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A Search for Population III Galaxies in CLASH. I. Singly-imaged Candidates at High Redshift

Rydberg, Claes-Erik and Zackrisson, Erik and Zitrin, Adi and Guaita, Lucia and Melinder, Jens and Asadi, Saghar and Gonzalez, Juan and Östlin, Göran and Ström, Tina (2015) A Search for Population III Galaxies in CLASH. I. Singly-imaged Candidates at High Redshift. Astrophysical Journal, 804 (1). Art. No. 13. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150605-133327263

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Abstract

Population III (Pop III) galaxies are predicted to exist at high redshifts and may be rendered sufficiently bright for detection with current telescopes when gravitationally lensed by a foreground galaxy cluster. Pop III galaxies that exhibit strong Lyα emission should furthermore be identifiable from broadband photometry because of their unusual colors. Here, we report on a search for such objects at z ≳ 6 in the imaging data from the Cluster Lensing And Supernova survey with Hubble (CLASH), covering 25 galaxy clusters in 16 filters. Our selection algorithm returns five singly imaged candidates with Lyα-like color signatures, for which ground-based spectroscopy with current 8–10 m class telescopes should be able to test the predicted strength of the Lyα line. None of these five objects have been included in previous CLASH compilations of high-redshift galaxy candidates. However, when large grids of spectral synthesis models are applied to the study of these objects, we find that only two of these candidates are significantly better fitted by Pop III models than by more mundane, low-metallicity stellar populations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/804/1/13DOIArticle
http://iopscience.iop.org/0004-637X/804/1/13PublisherArticle
http://arxiv.org/abs/1411.5691arXivDiscussion Paper
ORCID:
AuthorORCID
Zitrin, Adi0000-0002-0350-4488
Additional Information:© 2015 American Astronomical Society. Received 2014 November 26; accepted 2015 February 5; published 2015 April 24. C. E. R. acknowledges funding from the Swedish National Space Board and the Royal Swedish Academy of Sciences. E. Z. acknowledges funding from the Swedish National Space Board and the Swedish Research Council (Project 2011–5349). E. Z. and J. G. acknowledge funding from the Wenner-Gren foundations. Support for A. Z. was provided by NASA through Hubble Fellowship grant #HST-HF2–51334.001 A awarded by STScI.
Funders:
Funding AgencyGrant Number
Swedish National Space Board (SNSB)UNSPECIFIED
Royal Swedish Academy of SciencesUNSPECIFIED
Swedish Research CouncilProject 2011–5349
Wenner-Gren FoundationUNSPECIFIED
NASA Hubble FellowshipHST-HF2–51334.001 A
Subject Keywords: dark ages, reionization, first stars; galaxies: high-redshift; gravitational lensing: strong; stars: Population III
Issue or Number:1
Record Number:CaltechAUTHORS:20150605-133327263
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150605-133327263
Official Citation:A Search for Population III Galaxies in CLASH. I. Singly-imaged Candidates at High Redshift Claes-Erik Rydberg et al. 2015 ApJ 804 13
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58052
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Jun 2015 00:02
Last Modified:03 Oct 2019 08:31

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