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A multiply imaged z similar to 6.3 Lyman a emitter candidate behind Abell 2261
Heidelberg Univ, Zentrum Astron, Inst Theoret Astrophys, Albert Ueberly Str 2, D-69120 Heidelberg, Germany.;Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova, SE-10691 Stockholm, Sweden..
CALTECH, Cahill Ctr Astron & Astrophys, MS 249-17, Pasadena, CA 91125 USA.;Ben Gurion Univ Negev, Dept Phys, POB 653, IL-84105 Beer Sheva, Israel..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova, SE-10691 Stockholm, Sweden..
Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova, SE-10691 Stockholm, Sweden..
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 467, no 1, 768-777 p.Article in journal (Refereed) Published
Abstract [en]

While the Lyman alpha (Ly alpha) emission line serves as an important tool in the study of galaxies at z less than or similar to 6, finding Ly a emitters (LAE) at significantly higher redshifts has been more challenging, probably because of the increasing neutrality of the intergalactic medium above z similar to 6. Galaxies with extremely high rest-frame Ly alpha equivalent widths, EW(Ly alpha) greater than or similar to 150 A degrees, at z > 6, are good candidates for Ly alpha follow-up observations, and can stand out in multiband imaging surveys because of their unusual colours. We have conducted a photometric search for such objects in the Cluster Lensing And Supernova survey with Hubble (CLASH), and report here the identification of three likely gravitationally lensed images of a single LAE candidate at z-6.3, behind the galaxy cluster Abell 2261 (z=0.225). In the process, we also measured with Keck/Multi-Object Spectrometer For Infra-Red Exploration the first spectroscopic redshift of a multiply imaged galaxy behind Abell 2261, at z=3.337. This allows us to calibrate the lensing model, which, in turn, is used to study the properties of the candidate LAE. Population III galaxy spectral energy distribution model fits to the CLASH broad-band photometry of the possible LAE provide a slightly better fit than Population I/II models. The best-fitting model suggests intrinsic EW(Ly alpha) approximate to 160 A degrees after absorption in the interstellar and intergalactic medium. Future spectroscopic observations will examine this prediction as well as shed more light on the morphology of this object, which indicates that it may be a merger of two smaller galaxies.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2017. Vol. 467, no 1, 768-777 p.
Keyword [en]
gravitational lensing: strong, stars: Population III, galaxies: clusters: individual: Abell 2261, galaxies: high-redshift, cosmology: observations, dark ages, reionization, first stars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-321792DOI: 10.1093/mnras/stx157ISI: 000398418900053OAI: oai:DiVA.org:uu-321792DiVA: diva2:1094784
Funder
Swedish National Space BoardThe Royal Swedish Academy of SciencesEU, European Research Council, 339177Swedish Research Council, 2011-5349German Research Foundation (DFG)Wenner-Gren Foundations
Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-05-11Bibliographically approved

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