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首页> 外文期刊>The Astrophysical journal >THE UNUSUAL X-RAY COLLISION MORPHOLOGY OF NGC 4782/4783 (3C 278)
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THE UNUSUAL X-RAY COLLISION MORPHOLOGY OF NGC 4782/4783 (3C 278)

机译：NGC 4782/4783（3C 278）的不寻常X射线碰撞形态

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摘要

Deep ROSAT HRI (High-Resolution Imager) imaging of the X-ray-emitting gas associated with the colliding elliptical galaxy pair NGC 4782/4783 reveals for the first time the complexity of the hot gas distribution in a pair of close interacting galaxies. The HRI image of NGC 4782/4783 shows hot gas around each galaxy, a high surface brightness X-ray bridge connecting the galaxy pair, tidal-like tails emerging from the two galaxies, and a sheet of gas at the interaction interface between the two galaxies. The hot gas distributions do not peak at the optical centers of the galaxies but are displaced in the same sense as the tidal distensions seen in the optical luminosity distributions. All of these remarkable features show the complexity of structure that develops in the hot gas distribution when both hydrodynamical and tidal forces come into play during collisions between ellipticals with hot gas components. Models by Borne and Colina of the bent two-sided radio jet 3C 278 (associated with NGC 4782) indicated that there must be a strong interaction between the hot gas components of NGC 4782/4783 and that the deflection of the radio jets is likely caused by the ram pressure exerted on the jet plasma by the hot gas associated with the passing companion NGC 4783. These conclusions are qualitatively confirmed by the HRI image and substantiate the major role played by the hot interstellar medium, and its asymmetries, in the propagation and entrainment of radio jets in colliding radio host ellipticals.
机译：与碰撞椭圆星系对NGC 4782/4783相关联的X射线发射气体的深ROSAT HRI（高分辨率成像仪）成像首次揭示了一对紧密相互作用的星系中热气体分布的复杂性。 NGC 4782/4783的HRI图像显示了每个星系周围的高温气体，连接该星系对的高表面亮度X射线桥，从两个星系中出现的潮汐状尾巴以及两个星体之间的相互作用界面处的一片气体星系。热气体分布在银河系的光学中心处未达到峰值，但以与在光学发光度分布中看到的潮汐膨胀相同的意义位移。所有这些显着的特征表明，当椭圆体与热气成分发生碰撞时，当流体动力和潮汐力同时起作用时，在热气分布中结构会变得复杂。 Borne和Colina的弯曲双面无线电射流3C 278（与NGC 4782关联）的模型表明，NGC 4782/4783的热气成分之间必须存在强烈的相互作用，并且可能导致无线电射流偏转通过与通过的伴随NGC 4783相关的热气体施加在射流等离子体上的冲压压力。HRI图像定性地证实了这些结论，并证实了星际热介质及其不对称性在传播和传播中的主要作用。无线电射流夹带在碰撞的无线电主椭圆中。

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