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The search for Population III stars

Published online by Cambridge University Press:  01 June 2008

Sperello di Serego Alighieri ,
Jaron Kurk ,
Benedetta Ciardi ,
Andrea Cimatti ,
Emanuele Daddi  and
Andrea Ferrara
Sperello di Serego Alighieri
Affiliation:
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, Firenze, Italy email: [email protected]
Jaron Kurk
Affiliation:
Max Planck Institut für Astronomie. Königstuhl 17, Heidelberg, Germany
Benedetta Ciardi
Affiliation:
Max Planck Institut für Astrophysik, Karl Schwarzschild Str. 1, Garching, Germany
Andrea Cimatti
Affiliation:
Università di Bologna, Via Ranzani 1, Bologna, Italy
Emanuele Daddi
Affiliation:
CEA/Saclay, Gif sur Yvette, France
Andrea Ferrara
Affiliation:
SISSA, Via Beirut 4, Trieste, Italy
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Abstract

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Population III stars, the first generation of stars formed from primordial Big Bang material with a top–heavy IMF, should contribute substantially to the Universe reionization and they are crucial for understanding the early metal enrichment of galaxies. Therefore it is very important that these objects, foreseen by theories, are detected by observations. However PopIII stars, searched through the HeII 1640Å line signature, have remained elusive. We report about the search for the HeII line in a galaxy at z = 6.5, which is a very promising candidate. Unfortunately we are not yet able to show the results of this search. However we call attention to the possible detection of PopIII stars in a lensed HII dwarf galaxy at z = 3.4, which appeared in the literature some years ago, but has been overlooked.

Keywords

cosmology: observationgalaxies: formationstars: chemically peculiar
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 75 - 78
Copyright
Copyright © International Astronomical Union 2008

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