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arXiv 1503.05981astro-ph.GAastro-ph.CO
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NGC5005暗物质晕中的重子分布

Baryonic Distributions in the Dark Matter Halo of NGC5005

Emily E. Richards, L. van Zee, K. L. Barnes, S. Staudaher, D. A. Dale, T. T. Braun, D. C. Wavle, D. Calzetti, J. J. Dalcanton, J. S. Bullock, R. Chandar

摘要:

我们提出的结果,星系NGC 5005的多波长观测。我们使用新的中性氢(HI)的观测甚大阵列检查中性气体的形态和运动学。我们发现一个HI盘在径向范围20 \arcsec -140 \arcsec内具有良好的平坦旋转曲线。来自WIYN 3.5米望远镜上的SparsePak积分场单元的电离气体观测提供了中心70 \arcsec的运动学。我们使用SparsePak和HI速度场来推导NGC 5005的旋转曲线。斯皮策太空望远镜对NGC 5005的3.6μm深观测探测了其暗淡的扩展恒星星族。这些图像揭示了一个具有高表面亮度分量的大恒星盘,该分量在比HI中检测到的气体盘的范围近1.6倍的半径处过渡到低表面亮度分量。3.6μm图像也被分解为凸起和盘分量,以解释恒星的光分布。来自WIYN 0.9米望远镜的光学宽带B和R以及窄带Hα补充了3.6微米的数据,提供了关于主要恒星星族和当前恒星形成活动的信息。利用中性气体和电离气体的自转曲线,结合恒星核球和星盘光剖面,对NGC 5005的质量分布进行了分解,建立了一个暗物质晕模型。最大的恒星盘贡献的总旋转曲线只有约70%,这表明暗物质作出了显着的贡献的动力学在所有半径。

英文摘要:

We present results from multiwavelength observations of the galaxy NGC5005. We use new neutral hydrogen (HI) observations from the Very Large Array to examine the neutral gas morphology and kinematics. We find an HI disk with a well-behaved flat rotation curve in the radial range 20\arcsec-140\arcsec. Ionized gas observations from the SparsePak integral field unit on the WIYN 3.5m telescope provide kinematics for the central 70\arcsec. We use both the SparsePak and HI velocity fields to derive a rotation curve for NGC5005. Deep 3.6μm observations from the Spitzer Space Telescope probe the faint extended stellar population of NGC5005. The images reveal a large stellar disk with a high surface brightness component that transitions to a low surface brightness component at a radius nearly 1.6 times farther than the extent of the gas disk detected in HI. The 3.6μm image is also decomposed into bulge and disk components to account for the stellar light distribution. Optical broadband B and R and narrowband Hα from the WIYN 0.9m telescope complement the 3.6μm data by providing information about the dominant stellar population and current star formation activity. The neutral and ionized gas rotation curve is used along with the stellar bulge and disk light profiles to decompose the mass distributions in NGC5005 and determine a dark matter halo model. The maximum stellar disk contribution to the total rotation curve is only about 70\%, suggesting that dark matter makes a significant contribution to the dynamics at all radii.

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