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Primordial star clusters at extreme magnification
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
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2015 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 449, no 3, 3057-3063 p.Article in journal (Refereed) Published
Abstract [en]

Gravitationally lensed galaxies with magnification mu approximate to 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 mu similar to 1000 may none the less be relevant in the case of intrinsically small, high-redshift objects with very high number densities. Here, we explore the prospects of detecting compact (less than or similar to 10 pc), high-redshift (z greater than or similar to 7) Population III star clusters at such extreme magnifications in large-area surveys with planned telescopes like Euclid, Wide Field Infrared Survey Telescope and Wide-field Imaging Surveyor for High-redshift (WISH). We find that the planned WISH 100 deg(2) ultradeep survey may be able to detect a small number of such objects, provided that the total stellar mass of these star clusters is greater than or similar to 10(4) M-circle dot. If candidates for such lensed Population III star clusters are found, follow-up spectroscopy of the surrounding nebula with the James Webb Space Telescope or ground-based Extremely Large Telescopes should be able to confirm the Population III nature of these objects. Multiband photometry of these objects with the James Webb Space Telescope also has the potential to confirm that the stellar initial mass function in these Population III star clusters is top-heavy, as supported by current simulations.

Place, publisher, year, edition, pages
2015. Vol. 449, no 3, 3057-3063 p.
Keyword [en]
gravitational lensing: strong, stars: Population III, galaxies: high-redshift, dark ages, reionization, first stars
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-257026DOI: 10.1093/mnras/stv492ISI: 000355337800066OAI: oai:DiVA.org:uu-257026DiVA: diva2:827915
Available from: 2015-06-29 Created: 2015-06-29 Last updated: 2015-06-29Bibliographically approved

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Zackrisson, Erik
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