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interests / talk.origins / Pop III stars.

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o Pop III stars.erik simpson

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Pop III stars.

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From: eastside...@gmail.com (erik simpson)
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Subject: Pop III stars.
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 by: erik simpson - Thu, 7 Mar 2024 18:27 UTC

JWST-JADES. Possible Population III signatures at z=10.6 in the halo of
GN-z11

Roberto Maiolino, Hannah Uebler, Michele Perna, Jan Scholtz, Francesco
D'Eugenio, Callum Witten, Nicolas Laporte, Joris Witstok, Stefano
Carniani, Sandro Tacchella, William Baker, Santiago Arribas, Kimihiko
Nakajima, Daniel Eisenstein, Andrew Bunker, Stephane Charlot, Giovanni
Cresci, Mirko Curti, Emma Curtis-Lake, Anna de Graaff, Zhiyuan Ji,
Benjamin D. Johnson, Nimisha Kumari, Tobias J. Looser, Michael Maseda,
Brant Robertson, Bruno Rodriguez Del Pino, Lester Sandles, Charlotte
Simmonds, Renske Smit, Fengwu Sun, Giacomo Venturi, Christina Williams,
Christopher Willmer

Finding the first generation of stars formed out of pristine gas in
the early Universe, known as Population III (PopIII) stars, is one of
the most important goals of modern astrophysics. Recent models suggest
that PopIII stars may form in pockets of pristine gas in the halo of
more evolved galaxies. Here we present NIRSpec-IFU and NIRSpec-MSA
observations of the region around GN-z11, an exceptionally luminous
galaxy at z=10.6, which reveal a >5σ detection of a feature consistent
with being HeIIλ1640 emission at the redshift of GN-z11. The very high
equivalent width of the putative HeII emission in this clump (170 A),
and the lack of metal lines, can be explained in terms of
photoionisation by PopIII stars, while photoionisation by PopII stars is
inconsistent with the data. It would also indicate that the putative
PopIII stars likely have a top-heavy initial mass function (IMF), with
an upper cutoff reaching at least 500 M⊙. The PopIII bolometric
luminosity inferred from the HeII line would be ∼2×1010 L⊙, which (with
a top-heavy IMF) would imply a total stellar mass formed in the burst of
∼6×105 M⊙. We find that photoionisation by the Active Galactic Nucleus
(AGN) in GN-z11 cannot account for the HeII luminosity observed in the
clump, but can potentially be responsible for additional HeII emission
observed closer to GN-z11. We also consider the possibility of in-situ
photoionisation by an accreting Direct Collapse Black Hole (DCBH) hosted
by the HeII clump; we find that this scenario is less favoured, but it
remains a possible alternative interpretation. We also report the
detection of a Lyα halo stemming out of GN-z11 and extending out to ∼2
kpc, as well as resolved, funnel-shaped CIII] emission, likely tracing
the ionisation cone of the AGN.

https://arxiv.org/abs/2306.00953

interests / talk.origins / Pop III stars.

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