2013MNRAS.435.1443M

Query : 2013MNRAS.435.1443M

2013MNRAS.435.1443M - Mon. Not. R. Astron. Soc., 435, 1443-1450 (2013/October-3)

Simulating extremely metal-poor gas and DLA metal content at redshift z ≃ 7.

MAIO U., CIARDI B. and MULLER V.

Abstract (from CDS):

We present the first theoretical study of metals in damped-Lyα (DLA) systems at redshift z ≃ 7. The features of cold, primordial gas are studied by means of N-body, hydro, chemistry simulations, including atomic and molecular non-equilibrium chemistry, cooling, star formation for Population III and Population II-I regimes, stellar evolution, cosmic metal spreading according to proper yields (for He, C, O, Si, Fe, Mg, S, etc.) and lifetimes and feedback effects. Theoretical expectations are then compared to recently available constraints from DLA observations.

We find that DLA galaxies at z ≃ 7 account for ∼ 10 percent of the whole galaxy population and for most of the metal-poor galaxies at these epochs. About 7 percent of these DLA galaxies contain purely pristine material and ∼ 34 percent of them consist of very weakly polluted gas, being, therefore, suitable candidates as Population III sites. The remaining ∼ 59 percent are enriched above ∼ 10–4Z☉. Additionally, DLA candidates appear to have: gas masses ≲ 2x108M☉; very low star formation rate, ∼ 10^- 3–10- 2^M☉/yr (significantly weaker than late-time counterparts); mean molecular fractions covering a fairly wide range, xmol ∼ 10^- 3–10- 6^; typical metallicities Z ≲ 10–3Z☉ and Hi column densities N_H I\gtrsim 3×10^20  cm^-2 (in agreement with recent observations). They present no or weak correlations between their gas mass and Z, N_H I, or xmol; a moderate correlation between xmol and Z, linked to the ongoing molecular-driven star formation and metal pollution processes; a mild anticorrelation between N_H I and xmol, due to H depletion into molecules; and a chemical content that is subject to environmental dependences.


Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: formation - intergalactic medium - galaxies: ISM - cosmology: theory - dark ages, reionization, first stars - early Universe

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO J1120+0641 QSO 11 20 01.463 +06 41 23.79           ~ 262 0

Query : 2013MNRAS.435.1443M

Basic data :
QSO J1120+0641 -- Quasar
Other object types: otypes_help 		QSO (2011Natur,QSO,...), MIR (WISE)
ICRS coord. (ep=J2000) : 		11 20 01.463 +06 41 23.79 (mm) [ 20 30 90 ] C 2020ApJ...904..130V
FK4 coord. (ep=B1950 eq=1950) : 		11 17 26.280 +06 57 49.77 [ 20 30 90 ]
Gal coord. (ep=J2000) : 		252.047510 +60.188058 [ 20 30 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 290758 [150] / z(spectroscopic) 7.0851 [0.0005] / cz 2124060 [150]
   (NIR) C 2021ApJ...923..262Y
Fluxes (3) :
J (AB) 20.36 [0.05] C 2016ApJS..227...11B
H (AB) 20.156 [0.0636] C 2020MNRAS.494..789R
K (AB) 19.613 [0.0526] C 2020MNRAS.494..789R
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Identifiers (4) :
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QSO J1120+0641 ULAS J112001.48+064124.3 WISE J112001.47+064124.2 [YWF2021] J112001.48+064124.3

References (262 between 1850 and 2026) (Total 262)
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Data at NED - NASA/IPAC Extragalactic Database : QSO J1120+0641

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ULAS J112001.48+064124.3 WISE J112001.47+064124.2

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