Dust grain growth in the interstellar medium of 5 < z < 6.5 quasars

被引：93

作者：

Michalowski, M. J. ^{[1
]}

Murphy, E. J. ^{[2
]}

Hjorth, J. ^{[3
]}

Watson, D. ^{[3
]}

Gall, C. ^{[3
]}

Dunlop, J. S. ^{[1
,4
]}

机构：

[1] Univ Edinburgh, Royal Observ, Inst Astron, Scottish Univ Phys Alliance, Edinburgh EH9 3HJ, Midlothian, Scotland

[2] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[3] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen O, Denmark

[4] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 522卷

基金：

新加坡国家研究基金会;

关键词：

dust; extinction; galaxies: high-redshift; galaxies: ISM; submillimeter: galaxies; quasars: general; KEPLERS SUPERNOVA REMNANT; SPITZER-SPACE-TELESCOPE; UNIVERSE GALAXY SURVEY; HIGH-REDSHIFT QUASARS; SPECTRAL ENERGY-DISTRIBUTION; LARGE-MAGELLANIC-CLOUD; MOLECULAR GAS; HOST GALAXY; COLD DUST; SUBMILLIMETER GALAXIES;

D O I：

10.1051/0004-6361/201014902

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We investigate whether stellar dust sources i.e. asymptotic giant branch (AGB) stars and supernovae (SNe) can account for dust detected in 5 < z < 6.5 quasars (QSOs). Methods. We calculate the required dust yields per AGB star and per SN using the dust masses of QSOs inferred from their millimeter emission and stellar masses approximated as the difference between the dynamical and the H-2 gas masses of these objects. Results. We find that AGB stars are not efficient enough to form dust in the majority of the z > 5 QSOs, whereas SNe may be able to account for dust in some QSOs. However, they require very high dust yields even for a top-heavy initial mass function. Conclusions. This suggests additional non-stellar dust formation mechanism e.g. significant dust grain growth in the interstellar medium of at least three out of nine z > 5 QSOs. SNe (but not AGB stars) may deliver enough heavy elements to fuel this growth.

引用

页数：5

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Dust grain growth in the interstellar medium of 5 &lt; z &lt; 6.5 quasars

Dust grain growth in the interstellar medium of 5 < z < 6.5 quasars