The search for Population III stars

Alighieri, S. di Serego; Kurk, J.; Ciardi, B.; Cimatti, A.; Daddi, Emanuele; Ferrara, Andrea

doi:10.1017/s1743921308024605

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Recently, many authors (Shapley et al 2003, Nagao et al 2008, di Serego Alighieri et al 2008 have searched for the HeII 1640 Å emission line in the spectra of the so-called dual emitters, i.e. high-z galaxies showing strong emission in both Lyα and HeII lines.…”

Section: Light From Pop III Starsmentioning

confidence: 99%

Simulating high-redshift galaxies

Salvaterra

Ferrara

Dayal

2011

Monthly Notices of the Royal Astronomical Society

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153

171

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Recent observations have gathered a considerable sample of high redshift galaxy candidates and determined the evolution of their luminosity function (LF). To interpret these findings, we use cosmological SPH simulations including, in addition to standard physical processes, a detailed treatment of the Pop III-Pop II transition in early objects. The simulated high-z galaxies match remarkably well the amplitude and slope of the observed LF in the redshift range 59.4) start of their star formation activity; the specific star formation rate is almost independent of galactic stellar mass. These objects are enriched rapidly with metals and galaxies identified by HST/WFC3 (M_UV < -18) show metallicities ~0.1 Zsun even at z=7-8. Most of the simulated galaxies at z~7 (noticeably the smallest ones) are virtually dust-free, and none of them has an extinction larger than E(B-V) = 0.01. The bulk (50%) of the ionizing photons is produced by objects populating the faint-end of the LF (M_UV < -16), which JWST will resolve up to z=7.3. PopIII stars continue to form essentially at all redshifts; however, at z=6 (z=10) the contribution of Pop III stars to the total galactic luminosity is always less than 5% for M_UV < -17 (M_UV < -16). The typical high-z galaxies closely resemble the GRB host galaxy population observed at lower redshifts, strongly encouraging the use of GRBs to detect the first galaxies.Comment: 14 pages, 10 figures, MNRAS in pres

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Section: Light From Pop III Starsmentioning

confidence: 99%

Simulating high-redshift galaxies

Salvaterra

Ferrara

Dayal

2011

Monthly Notices of the Royal Astronomical Society

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153

171

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“…Pop III-like signatures of this type have already been reported for galaxies at low to intermediate redshifts (e.g. Malhotra & Rhoads 2002;Fosbury et al 2003;di Serego Alighieri et al 2008;Inoue et al 2011;Cassata et al 2013), but the nature of these objects remain unclear, as they are all too bright to be easily reconciled with the Pop III objects seen in current simulations. Unfortunately, many of these diagnostics become increasingly difficult to use at higher redshifts, where most pure Pop III galaxies are expected to exist (Zackrisson et al 2012).…”

Section: Introductionmentioning

confidence: 71%

A Search for Population Iii Galaxies in Clash. I. Singly Imaged Candidates at High Redshift

Rydberg

Zackrisson

Zitrin

et al. 2015

ApJ

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Population III galaxies are predicted to exist at high redshifts and may be rendered sufficiently bright for detection with current telescopes when gravitationally lensed by a foreground galaxy cluster. Population III galaxies that exhibit strong Lyα emission should furthermore be identifiable from broadband photometry because of their unusual colors. Here, we report on a search for such objects at z 6 in the imaging data from the Cluster Lensing And Supernova survey with Hubble (CLASH), covering 25 galaxy clusters in 16 filters. Our selection algorithm returns five singly-imaged candidates with Lyα-like color signatures, for which ground-based spectroscopy with current 8-10 m class telescopes should be able to test the predicted strength of the Lyα line. None of these five objects have been included in previous CLASH compilations of high-redshift galaxy candidates. However, when large grids of spectral synthesis models are applied to the study of these objects, we find that only two of these candidates are significantly better fitted by Population III models than by more mundane, low-metallicity stellar populations.

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“…The difficulty in interpreting high-z emission line spectra is clearly demonstrated by the case of CR7 (Sobral et al 2015). Initially thought to be the first definitely Pop III-like galaxy ever observed (though for earlier claims see, e.g., Malhotra & Rhoads 2002;di Serego Alighieri et al 2008), this bright z = 6.6 Lyman-α emitter has provided a critical test of our ability to discriminate between theoretical interpretations of high-z galaxy observations. In the following, we begin with a focused overview of the rapid developments and lessons learned in studying CR7, before discussing alternative means to either directly or indirectly probe the formation and growth of black holes in the early Universe.…”

Section: Observations Past and Futurementioning

confidence: 99%

Titans of the early Universe: The Prato statement on the origin of the first supermassive black holes

Woods

Agarwal²,

Bromm

et al. 2019

Publ. Astron. Soc. Aust.

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157

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In recent years, the discovery of massive quasars at $z\sim7$ has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early Universe. Mounting observational and theoretical evidence indicates the viability of massive seeds, formed by the collapse of supermassive stars, as a progenitor model for such early, massive accreting black holes. Although considerable progress has been made in our theoretical understanding, many questions remain regarding how (and how often) such objects may form, how they live and die, and how next generation observatories may yield new insight into the origin of these primordial titans. This review focusses on our present understanding of this remarkable formation scenario, based on the discussions held at the Monash Prato Centre from November 20 to 24, 2017, during the workshop ‘Titans of the Early Universe: The Origin of the First Supermassive Black Holes’.

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The search for Population III stars

Cited by 5 publications

References 17 publications

Simulating high-redshift galaxies

Simulating high-redshift galaxies

A Search for Population Iii Galaxies in Clash. I. Singly Imaged Candidates at High Redshift

Titans of the early Universe: The Prato statement on the origin of the first supermassive black holes

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