Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21115701f&link_type=abstract
American Astronomical Society, AAS Meeting #211, #157.01
Astronomy and Astrophysics
Astronomy
Scientific paper
Supermassive black holes have played a fundamental role in the evolution of galaxies. It has been theorized that quasar-driven feedback at high redshift is at least partly responsible for the observed galaxy mass-black hole mass correlation. However, direct observations of the feedback are still lacking. Our observations on the extended nebulae around low-redshift quasars show that recent quasar-driven superwinds have drastically altered their environments. The superwind is capable of ejecting most of the interstellar medium, demonstrating a feedback mode that can efficiently regulate both star formation and black hole growth. Such superwinds provide local analogs of the quasar feedback hypothesized to have happened in the early universe. Studies of these objects thus can provide important insights into this key stage of galaxy evolution. We have discovered a strong preference of the superwinds towards quasars accreting low-metallicity gas. This finding not only has provided the first direct observational evidence that the gas from a merger can indeed be driven to the feeding distance of the central black hole, but has also validated the existence of low-metallicity quasars and placed a key constraint on quasar superwind models.
Fu Haixiang
Stockton Alan
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