NGC 5044星系群堆芯中的AGN驱动天气和多相气体
AGN Driven Weather and Multiphase Gas in the Core of the NGC 5044 Galaxy Group
摘要：
钱德拉天文台对X射线亮群NGC 5044的深层观测表明，这个亮群的中心区域受到活动星系核反复爆发的强烈扰动。这些最近的活动星系核爆发产生了许多小的X射线腔，冷丝和冷锋。我们发现最冷的X射线发射气体和形态的Ha丝之间的相关性。Ha细丝朝向X射线空洞的方向，这表明导致Ha发射的温暖气体起源于NGC 5044的中心附近，并被疏浚到浮力，AGN膨胀的X射线空洞后面。详细的光谱分析表明，NGC 5044的中心区域包含空间上不同数量的多相气体。最不均匀的气体温度分布的区域往往与扩展的235 MHz和610 MHz的无线电发射探测到的GMRT。这可能是由于气体夹带在无线电发射等离子体或不同温度的气体混合在周围的区域由活动星系核诱导的湍流无线电发射等离子体。考虑到多相气体的影响，我们发现重元素的丰度在中心100 kpc内相当均匀，除了氧之外的所有元素的丰度都是太阳的60-80%，氧具有显着的亚太阳丰度。在没有持续活动星系核爆发的情况下，NGC 5044中心的气体通过耗散湍流动能和热传导，在大约10 e8年的时间里，气体温度的分布应该更加均匀。NGC 5044中多相气体的存在表明最近AGN爆发之间的时间小于约10 e8年。
英文摘要：
A deep Chandra observation of the X-ray bright group, NGC 5044, shows that the central region of this group has been strongly perturbed by repeated AGN outbursts. These recent AGN outbursts have produced many small X-ray cavities, cool filaments and cold fronts. We find a correlation between the coolest X-ray emitting gas and the morphology of the Ha filaments. The Ha filaments are oriented in the direction of the X-ray cavities, suggesting that the warm gas responsible for the Halpha emission originated near the center of NGC 5044 and was dredged up behind the buoyant, AGN-inflated X-ray cavities. A detailed spectroscopic analysis shows that the central region of NGC 5044 contains spatially varying amounts of multiphase gas. The regions with the most inhomogeneous gas temperature distribution tend to correlate with the extended 235 MHz and 610 MHz radio emission detected by the GMRT. This may result from gas entrainment within the radio emitting plasma or mixing of different temperature gas in the regions surrounding the radio emitting plasma by AGN induced turbulence. Accounting for the effects of multiphase gas, we find that the abundance of heavy elements is fairly uniform within the central 100 kpc, with abundances of 60-80% solar for all elements except oxygen, which has a significantly sub-solar abundance. In the absence of continued AGN outbursts, the gas in the center of NGC 5044 should attain a more homogeneous distribution of gas temperature through the dissipation of turbulent kinetic energy and heat conduction in approximately 10e8 yr. The presence of multiphase gas in NGC 5044 indicates that the time between recent AGN outbursts has been less than approximately 10e8 yr.
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