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2011MNRAS.416.1916V - Mon. Not. R. Astron. Soc., 416, 1916-1935 (2011/September-3)
The origin of the dust in high-redshift quasars: the case of SDSS J1148+5251.
VALIANTE R., SCHNEIDER R., SALVADORI S. and BIANCHI S.
Abstract (from CDS):
We use this model to study the case of SDSS J1148+5251 observed at redshift 6.4. We explore different star formation histories for the QSO host galaxy and find that Population III stars give a negligible contribution to the final metal and dust masses due to rapid enrichment of the ISM to metallicities >Zcr= 10–6–10–4 Z☉ in progenitor galaxies at redshifts >10. If Population II/I stars form with a standard initial mass function (IMF) and with a characteristic stellar mass of mch= 0.35 M☉, a final stellar mass of (1–5) {x} 1011 M☉ is required to reproduce the observed dust mass and gas metallicity of SDSS J1148+5251. This is a factor of 3–10 higher than the stellar mass inferred from observations and would shift the QSO closer or on to the stellar bulge–black hole relation observed in the local Universe; alternatively, the observed chemical properties can be reconciled with the inferred stellar mass, assuming that Population II/I stars form according to a top-heavy IMF with mch= 5 M☉. We find that SNe dominate the early dust enrichment and that, depending on the shape of the star formation history and on the stellar IMF, AGB stars contribute at z < 8–10. Yet, a dust mass of (2–6) {x} 108 M☉ estimated for SDSS J1148+5251 cannot be reproduced considering only stellar sources, and the final dust mass is dominated by grain growth in molecular clouds. This conclusion is independent of the stellar IMF and star formation history. GHASP: an Hα kinematic survey of spiral and irregular galaxies – IX. The near-infrared, stellar and baryonic Tully–Fisher relations
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): stars: AGB and post-AGB - supernovae: general - dust, extinction - galaxies: evolution - galaxies: high-redshift - quasars: general
Simbad objects: 6
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