arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.4932astro-ph.CO
收藏

蓝致密矮星系在光学和近红外波段的光度-金属丰度关系

Luminosity-Metallicity Relations for Blue Compact Dwarf Galaxies in the Optical and Near-Infrared

Yinghe Zhao, Yu Gao, Qiusheng Gu

备注：
32 pages, 7 figures, accepted for publication in the Astrophysical Journal
发表信息：
Astrophys.J.710:663-675,2010
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

本文系统地研究了一组贫金属致密蓝矮星系的B-、R-和$K_s$ -波段光度-金属丰度（L-Z）关系。通过使用经验N2和直接$T_e$方法推导金属丰度。我们的工作调和了不同作者得到的相互矛盾的结果，并表明L-Z关系也适用于蓝色致密矮星系。对于每个光度带，L-Z关系的经验N2斜率与基于$T_e$的斜率一致。我们证实了L-Z关系的斜率在近红外波段比在光学波段要小。通过对$L_B$ -Z关系残差与不同星系参数之间的相关性研究，发现恒星形成活动可能是导致光学L-Z关系中大散射的一个原因，而内部吸收可能是另一个可能的影响因素。

英文摘要：

In this paper, we present systematic studies on the B-, R- and $K_s$-band luminosity-metallicity (L-Z) relations for a set of metal poor, blue compact dwarf galaxies. Metallicity is derived by using both the empirical N2 and the direct $T_e$ methods. Our work reconciles contradictory results obtained by different authors and shows that the L-Z relationship does also hold for blue compact dwarf galaxies. The empirical N2-based slope of the L-Z relation, for each photometric band, is consistent with the $T_e$-based one. We confirm that the slope of the L-Z relation is shallower in the near-infrared than that in the optical. Our investigations on the correlations between the $L_B$-Z relation residuals and different galactic parameters show that the star formation activities could be a cause of the large scatter in the optical L-Z relationships, whereas the internal-absorption might be another possible contributing factor.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑