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AN INITIAL MASS FUNCTION STUDY OF THE DWARF STARBURST GALAXY NGC 4214

Author(s)
Andrews, J. E.; Calzetti, D.; Chandar, R.; Lee, J. C.; Elmegreen, B. G.; Kennicutt, R. C.; Whitmore, B.; Kissel, Jeffrey S.; da Silva, Robert L.; Krumholz, Mark R.; O'Connell, R. W.; Dopita, M. A.; Frogel, Jay A.; Kim, Hwihyun; ... Show more Show less
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Abstract
The production rate of ionizing photons in young (≤8 Myr), unresolved stellar clusters in the nearby irregular galaxy NGC 4214 is probed using multi-wavelength Hubble Space Telescope WFC3 data. We normalize the ionizing photon rate by the cluster mass to investigate the upper end of the stellar initial mass function (IMF). We have found that within the uncertainties the upper end of the stellar IMF appears to be universal in this galaxy, and that deviations from a universal IMF can be attributed to stochastic sampling of stars in clusters with masses lap103 M ☉. Furthermore, we have found that there does not seem to be a dependence of the maximum stellar mass on the cluster mass. We have also found that for massive clusters, feedback may cause an underrepresentation in Hα luminosities, which needs to be taken into account when conducting this type of analysis.
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/95421
Department
MIT Kavli Institute for Astrophysics and Space Research
Journal
Astrophysical Journal
Publisher
Institute of Physics/American Astronomical Society
Citation
Andrews, J. E., D. Calzetti, R. Chandar, J. C. Lee, B. G. Elmegreen, R. C. Kennicutt, B. Whitmore, et al. “AN INITIAL MASS FUNCTION STUDY OF THE DWARF STARBURST GALAXY NGC 4214.” The Astrophysical Journal 767, no. 1 (March 25, 2013): 51. © 2013 American Astronomical Society.
Version: Final published version
ISSN
0004-637X
1538-4357

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