Modeling the Gas Flow in the Bar of NGC 1365
Modeling the Gas Flow in the Bar of NGC 1365
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NGC 1365 棒中的气流建模
DOI：
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Observatory
中科院分区：
文献类型：
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作者：
R. Z. Sánchez;J. Sellwood;B. Weiner;T. University;S. Observatory
我们介绍了对强栏星系NGC1365的新观测，包括新的测光图像和法布里-珀罗光谱，以及对来自VLA档案的中性氢观测的详细重新分析。我们发现该星系在其I波段的光分布上同时具有显著的双对称性，并且在条形区的尘埃分布和气体运动学上具有强烈的不对称性。在Hα线上绘制的速度场显示明亮的H II区，其速度与周围气体的速度相差60-80公里S−1，这可能是由于流入物质的残余所致。我们使用两种不同的暗物质晕模型，并覆盖了很大范围的质光比(ϒ)和条形速度(Ωp)，尝试对条流进行流体动力学模拟，以估计单独的盘和晕质量。我们的模型都没有提供令人信服的数据拟合，但它们似乎最接近于快速条形，旋转速度约为1.2rB，ΥI≃2.0士1.0，这意味着一个巨大的但不是完全最大的磁盘。匹配的暗晕异常集中，这是由外旋转曲线下降所驱动的要求。
We present new observations of the strongly barred galaxy NGC 1365, including new photometric images and Fabry-Perot spectroscopy, as well as a detailed reanalysis of the neutral hydrogen observations from the VLA archive. We find the galaxy to be at once remarkably bisymmetric in its I-band light distribution and strongly asymmetric in the distribution of dust and in the kinematics of the gas in the bar region. The velocity field mapped in the Hα line reveals bright H II regions with velocities that differ by 60-80 km s−1 from that of the surrounding gas, which may be due to remnants of infalling material. We have attempted hydrodynamic simulations of the bar flow to estimate the separate disk and halo masses, using two different dark matter halo models and covering a wide range of mass-to-light ratios (ϒ) and bar pattern speeds (Ωp). None of our models provides a compelling fit to the data, but they seem most nearly consistent with a fast bar, corotation at ~1.2rB, and ΥI≃ 2.0 ± 1.0, implying a massive, but not fully maximal, disk. The fitted dark halos are unusually concentrated, a requirement driven by the declining outer rotation curve.
影响因子：
7.8
作者：
Lukewich MK;Rogers RC;Lomax AE
通讯作者：
Lomax AE