15,557 research outputs found
Universal transition diagram from dormant to actively accreting supermassive black holes
The vast majority of supermassive black holes (SMBHs) in the local universe
exhibit levels of activity much lower than those expected from gas supplying
rates onto the galactic nuclei, and only a small fraction of silent SMBHs can
turn into active galactic nuclei. Revisiting observational data of very nearby
SMBHs whose gravitational spheres of influence are spatially reached by the
Chandra X-ray satellite, we find that the level of BH activity drastically
increases from the quiescent phase when the inflow rate outside of the BH
influence radius is higher than 0.1% of the Eddington accretion rate. We also
show that the relation between the nuclear luminosity and gas accretion rate
from the BH influence radius measured from X-ray observations is well described
by the universal state transition of accreting SMBHs, as predicted by recent
hydrodynamical simulations with radiative cooling and BH feedback. After the
state transition, young massive stars should form naturally in the nucleus, as
observed in the case of the nearest SMBH, Sagittarius A, which is
currently quiescent but was recently active.Comment: 9 pages (main text), 2 figures, 1 table, accepted for publication in
Ap
Izergin-Korepin analysis on the projected wavefunctions of the generalized free-fermion model
We apply the Izergin-Korepin analysis to the study of the projected
wavefunctions of the generalized free-fermion model. We introduce a
generalization of the -operator of the six-vertex model by
Bump-Brubaker-Friedberg and Bump-McNamara-Nakasuji. We make the Izergin-Korepin
analysis to characterize the projected wavefunctions and show that they can be
expressed as a product of factors and certain symmetric functions which
generalizes the factorial Schur functions. This result can be seen as a
generalization of the Tokuyama formula for the factorial Schur functions.Comment: 18 pages, 3 figure
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