期刊
ASTROPHYSICAL JOURNAL
卷 767, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/767/1/51
关键词
galaxies: individual (NGC 4214); galaxies: star clusters: general; galaxies: star formation stars: luminosity function; mass function; stars: massive
资金
- NASA [NAS 5-26555]
- Alfred P. Sloan Fellowship
- NSF [CAREER-0955300]
- NASA through a Chandra Space Telescope Grant
- Astrophysics Theory and Fundamental Physics Grant [NNX09AK31G]
- National Science Foundation Graduate Research Fellowship
- [GO-11360]
- Science and Technology Facilities Council [ST/H00243X/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [0955300] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0955300] Funding Source: National Science Foundation
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-circle dot. 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 Ha luminosities, which needs to be taken into account when conducting this type of analysis.
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