericci, L. Venemans, B. Villar, V. Willis, J. |
| author_role |
author |
| author2 |
Cuby, J. G. Courbin, F. Fontana, A. Freudling, W. Fynbo, J. Gallego Maestro, Jesús Hibon, P. Kneib, J. P. Le Fèvre, O. Lidman, C. McMahon, R. Milvang-Jensen, B. Moller, P. Moorwood, A. Nilsson, K. K. Pentericci, L. Venemans, B. Villar, V. Willis, J. |
| author2_role |
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 |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Lyman-break galaxies Origins deep survey Goods-south field J-band search Redshift 6 Cosmic variance 1st galaxies Emitters Emission Z-similar-to-9 Astrofísica Astronomía (Física) |
| topic |
52 Lyman-break galaxies Origins deep survey Goods-south field J-band search Redshift 6 Cosmic variance 1st galaxies Emitters Emission Z-similar-to-9 Astrofísica Astronomía (Física) |
| description |
Aims. Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Lyα luminosity function (LF) of Lyα emitters at redshift z = 7.7 therefore allows us to constrain the ionizing state of the Universe at this redshift. Methods. We observed three 7. 5 × 7. 5 fields with the HAWK-I instrument at the VLT with a narrow band filter centred at 1.06 μm and targeting Lyα emitters at redshift z ∼ 7.7. The fields were chosen for the availability of multiwavelength data. One field is a galaxy cluster, the Bullet Cluster, which allowed us to use gravitational amplification to probe luminosities that are fainter than in the field. The two other fields are subareas of the GOODS Chandra Deep Field South and CFHTLS-D4 deep field. We selected z = 7.7 LAE candidates from a variety of colour criteria, in particular from the absence of detection in the optical bands. Results. We do not find any LAE candidates at z = 7.7 in ∼2.4 × 104 Mpc3 down to a narrow band AB magnitude of ∼26, which allows us to infer robust constraints on the Lyα LAE luminosity function at this redshift. Conclusions. The predicted mean number of objects at z = 6.5, derived from somewhat different luminosity functions of Hu et al. (2010, ApJ, 725, 394), Ouchi et al. (2010, ApJ, 723, 869), and Kashikawa et al. (2011, ApJ, 734, 119) are 2.5, 13.7, and 11.6, respectively. Depending on which of these luminosity functions we refer to, we exclude a scenario with no evolution from z = 6.5 to z = 7.7 at 85% confidence without requiring a strong change in the IGM Lyα transmission, or at 99% confidence with a significant quenching of the IGM Lyα transmission, possibly from a strong increase in the high neutral-hydrogen fraction between these two redshifts. |
| publishDate |
2012 |
| dc.date.none.fl_str_mv |
2012 2012-02-01 2012 2012-02-01 |
| 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/20.500.14352/44772 |
| url |
https://hdl.handle.net/20.500.14352/44772 |
| dc.language.none.fl_str_mv |
Inglés eng |
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Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 |
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openAccess |
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application/pdf |
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EDP Sciencies |
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EDP Sciencies |
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reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
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Universidad Complutense de Madrid (UCM) |
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Docta Complutense |
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