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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110426T000000
DTEND;TZID=Atlantic/Canary:20110426T010000
UID:iactalks-259
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/259
CREATED:2011-04-26T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Testing the Unification Model for AGN in the Infrared: are the obsc
 uring tori of Type 1 and 2 Seyferts different? 
DESCRIPTION:Testing the Unification Model for AGN in the Infrared: are the 
 obscuring tori of Type 1 and 2 Seyferts different? \nDr. Cristina Ramos Al
 meida\n\nI will present new mid-infrared imaging data for a sample of ~20 
 nearby  Seyfert galaxies obtained with T-ReCS and MICHELLE on the Gemini  
 Telescopes at subarcsecond resolution. Our aim is to compare the  properti
 es of Type-1 and Type-2 Seyfert tori using clumpy torus models  and a Baye
 sian approach to fit the infrared nuclear spectral energy  distributions (
 SEDs). These dusty tori have physical sizes smaller than  10 pc radius, as
  derived from our fits. Unification schemes of AGN  account for a variety 
 of observational differences in terms of viewing  geometry. However, we fi
 nd evidence that strong unification may not  hold, and that the immediate 
 dusty surroundings of Type-1 and Type-2  Seyfert nuclei are intrinsically 
 different. The Type-2 tori studied here  are broader, have more clumps, an
 d these clumps have lower optical  depths than those of Type-1 tori. The l
 arger the covering factor of the  torus, the smaller the probability of ha
 ving direct view of the AGN, and  vice-versa. In our sample, Seyfert 2 tor
 i have larger covering factors  and smaller escape probabilities than thos
 e of Seyfert 1. Thus, on the  basis of the results presented here, the cla
 ssification of a Seyfert  galaxy as a Type-1 or Type-2 depends more on the
  intrinsic properties of  the torus rather than on its mere inclination, i
 n contradiction with  the simplest unification model.
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