An observational pursuit for Pop III stars in a Lyα emitter at z>6 through He II emission
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چکیده
منابع مشابه
An Observational Pursuit for Population III Stars in a Lyα Emitter at z=6.33 through Heii Emission
We present a very deep near-infrared spectroscopic observation of a strong Lyα emitter at z = 6.33, SDF J132440.6+273607, which we used to search for Heiiλ1640. This emission line is expected if the target hosts a significant number of population III stars. Even after 42 ksec of integration with the Subaru/OHS spectrograph, no emission-line features are detected in the JH band, which confirms t...
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We discuss the cosmological significance of the transition from the Pop III to Pop II mode of star formation in the early universe, and when and how it may occur in primordial galaxies. Observations that could detect this transition include those of element abundances in metal-poor Galactic halo stars, and of the helium reionization and associated heating of the intergalactic medium. We suggest...
متن کاملSearching for Pop III stars and galaxies at high redshift
We review the expected properties of Pop III and very metal-poor starburst and the behaviour the Lyα and He ii λ1640 emission lines, which are most likely the best/easiest signatures to single out such objects. Existing claims of Pop III signatures in distant galaxies are critically examined, and the searches for He ii λ1640 emission at high redshift are summarised. Finally, we briefly summaris...
متن کاملTHE DISCOVERY OF A LARGE Lyα+He II NEBULA AT z ≈ 1.67: A CANDIDATE LOW METALLICITY REGION?
We have discovered a ≈45 kpc Lyα nebula (or Lyα “blob”) at z ≈ 1.67 which exhibits strong, spatially-extended He ii emission and very weak C iv and C iii] emission. This is the first spatiallyextended Lyα+He ii emitter observed and the lowest redshift Lyα blob yet found. Strong Lyα and He iiλ1640 emission in the absence of metal lines has been proposed as a unique observational signature of pri...
متن کاملEvolving Spectra of Pop III Stars: Consequences for Cosmological Reionization
We examine the significance of the first metal-free stars (Pop III) for the cosmological reionization of H I and He II. These stars have unusually hard spectra, with the integrated ionizing photon rates from a Pop III stellar cluster for H I and He II being 1.6 and 10 times stronger respectively than those from a Pop II cluster. For the currently favored cosmology, we find that Pop III stars al...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2006
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921307010381