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The SUNBIRD Survey: Insights into small-scale star formation mechanisms through near-infrared study of Young Massive Clusters

Published online by Cambridge University Press:  09 June 2023

Zara Randriamanakoto Open the ORCID record for Zara Randriamanakoto [Opens in a new window] ,
P. Väisänen  and
P. Ranaivomanana
Zara Randriamanakoto
Affiliation:
South African Astronomical Observatory P.O Box 9, Observatory 7935, South Africa email: zara@saao.ac.za
P. Väisänen
Affiliation:
South African Astronomical Observatory P.O Box 9, Observatory 7935, South Africa email: zara@saao.ac.za Southern African Large Telescope P.O Box 9, Observatory 7935, South Africa
P. Ranaivomanana
Affiliation:
Department of Astrophysics/IMAPP, Radbourd Observatory P.O Box 9010, 6500 GL, Nijmegen, The Netherlands
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Abstract

We draw the K-band luminosity functions (CLFs) of young massive clusters (YMCs) hosted by 34 SUNBIRD targets to evaluate the impact of the host galaxy environment on their YMC properties. The depth and high resolution of the NIR images (PSF ∼ 0.1”) allow us to test whether CLF power-law slopes (α) of high star-forming galaxies are similar to those of gas-poor low star formation rate (SFR) galaxies. We found that α ranges between 1.53 and 2.41 with a median value of 1.87 ± 0.23. We also performed correlation searches between α and the host global properties and noticed that α decreases with an increasing SFR and SFR density. On sub-galactic scales, CLF slopes of cluster-rich galaxies differ by ∼0.5. Our NIR CLF analyses suggest that the extreme environment of high SFR galaxies such as the SUNBIRD sample is likely to affect the formation mechanisms of YMCs and hence to govern the ongoing small-scale SF processes of the host galaxy.

Keywords

galaxies: interactionsgalaxies: star clustersinfrared: galaxies
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies (Aug 2022) , August 2021 , pp. 87 - 92
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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