Disk mass and disk heating in the spiral galaxy NGC 3223
Disk mass and disk heating in the spiral galaxy NGC 3223
复制标题
螺旋星系 NGC 3223 中的盘质量和盘加热
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. Viaene
中科院分区：
文献类型：
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作者：
G. Gentile;C. Tydtgat;M. Baes;G. D. Geyter;M. Koleva;G. Angus;W. D. Blok;W. Saftly;S. Viaene
我们提出了Sb星系NGC 3223的恒星和气体运动学，目的是确定垂直和径向恒星速度色散作为半径的函数，这有助于约束盘加热理论。与观测到的近红外光度一起，垂直速度色散也用于确定恒星的质量光比（M/L），这通常是根据观测到的旋转曲线推导暗物质分布时最大的不确定因素之一。我们发现，垂直-径向速度色散比σz/σR = 1.21±0.14，显著高于已知相关性的预期；弱约束的ks波段恒星M/L比在0.5-1.7之间，处于恒星群综合模型预测的高端（但与之一致）。然而，这样一个对恒星质量比的微弱限制，并不能让我们安全地确定暗物质的密度分布。要做到这一点，要么需要统计方法，要么需要额外的数据（如积分场单位）。根据68. b . 0588号提案在智利欧洲南方天文台收集的观测资料。
We present the stellar and gaseous kinematics of an Sb galaxy, NGC 3223, with the aim of determining the vertical and radial stellar velocity dispersion as a function of radius, which can help to constrain disk heating theories. Together with the observed NIR photometry, the vertical velocity dispersion is also used to determine the stellar mass-to-light (M/L) ratio, typically one of the largest uncertainties when deriving the dark matter distribution from the observed rotation curve. We find a vertical-to-radial velocity dispersion ratio of σz/σR = 1.21 ± 0.14, significantly higher than expectations from known correlations, and a weakly-constrained Ks-band stellar M/L ratio in the range 0.5-1.7, which is at the high end of (but consistent with) the predictions of stellar population synthesis models. Such a weak constraint on the stellar M/L ratio, however, does not allow us to securely determine the dark matter density distribution. To achieve this, either a statistical approach or additional data (e.g. integral-field unit) are needed. Based on observations collected at the European Southern Observatory, Chile, under proposal 68.B-0588.
影响因子：
7.8
作者：
Lukewich MK;Rogers RC;Lomax AE
通讯作者：
Lomax AE