期刊
ASTRONOMICAL JOURNAL
卷 142, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/142/5/162
关键词
galaxies: dwarf; galaxies: individual (Mrk 36, UM 408, UM 461); galaxies: star clusters: general; galaxies: stellar content; infrared: galaxies
资金
- FCT/MCTES (Portugal)
- POPH/FSE
- spanish MICINN [CSD2006-00070, AYA2007-67965-C03-02, AYA2010-21887-C04-01]
- National Aeronautics and Space Administration
- [SFRH/BPD/ 72308/2010]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/72308/2010] Funding Source: FCT
We present a stellar population study of three H II galaxies (Mrk 36, UM 408, and UM 461) based on the analysis of new ground-based high-resolution near-infrared J, H, and K-p broadband and Br gamma narrowband images obtained with Gemini/NIRI. We identify and determine the relative ages and masses of the elementary star clusters and/or star cluster complexes of the starburst regions in each of these galaxies by comparing the colors with evolutionary synthesis models that include the contribution of stellar continuum, nebular continuum, and emission lines. We found that the current star cluster formation efficiency in our sample of low-luminosity H II galaxies is similar to 10%. Therefore, most of the recent star formation is not in massive clusters. Our findings seem to indicate that the star formation mode in our sample of galaxies is clumpy, and that these complexes are formed by a few massive star clusters with masses greater than or similar to 10(4) M-circle dot. The age distribution of these star cluster complexes shows that the current burst started recently and likely simultaneously over short timescales in their host galaxies, triggered by some internal mechanism. Finally, the fraction of the total cluster mass with respect to the low surface brightness (or host galaxy) mass, considering our complete range in ages, is less than 1%.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据