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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230418T123000
DTEND;TZID=Atlantic/Canary:20230418T133000
UID:iactalks-1675
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1675
CREATED:2023-04-18T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:JWST view of Polycyclic Aromatic Hydrocarbons and dust in local act
 ive galaxies
DESCRIPTION:JWST view of Polycyclic Aromatic Hydrocarbons and dust in local
  active galaxies\nDr. Ismael García Bernete\n\n \nNowadays, it is wi
 dely accepted that most  galaxies undergo an active phase in their evoluti
 on. The impact of the  energy released by active galactic nuclei (AGN) in 
 the interstellar  medium (ISM) of the host galaxy  has been proposed as a 
 key mechanism responsible for regulating star  formation (SF). The mid-inf
 rared (IR) is the ideal spectral range to  investigate the nuclear/circumn
 uclear regions of AGN since dust  extinction is significantly lower compar
 ed to the visible  range. Furthermore, it provides unique tracers to study
  the AGN-SF  connection such as H2 rotational lines, fine structure lines 
 and  Polycyclic Aromatic Hydrocarbons (PAHs). PAHs are also a powerful too
 l  to characterize the ISM in different environments.\n\nRecently, we pres
 ented new JWST/MIRI MRS  spectroscopy of three Seyfert AGN in which we com
 pare their nuclear PAH  emission with that of star-forming regions. This s
 tudy represents the  first of its kind to use sub-arcsecond angular  resol
 ution data of local luminous Seyferts (Lbol > 10^44.5 erg/s)  with a wi
 de wavelength coverage (4.9-28.1 μm). Our results showed that a  suite 
 of PAH features is present in the innermost parts of these  Seyfert galaxi
 es. We found that the nuclear regions  of AGN lie at different positions o
 f the PAH diagnostic diagrams,  whereas the SF regions are concentrated ar
 ound the average values of SF  galaxies. Furthermore, we find that the nuc
 lear PAH emission mainly  originates in neutral PAHs while, in contrast, P
 AH  emission originating in the star forming regions favours small ionised
   PAH grains. Therefore, our results provide evidence that the AGN have a 
  significant impact on the ionization state and size of the PAH grains on 
  scales of ~142-245 pc. This is fundamental  since PAH bands are routinely
  used to measure star-formation activity  in near and far SF and active ga
 laxies.\n\nFinally, I will summarise our ongoing JWST work within the GATO
 S  (Galactic Activity, Torus and Outflow Survey) collaboration. In  partic
 ular, I will focus on our recent study about the survival of PAH  molecule
 s in AGN-driven outflows.
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