تقرير
The SUNBIRD survey: the K-band luminosity functions of young massive clusters in intensely star-forming galaxies
| العنوان: | The SUNBIRD survey: the K-band luminosity functions of young massive clusters in intensely star-forming galaxies |
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| المؤلفون: | Randriamanakoto, Z., Vaisanen, P., Ranaivomanana, P., Ramphul, R., Kankare, E., Mattila, S., Ryder, S. D., Kotilainen, J. |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | Strongly star-forming galaxies are prolific in producing the young and most massive star clusters (YMCs) still forming today. This work investigates the star cluster luminosity functions (CLFs, dN/dL ~ L^{-alpha}) of 26 starburst and luminous infrared galaxies (LIRGs) taken from the SUNBIRD survey. The targets were imaged using near-infrared (NIR) K-band adaptive optics systems. Single power-law fits of the derived CLFs result in a slope ranging between 1.53 and 2.41, with the median and average of 1.87 +/- 0.23 and 1.93 +/- 0.23, respectively. Possible biases such as blending effects and the choice of binning should only flatten the slope by no more than ~0.15, especially for cases where the luminosity distance of the host galaxy is below 100 Mpc. Results from this follow-up study strengthen the conclusion from our previous work: the CLF slopes are shallower for strongly star-forming galaxies in comparison to those with less intense star formation activity. There is also a (mild) correlation between the slope and both the host galaxy's star formation rate (SFR) and SFR density Sigma_SFR, i.e. the CLF flattens with an increasing SFR and Sigma_SFR. Finally, we also find that CLFs on sub-galactic scales associated with the nuclear regions of cluster-rich targets (N ~ 300) have typically shallower slopes than the ones of the outer field by ~0.5. Our analyses suggest that the extreme environments of strongly star-forming galaxies are likely to influence the cluster formation mechanisms and ultimately their physical properties. Comment: 25 pages, accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac1103 |
| URL الوصول: | http://arxiv.org/abs/2204.07095 |
| رقم الأكسشن: | edsarx.2204.07095 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac1103 |
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