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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku Observation of the Metallicity Distributionin the Elliptical Galaxy NGC 4636
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Suzaku Observation of the Metallicity Distributionin the Elliptical Galaxy NGC 4636

机译：朱雀对椭圆星系NGC 4636中金属分布的观察

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NGC 4636, an X-ray bright elliptical galaxy, was observed for 70 ks with Suzaku. Thanks to low backgroundand good energy resolution of the XIS, we succeeded to estimate the foreground Galactic emission accurately, and,for the first time, measure the metal abundance distributions out to~28'(≈ 140 kpc) for O, Mg, Si, and Fe. Themetal abundances are as high as > 1 solar within 4', and decreases by ~50% from the center toward the outerregion. In addition, the 0 to Fe abundance ratio is about 0.6~1.0 solar in all analyzed regions, indicating thatmetal products by SNe II and SNe Ia have mixed and diffused to the outer region of the galaxy. Furthermore,comparing the O and Fe mass distributions with those of NGC 1399, we found the metal mass-to-light ratio (MLR)of NGC 4636 to be 2-3 times larger. Therefore, the metal distributions in NGC 4636 are less extended than thosein NGC 1399, possibly due to environmental factors, such as frequency of galaxy interaction. We also found thatMLRs of NGC 4636 at 0.1 r_(180)are ~5-times smaller than those of clusters galaxies, possibly consistent with thecorrelation between temperature and MLR of other spherically symmetric groups of galaxies. We also confirmeda signature of the resonance scattering of the Fe XVII line in the central region, as reported based on the XMM-Newton RGS observation.
机译：用朱雀将70 ks观测到NGC 4636，这是一个X射线明亮的椭圆星系。由于XIS的低背景和良好的能量分辨率，我们成功地准确估算了前景银河的发射，并且首次测量了O，Mg，Si，Al到〜28'（≈140 kpc）的金属丰度分布。和铁。金属丰度在4'内高达> 1太阳，并且从中心到外围区域降低约50％。另外，在所有被分析的区域中，0到Fe的丰度比约为0.6〜1.0太阳，表明SNe II和SNe Ia的金属产物已经混合并扩散到银河系的外部。此外，通过将O和Fe的质量分布与NGC 1399的分布进行比较，我们发现NGC 4636的金属质轻比（MLR）大2-3倍。因此，NGC 4636中的金属分布比NGC 1399中的金属分布扩展少，这可能是由于环境因素（例如星系相互作用的频率）所致。我们还发现，NGC 4636在0.1 r_（180）处的MLR比星团星系小约5倍，这可能与温度和其他球对称星系的MLR的相关性一致。根据XMM-Newton RGS观察，我们还证实了Fe XVII线在中心区域的共振散射的特征。

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