Primordial star clusters at extreme magnification
Erik Zackrisson, Juan Gonzalez, Simon Eriksson, Saghar Asadi, Chalence, Safranek-Shrader, Michele Trenti, Akio K. Inoue

TL;DR
This paper investigates the potential to detect extremely magnified, small Population III star clusters at high redshifts using upcoming large-area surveys and telescopes, highlighting their detectability and scientific importance.
Contribution
It demonstrates that planned surveys like WISH could detect Population III star clusters with high magnification, and discusses follow-up methods to confirm their nature and properties.
Findings
WISH survey may detect a few Population III star clusters.
Follow-up spectroscopy can confirm their Population III nature.
Photometry can reveal a top-heavy initial mass function.
Abstract
Gravitationally lensed galaxies with magnification ~10-100 are routinely detected at high redshifts, but magnifications significantly higher than this are hampered by a combination of low probability and large source sizes. Magnifications of ~1000 may nonetheless be relevant in the case of intrinsically small, high-redshift objects with very high number densities. Here, we explore the prospects of detecting compact (< 10 pc), high-redshift (z > 7) Population III star clusters at such extreme magnifications in large-area surveys with planned telescopes like Euclid, WFIRST and WISH. We find that the planned WISH 100 sq. deg ultradeep survey may be able to detect a small number of such objects, provided that the total stellar mass of these star clusters is > 10000 solar masses. If candidates for such lensed Population III star clusters are found, follow-up spectroscopy of the surrounding…
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