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This thesis focuses on understanding the growth and formation
mechanism of supermassive black holes (SMBHs), an issue it
addresses by investigating the dense interstellar medium that is
assumed to be a crucial component of the fuel for SMBHs. The thesis
also offers unique guidance on using the Atacama Large
Millimeter/submillimeter Array (ALMA) in active galactic nuclei
(AGN) research. The author presents the three major findings
regarding SMBH formation and growth: (1) The development of a new
diagnostic method for the energy sources in galaxies based on
submillimeter spectroscopy, which allows identification of
accreting SMBHs even in obscured environments, (2) the discovery
that the circumnuclear dense gas disk (CND), with a typical size of
a few tens of parsecs, which plays a crucial role in governing the
growth of SMBHs, and (3) the discovery that the mass transfer
budget from the CND to the central SMBHs can be quantitatively
understood with a theoretical model incorporating the circumnuclear
starburst as a driver of mass transfer. The thesis skillfully
reviews these three findings, which have greatly improved our
understanding of the growth mechanism of SMBHs.
This thesis focuses on understanding the growth and formation
mechanism of supermassive black holes (SMBHs), an issue it
addresses by investigating the dense interstellar medium that is
assumed to be a crucial component of the fuel for SMBHs. The thesis
also offers unique guidance on using the Atacama Large
Millimeter/submillimeter Array (ALMA) in active galactic nuclei
(AGN) research. The author presents the three major findings
regarding SMBH formation and growth: (1) The development of a new
diagnostic method for the energy sources in galaxies based on
submillimeter spectroscopy, which allows identification of
accreting SMBHs even in obscured environments, (2) the discovery
that the circumnuclear dense gas disk (CND), with a typical size of
a few tens of parsecs, which plays a crucial role in governing the
growth of SMBHs, and (3) the discovery that the mass transfer
budget from the CND to the central SMBHs can be quantitatively
understood with a theoretical model incorporating the circumnuclear
starburst as a driver of mass transfer. The thesis skillfully
reviews these three findings, which have greatly improved our
understanding of the growth mechanism of SMBHs.
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