Near-infrared line and continuum emission from the blue dwarf galaxy II Zw 40
Near-infrared line and continuum emission from the blue dwarf galaxy II Zw 40
复制标题
蓝矮星星系 II Zw 40 的近红外线和连续谱发射
DOI：
10.1086/166544
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
D. Lester
中科院分区：
文献类型：
--
作者：
M. Joy;D. Lester
对新的近红外线和连续谱测量结果的分析表明，星云复合发射和年轻蓝色恒星的光球辐射在矮星系II Zw 40的中央6角秒内产生了大部分的近红外连续谱发射。推导出的星云复合水平与射电自由-自由连续谱的独立观测结果非常一致。据发现，演变的恒星，占主导地位的近红外辐射从正常的星系，贡献不超过25%的总2.2微米通量的中心区域的II Zw 40。得出的结论是，在银河系中心400 pc的演化恒星人口的总质量小于约两亿太阳。最近形成的恒星的总质量约为200万个太阳，恒星质量比非常大。因此，II Zw 40是一个典型的星暴星系。27篇参考文献。
A multicolor analysis of new near-infrared line and continuum measurements indicates that nebular recombination emission and photospheric radiation from young blue stars produce most of the near-infrared continuum emission in the central 6 arcsec of the dwarf galaxy II Zw 40. The derived nebular recombination level is in excellent agreement with independent observations of the radio free-free continuum. It is found that evolved stars, which dominate the near-infrared emission from normal galaxies, contribute no more than 25 percent of the total 2.2 micron flux in the central region of II Zw 40. It is concluded that the total mass of the evolved stellar population in the central 400 pc of the galaxy is less than about two hundred million solar. The total mass of recently formed stars is about two million solar, and the stellar mass ratio is exceptionally large. Thus, II Zw 40 is a quintessential starburst galaxy. 27 references.