Clumpy metal concentrations in elliptical galaxies NGC 4374 and NGC 4636

Clumpy metal concentrations in elliptical galaxies NGC 4374 and NGC 4636
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椭圆星系 NGC 4374 和 NGC 4636 中的块状金属浓度

DOI:
10.1088/1674-4527/10/3/003
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发表时间:
2010-03
影响因子:
1.8
通讯作者:
An, Tao
An, Tao
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Xu, Hai-Guang;Gu, Jun-Hua;Gu, Li-Yi;Zhang, Zhong-Li;Wang, Yu;An, Tao

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本文利用Chandra ACIS档案数据,对附近富含气体的椭圆星系NGC 4374和NGC 4636的金属分布进行了高空间分辨率的研究。我们定义硬度比HRFeL为0.65-1.4 keV的发射与0.3-0.6 keV和1.4-3.5 keV的发射的比值(在排除镁和硅线之后),以及作为在1.4- 3.5keV中的发射与在0.3- 0.6keV中的发射的比率的HRW,因此,HRFeL和HRFe图可以分别用于追踪铁丰度和气体温度分布。通过将à Trous小波算法应用于获得的发射硬度比图,我们发现HRFeL分布是高度不规则的,在0.1-1 Re尺度上表现出强烈的空间变化,不遵循HRFeL分布。由于温度变化的影响是小的,我们得出结论,大多数的高HRFeL区域很可能具有较高的丰度比周围的气体。我们还发现,这些高HRFEL子结构是不相关的LMXB或球状星团的人口,因此,它们的起源应该与活动星系核活动或合并。
We present a high spatial resolution study of metal distributions in the nearby, gas-rich elliptical galaxies NGC 4374 and NGC 4636 with the Chandra ACIS archive data. We define the hardness ratio HRFeL as the ratio of the emission in 0.65–1.4 keV to that in 0.3–0.6 keV and 1.4–3.5 keV (after the magnesium and silicon lines are excluded), and HRcont as the ratio of the emission in 1.4–3.5 keV to that in 0.3–0.6 keV, so that the HRFeL and HRcont maps can be used to trace the iron abundance and gas temperature distributions, respectively. By applying the à Trous wavelet algorithm to the obtained emission hardness ratio maps, we reveal that the HRFeL distributions are highly irregular, exhibiting strong spatial variations on 0.1–1 Re scales, which do not follow the HRcont distributions. Since the effect of temperature variation is small, we conclude that most of the high-HRFeL regions are very likely to possess higher abundances than the ambient gas. We also find that these high-HRFeL substructures are not associated with either the LMXB or globular cluster populations, thus their origins should be related to AGN activity or mergers.
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