A search for population iii galaxies in clash. I. singly imaged candidates at high redshift

Claes Erik Rydberg, Erik Zackrisson, Adi Zitrin, Lucia Guaita, Jens Melinder, Saghar Asadi, Juan Gonzalez, Goran Ostlin, Tina Strom

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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 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.

Original languageEnglish
Article number13
JournalAstrophysical Journal
Issue number1
StatePublished - 1 May 2015
Externally publishedYes


  • dark ages, reionization, first stars
  • galaxies: high-redshift
  • gravitational lensing: strong
  • stars: Population III

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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