The Mg II λ2797, λ2803 emission in low-metallicity star-forming galaxies from the SDSS
The Mg II λ2797, λ2803 emission in low-metallicity star-forming galaxies from the SDSS
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SDSS 低金属丰度恒星形成星系中的 Mg II λ2797、λ2803 发射
DOI：
10.1051/0004-6361/201221010
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发表时间：
2013
影响因子：
6.5
通讯作者：
S. Arabia
中科院分区：
文献类型：
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作者：
N. Guseva;Y. Izotov;K. Fricke;C. M. F. Radioastronomie;Bonn;H Germany;M. A. Observatory;Kyiv;Ukraine;I. F. Astrophysik;Goettingen;A. Department;King Abdulaziz University;Jeddah;S. Arabia
我们提供了62个恒星形成星系的65个斯隆数字巡天（SDSS）光谱，氧丰度为12 + logO/H 7.5 - 8.4。选定星系的红移范围为z0.36 - 0.70。这使我们能够检测到红移的Mg II 2797，2803发射线。我们的目标是使用这些线的镁丰度测定。Mg II发射在三分之二的星系中被检测到。我们发现Mg II 2797发射线强度随激发参数x = O 2+ /O的变化趋势与云光电离H II区模型预测的相似，表明Mg II发射的星云起源。Mg/O丰度比比太阳比低2倍。这可能是星际Mg II吸收和Mg耗尽到尘埃上的综合效应。然而，选定星系中的尘埃耗尽（如果存在的话）的影响很小，比铁的影响低2倍。
We present 65 Sloan Digital Sky Survey (SDSS) spectra of 62 star-forming galaxies with oxygen abundances 12 + logO/H � 7.5 ‐ 8.4. Redshifts of selected galaxies are in the range z � 0.36 ‐ 0.70. This allows us to detect the redshifted Mg II �2797, �2803 emission lines. Our aim is to use these lines for the magnesium abundance determination. The Mg II emission was detected in � 2/3 of the galaxies. We find that the Mg II �2797 emission-line intensity follows a trend with the excit ation parameter x = O 2+ /O that is similar to that predicted by CLOUDY photoionised H II region models, suggesting a nebular origin of Mg II emission. The Mg/O abundance ratio is lower by a factor � 2 than the solar ratio. This is probably the combined effect of interstellar Mg II absorption and depletion of Mg onto dust. However, the effect of dust depletion in selected galaxies, if present, is small, by a factor of �2 lower than that of iron.
DOI：
--
发表时间：
2004
期刊：
The Papers of Joint Technical Meeting on Power Engineering and Power System Engineering, IEE Japan PE-04-26, PSE-04-26
影响因子：
--
作者：
Megumi Katayama;Yasunori Mitani;Osamu Saeki;Masahide Hojo;Hiroyuki Ukai
通讯作者：
Hiroyuki Ukai