Population III stars: hidden or disappeared?

By Luca Tornatore, A. Ferrara, R. Schneider. 2007

209 citations recorded by the source corpus.

ABSTRACT A Pop III/Pop II transition from massive to normal stars is predicted to occur whenthe metallicity of the star forming gas crosses the critical range Z cr = 10 −5±1 Z ⊙ . Toinvestigate the cosmic implications of such process we use numerical simulations whichfollow the evolution, metal enrichment and energy deposition of both Pop III and PopII stars. We find that: (i) due to inefficient heavy element transport by outflows andslow ”genetic” transmission during hierarchical growth, large fluctuations around theaverage metallicity arise; as a result Pop III star formation continues down to z = 2.5,but at a low peak rate of 10 −5 M ⊙ yr 1 Mpc −3 occurring at z ≈6 (about 10 −4 of thePop II one); (ii) Pop III star formation proceeds in a ”inside-out” mode in whichformation sites are progressively confined at the periphery of collapsed structures,where the low gas density and correspondingly long free-fall timescales result in a veryinefficient astration. These conclusions strongly encourage deep searches for pristinestar formation sites at moderate (2 < z < 5) redshifts where metal free stars are likelyto be hidden.Key words: galaxies: formation - cosmology: theory - cosmology: observations -intergalactic medium

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3bac102b1d2f106f4ce4fcb5100fdaaf77eb50d6

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In Astronomy and Astrophysics

1. John H. Wise
2. Tom Abel
3. S. Khochfar
4. Volker Bromm
5. Claudio Dalla Vecchia
6. M. Norman
7. Jarrett L. Johnson
8. A. Ferrara

In Instrumentation

1. S. Khochfar
2. Claudio Dalla Vecchia
3. John H. Wise
4. Tom Abel
5. M. Norman
6. Volker Bromm
7. A. Ferrara
8. M. Trenti

Citations in the corpus

• The transition from population III to population II-I star formation (2010, methodology): “Our findings are consistent with the study of theZcrit = 10−4Z⊙ case by Tornatore et al. (2007).”
• The First Stars: Mass Growth Under Protostellar Feedback (2011, background): “…provided the early metal enrichment of the intergalactic medium (IGM; Madau et al. 2001; Mori et al. 2002; Bromm et al. 2003; Wada & Venkatesan 2003; Norman et al. 2004; Tornatore et al. 2007; Greif et al. 2007, 2010; Wise & Abel 2008; Maio et al. 2011; recently reviewed in Karlsson et al. 2011).”
• Formation of Supermassive Black Hole Seeds (2016, background): “The metal enrichment is expected to be patchy in the early universe and therefore some halos may remain unpolluted even down to z= 6 (Tornatore et al. 2007; Trenti et al. 2009; Maio et al. 2011; Ritter et al. 2015; Pallottini et al. 2014; Habouzit et al. 2016a).”
• FORMATION RATES OF POPULATION III STARS AND CHEMICAL ENRICHMENT OF HALOS DURING THE REIONIZATION ERA (2009, background): “…star formation rate and the nature of the transition from Population III star formed in minihalos to Population III stars formed in Tvir ≈ 104 halos and from Population III to Population II (Mackey et al. 2003; Furlanetto & Loeb 2005; Greif & Bromm 2006; Smith et al. 2009; Tornatore et al. 2007).”
• The First Billion Years project: the impact of stellar radiation on the co-evolution of Populations II and III (2012, methodology): “We follow the prescription for metal enrichment presented in Wiersma et al. (2009a), which is similar to that also employed by Tornatore et al. (2007b).”
• THE BIRTH OF A GALAXY: PRIMORDIAL METAL ENRICHMENT AND STELLAR POPULATIONS (2010, methodology): “…al. 2007; Komiya et al. 2010), (iii) post-processing of cosmological simulations with blastwave models (Karlsson et al. 2008; Trenti et al. 2009; Trenti & Shull 2010), and (iv) direct numerical simulations with stellar feedback (Tornatore et al. 2007; Ricotti et al. 2008; Maio et al. 2010, 2011).”
• EVIDENCE FOR PopIII-LIKE STELLAR POPULATIONS IN THE MOST LUMINOUS Lyα EMITTERS AT THE EPOCH OF REIONIZATION: SPECTROSCOPIC CONFIRMATION (2015, background): “…the presence of a young, metal-free population, forming for example in a yet un-polluted region of the galaxy, in an slightly evolved galaxy at z = 6.6, could reproduce the observed features of CR7 (consistent with theoretical predictions from e.g. Scannapieco et al. 2003; Tornatore et al. 2007).”
• The first stars: formation of binaries and small multiple systems (2009, background): “…E-mail: minerva@astro.as.utexas.edu supernovae (SNe) they spread heavy elements through the IGM, thereby providing the initial cosmic metal enrichment (e.g. Madau et al. 2001; Mori et al. 2002; Bromm et al. 2003; Wada & Venkatesan 2003; Norman et al. 2004; Greif et al. 2007; Tornatore et al. 2007).”
• Building up the Population III initial mass function from cosmological initial conditions (2016, background): “…same massive Pop III stars also left behind the first metal-enriched SN remnants (e.g. Mori et al. 2002; Bromm et al. 2003; Wada & Venkatesan 2003; Norman et al. 2004; Tornatore et al. 2007; Greif et al. 2007, 2010; Wise et al. 2012; Maio et al. 2011; recently reviewed in Karlsson et al. 2013).”