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Comparing ALMA, VLT, and HST data for Massive, Young Clusters in Grand-Design Spirals

Published online by Cambridge University Press:  31 March 2017

Preben Grosbøl  and
Horacio Dottori
Preben Grosbøl
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85378 Garching, Germany email: pgrosbol@eso.org
Horacio Dottori
Affiliation:
Instituto de Física, Univ. Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil email: dottori@ufrgs.br
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Abstract

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A population of young, massive stellar cluster complexes with near-infrared (NIR) colors indicating high extinction (i.e. Av ~ 7m) was identified on HAWK-I/VLT images of several nearby, grand-design spiral galaxies. Models suggest that they are very young cluster complexes still embedded in a dust/gas envelope which will be expelled after 5-7 Myr. This type of very young, embedded clusters are not seen in optical studies using HST data.

A detailed comparison of HST and HAWK-I images was done to better understand the discrepancy between the optical and NIR detection of stellar clusters in nearby galaxies. More than 70% of the NIR clusters are located close to dust lanes which would make an optical detection difficult. A comparison of the ALMA CO(1-0)-map of NGC 4321 and the young, massive clusters shows that 60% of them have CO emission within 2“ indicating a correlation between giant molecular clouds and formation of massive clusters.

Keywords

galaxies: star clustersgalaxies: spiral

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