Spotting the differences between active and non-active twin galaxies on kpc-scales. A pilot study.

DOI: 
10.1093/mnras/stz637
Publication date: 
01/03/2019
Main author: 
Moral-Castro, I. del
IAA authors: 
Márquez, I.;Masegosa, J.
Authors: 
Moral-Castro, I. del;García-Lorenzo, B.;Almeida, C. Ramos;Ruiz-Lara, T.;Falcón-Barroso, J.;Sánchez, S. F.;Sánchez-Blázquez, P.;Márquez, I.;Masegosa, J.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Pages: 
3794-3815
Abstract: 
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 characterise the stellar and ionised gas kinematics and also their stellar content. We obtain simple kinematic models by fitting the full stellar and ionised gas velocity fields and just the approaching/receding sides. We find that the analysed active galaxies present lopsided disks and higher values of the global stellar angular momentum (λ<SUB>R</SUB>) than their non-active twins. This could be indicating that the stellar disks 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 disk 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.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074458951&doi=10.1093%2fmnras%2fstz637&partnerID=40&md5=94be39be003c8e746a1390119778b634
ADS Bibcode: 
2019MNRAS.485.3794D
Keywords: 
Galaxy: kinematics and dynamics;Galaxy: nucleus;galaxies: active