Bibcode
del Moral-Castro, I.; García-Lorenzo, B.; Ramos Almeida, C.; Ruiz-Lara, T.; Falcón-Barroso, J.; Sánchez, S. F.; Sánchez-Blázquez, P.; Márquez, I.; Masegosa, J.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 3, p.3794-3815
Advertised on:
5
2019
Citations
6
Refereed citations
5
Description
We present a pilot study aimed to identify large-scale galaxy properties
that could play a role in activating a quiescent nucleus. To do so, we
compare the properties of two isolated nearby active galaxies and their
non-active twins selected from the Calar Alto Legacy Integral Field Area
(CALIFA) survey. This pilot sample includes two barred and two unbarred
galaxies. We characterize the stellar and ionized gas kinematics and
also their stellar content. We obtain simple kinematic models by fitting
the full stellar and ionized gas velocity fields and just the
approaching or receding sides. We find that the analysed active galaxies
present lopsided discs and higher values of the global stellar angular
momentum (λR) than their non-active twins. This could
be indicating that the stellar discs of the AGN gained angular momentum
from the inflowing gas that triggered the nuclear activity. The inflow
of gas could have been produced by a twisted disc instability in the
case of the unbarred AGN, and by the bar in the case of the barred AGN.
In addition, we find that the central regions of the studied active
galaxies show older stellar populations than their non-active twins. The
next step is to statistically explore these galaxy properties in a
larger sample of twin galaxies.
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