Chemical enrichment in very low metallicity environments: Boötes I

Chemical enrichment in very low metallicity environments: Boötes I
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极低金属丰度环境中的化学富集:Boâtes I

DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
R. Leaman
R. Leaman
中科院分区:
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文献类型:
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作者:
D. Romano;M. Bellazzini;E. Starkenburg;R. Leaman

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我们提出了超暗矮星系牧夫座I不同的化学演化模型。我们要么假设星系通过原始化学成分的气体(经典模型)的顺利降落,或采用来自合并树与半分析模型(宇宙学动机模型)相结合的质量吸积的历史,其质量吸积。此外,我们考虑模型,并没有考虑到不均匀的混合在ISM内的星系。然后将理论预测相互比较,并与可用数据的主体进行比较。从这个分析中,我们证实了以前的发现,牧夫座I形成恒星的效率非常低,但与以前的研究不同,我们没有发现一个明确的迹象表明超新星爆炸在这个星系中持续了长期的银河系规模的外流。因此,我们认为,外部机制,如冲压压力剥离和潮汐剥离需要解释的情况下,中性气体的Bootes I今天。
We present different chemical evolution models for the ultrafaint dwarf galaxy Bootes I. We either assume that the galaxy accretes its mass through smooth infall of gas of primordial chemical composition (classical models) or adopt mass accretion histories derived from the combination of merger trees with semi-analytical modelling (cosmologically-motivated models). Furthermore, we consider models with and without taking into account inhomogeneous mixing in the ISM within the galaxy. The theoretical predictions are then compared to each other and to the body of the available data. From this analysis, we confirm previous findings that Bootes I has formed stars with very low efficiency but, at variance with previous studies, we do not find a clear-cut indication that supernova explosions have sustained long-lasting galactic-scale outflows in this galaxy. Therefore, we suggest that external mechanisms such as ram pressure stripping and tidal stripping are needed to explain the absence of neutral gas in Bootes I today.
DOI: 10.1088/0004-6256/135/4/1361
发表时间: 2007-08
期刊: The Astronomical Journal
影响因子: --
作者:
J. D. Jong;H. Rix;N. F. Martin;D. Zucker;A. Dolphin;E. F. Bell;V. Belokurov;N. W. E. Mpia;Heidelberg IoA;Cambridge Steward Obs.;Tucson
通讯作者: J. D. Jong;H. Rix;N. F. Martin;D. Zucker;A. Dolphin;E. F. Bell;V. Belokurov;N. W. E. Mpia;Heidelberg IoA;Cambridge Steward Obs.;Tucson
DOI: 10.1088/0067-0049/192/2/18
发表时间: 2011-02-01
影响因子: 8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者: Wright, E. L.