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VERSION:2.0
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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20081009T000000
DTEND;TZID=Atlantic/Canary:20081009T010000
UID:iactalks-195
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/195
CREATED:2008-10-09T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Nuclear star formation in nearby galaxies with adaptive optics in t
 he NIR
DESCRIPTION:Nuclear star formation in nearby galaxies with adaptive optics 
 in the NIR\nDr. Juan Antonio Fernández Ontiveros\n\nStarbursts and AGNs a
 re frequently coupled in the central kiloparsecs of Seyfert galaxies, wher
 e molecular gas plays a critical role in fueling nuclear starburst activit
 y and feeding the central black hole. Unveiling the dusty nuclear regions 
 with high-spatial resolution techniques in the near-infrared (NIR) permits
  us to disentangle the AGN and the stellar clusters, characterizing both s
 ources separately. In this context, a small sample of nearby galaxies have
  been observed with VLT/NaCo adaptive optics in the NIR. These observation
 s were completed with similar high-spatial resolution data in the mid-infr
 ared (VLT/VISIR), optical (HST) and radio wavelengths (VLA).\n\nA new alig
 nment for the starburst galaxy NGC 253 was found based on NIR and radio da
 ta, due to the high-spatial resolution in both spectral regions, finding N
 IR counterparts for 8 known radio sources. It is remarkable the lack of an
 y optical or IR counterpart for the radio core, proposed as a low luminosi
 ty AGN, which presents an IR-to-radio emission ratio similar (or even lowe
 r) than Sgr. A*. Using the high-spatial resolution aligned dataset from op
 tical-IR to radio wavelengths we derived a representative spectral energy 
 distribution (SED) based on 37 young dust embedded clusters resolved in th
 e inner 0.4 kpc. The template is characterized by a maximum at 20 μ and
  a gentle bump in the 1-2 μ range.\n\nThese features, absent in lower s
 patial resolution templates, can be well reproduced by considering an impo
 rtant contribution of very young stellar objects to the IR, and are thus a
 ssociated with hot dust surrounding the protostars. The average SED was th
 en compared with the nuclear star forming regions found in the Seyfert 2/s
 tarburst galaxy NGC 7582.\n\n
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