AN INITIAL MASS FUNCTION STUDY OF THE DWARF STARBURST GALAXY NGC 4214
| Autor: | J. E. Andrews, D. Calzetti, R. Chandar, J. C. Lee, B. G. Elmegreen, R. C. Kennicutt, B. Whitmore, J. S. Kissel, Robert L. da Silva, Mark R. Krumholz, R. W. O'Connell, M. A. Dopita, Jay A. Frogel, Hwihyun Kim |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Initial mass function Photon Stellar mass 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Galaxy Stars Space and Planetary Science 0103 physical sciences Cluster (physics) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Irregular galaxy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Production rate |
| Zdroj: | The Astrophysical Journal. 767:51 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1088/0004-637x/767/1/51 |
| Popis: | 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 ≾ 10^3 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. |
| Databáze: | OpenAIRE |
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