Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..208r&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
High resolution studies reveal that luminous young stellar clusters and their associations are ubiquitous within 1 kpc of ULIRGs and could be the precursors to globular clusters. We have undertaken a study of the ages masses extinction and dust properties of the clusters found in the brightest ULIRG in the extended IRAS BGS Sample IRAS17208-0014 using it as a unique system in which to study the formation and evolution of clusters in gas-rich mergers. Using NICMOS JHK and WFPC2 I-band images we have compared the near-IR colors of the clusters with those expected from a Bruzual & Charlot model. There are a few clusters whose colors can be explained by moderate values of extinction (1-3 mag) but others require some contribution from hot (400-1000K) dust. We derive ages of 1-few tens of Myr and masses of 106 to 107 Msun. These clusters may be supermassive in comparison to globular clusters or could be unresolved associations of clusters. We have submitted a Cycle 12 ACS proposal to image IRAS17208-0014 in an effort to resolve the clusters on a scale comparable to the largest globular clusters and obtain BVI imaging to break the degeneracy between extinction and hot dust emission.
Jogee Shardha
Reddy Naveen A.
Scoville Nick
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