Kavli Affiliate: Luis C. Ho
| First 5 Authors: Yue-Chang Peng, Jian-Min Wang, Yu Zhao, Luis C. Ho,
| Summary:
There is growing evidence for star formation inside outflows of active
galactic nuclei (AGNs). The formed stars are injected into bulges and give rise
to perturbation of bulges. In this paper, we investigate the issues of
non-rotating, spherically symmetric bulges under the perturbation of fast,
massive outflows with stars formed inside. We show that the potential
perturbation of outflows together with injection and dynamical friction of
these stars could drive bulge oscillations. Still, we find non-zero radial
velocity of bulges will be driven by the episodic outflows of AGNs and after
the AGN quenched, the radial velocity will tend to zero within a timescale
$simtau_{rm AGN}$, which is the AGN’s lifetime. For some typical values of
bulges and AGNs, we find the expansion and contraction velocities are of a few
$10,rm km,s^{-1}$ for $10^{10},M_odot$ bulges and mass outflowing rate
$500,M_odot/rm yr$, which would give observational signatures.
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