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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130523T103000
DTEND;TZID=Atlantic/Canary:20130523T113000
UID:iactalks-495
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/495
CREATED:2013-05-23T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Formation and evolution of double-barred galaxies
DESCRIPTION:Formation and evolution of double-barred galaxies\nDr. Adriana 
 De Lorenzo-Cáceres Rodríguez\n\nThe general picture of galaxy formation 
 and evolution includes bars as the main drivers of the internal secular pr
 ocesses affecting the lifetime of disc galaxies. Bars are present in a ver
 y high fraction of all the spiral galaxies found at different redshifts, a
 nd the processes inducing their formation or the effects they may have on 
 their host galaxies are still under discussion. Particularly interesting i
 s the case of double-barred galaxies: at least 20% of all spirals have tur
 ned out to host not only one but two bars embedded in them. These two bars
  appear randomly oriented and independently rotating. The formation of suc
 h a double-barred system has been the goal of several numerical simulation
 s and the results obtained so far can be roughly divided in two big groups
 : gas-rich and gas-free formation scenarios. In the same way a single bar 
 does, double-bar systems might also promote gas inflow and contribute to t
 he internal secular evolution. Moreover, they have also been proposed as a
  very efficient mechanism for the feeding of the active galactic nuclei.\n
 All the previous theoretical hypothesis on the formation and evolution of 
 double-barred galaxies have not been tested due to the lack of observation
 al works focused on these systems. With this motivation, during my PhD I o
 bserved a sample of double-barred galaxies in order to fully analyse their
  kinematics and stellar populations. Among the most interesting results, i
 t is important to highlight the discovery of the sigma-hollows, which are 
 the only known kinematical signature of the presence of inner bars, or the
  fact that inner bars are younger and more metal-rich than their surroundi
 ng regions. In this talk I will present the whole work and discuss the res
 ults in the framework of the different formation scenarios and the role th
 at these inner bars may be playing in the evolution of their host galaxies
 .
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