Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715702k&link_type=abstract
American Astronomical Society Meeting 207, #157.02; Bulletin of the American Astronomical Society, Vol. 37, p.1417
Astronomy and Astrophysics
Astrophysics
Scientific paper
Sub-and millimeter observations of the galaxy J1148+5251 located at redshift z = 6.42 indicate an infrared luminosity of LIR ≈ 2× 1013 L&sun;, and dust masses of Md ≈ 5× 108 M&sun;. Formed in the ejecta of supernovae, the inferred dust mass suggests a supernova rate of at least 1 yr-1 over the lifetime (≈ 300 Myr) of this object. The infrared luminosity, if powered by stars, suggest a current star formation rate of about 1000 M&sun; yr-1. Since supernova also destroy dust during the remnant phase of their evolution, the presence of such large quantity of dust may require unusual astrophysical scenarios for its formation and evolution. In this presentation we will discuss: (1) the implication of these observations for the formation, destruction, and evolution of dust in this extreme astrophysical environment; and (2) what powers the infrared emission: stars or the underlying AGN?
Dwek Eli
Galliano Frederic
Kasimova Ekaterina
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