在NGC4435/4438系统中扩散的远红外和紫外辐射：潮汐流还是银河卷云？
Diffuse far-infrared and ultraviolet emission in the NGC4435/4438 system: tidal stream or Galactic cirrus?
摘要：
我们报道了在室女星系团中相互作用对NGC 4435/4438附近投射的漫反射远红外和远紫外辐射的发现。这一特征在空间上与众所周知的低表面亮度光学羽流相吻合，通常被解释为潮汐碎片。如果是河外的，这条流不仅代表了星团内尘埃最清晰的例子之一，也是星团内分子氢和大规模星团内恒星形成的罕见例子。然而，紫外线，远红外线，HI和CO的排放以及动力学的这一功能是非常不寻常的潮汐流，但典型的银河卷云。在支持卷云的情况下，我们发现，远红外和远紫外卷云发射之间的强空间相关性，观察整个中心的室女星系团，在几个度的尺度。这项研究表明，即使在光学和紫外线波长以及银河系高纬度地区，银河卷云污染也可能是戏剧性的。如果忽略，银河系尘埃云散射的漫射光的存在可能会显着偏离我们对低表面亮度特征和星系周围和星系团中观察到的漫射光的解释。
英文摘要：
We report the discovery of diffuse far-infrared and far-ultraviolet emission projected near the interacting pair NGC4435/4438, in the Virgo cluster. This feature spatially coincides with a well known low surface-brightness optical plume, usually interpreted as tidal debris. If extragalactic, this stream would represent not only one of the clearest examples of intracluster dust, but also a rare case of intracluster molecular hydrogen and large-scale intracluster star formation. However, the ultraviolet, far-infrared, HI and CO emission as well as the dynamics of this feature are extremely unusual for tidal streams but are typical of Galactic cirrus clouds. In support to the cirrus scenario, we show that a strong spatial correlation between far-infrared and far-ultraviolet cirrus emission is observed across the center of the Virgo cluster, over a scale of several degrees. This study demonstrates how dramatic Galactic cirrus contamination can be, even at optical and ultraviolet wavelengths and at high galactic latitudes. If ignored, the presence of diffuse light scattered by Galactic dust clouds could significantly bias our interpretation of low surface-brightness features and diffuse light observed around galaxies and in clusters of galaxies.
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