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Predicting the observability of population III stars with ELT-HARMONI via the helium 1640 Å emission line
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2021.03.02
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Predicting the observability of population III stars with ELT-HARMONI via the helium 1640 Å emission line

Authors: Kearn GrisdaleNiranjan ThatteJulien DevriendtMiguel Pereira-SantaellaAdrianne SlyzTaysun KimmYohan DuboisSukyoung K. Yi


Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 4, p5517-5537


Population III (Pop. III) stars, as of yet, have not been detected, however as we move into the era of extremely large telescopes this is likely to change. One likely tracer for Pop. III stars is the HeIIλ1640 emission line, which will be detectable by the HARMONI spectrograph on the European Extremely Large Telescope (ELT) over a broad range of redshifts (2z14). By post-processing galaxies from the cosmological, AMR-hydrodynamical simulation NewHorizon with theoretical spectral energy distributions (SED) for Pop. III stars and radiative transfer (i.e. the Yggdrasil Models and CLOUDY look-up tables respectively) we are able to compute the flux of HeIIλ1640 for individual galaxies. From mock 10 hour observations of these galaxies we show that HARMONI will be able to detect Pop. III stars in galaxies up to z10 provided Pop. III stars have a top heavy Initial Mass Function (IMF). Furthermore, we find that should Pop. III stars instead have an IMF similar to those of the Pop. I stars, the HeIIλ1640 line would only be observable for galaxies with Pop. III stellar masses in excess of 107Myr1, average stellar age <1Myr at z=4. Finally, we are able to determine the minimal intrinsic flux required for HARMONI to detect Pop. III stars in a galaxy up to z=10.

https://ui.adsabs.harvard.edu/abs/2021MNRAS.501.5517G/abstract

저자명
Taysun Kimm, Sukyoung Yi