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SMOOTH DARK SPIRAL ARMS IN THE FLOCCULENT GALAXY NGC2841

机译:絮状星系NGC2841中的光滑暗螺旋臂

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OPTICAL, images of the arms of spiral galaxies invariably show massive blue stars forming in ridges of interstellar gas and dust(1). These are particularly striking in 'grand-design' galaxies, in which the stellar positions are influenced by spiral density waves(1). By contrast, many galaxies have a 'flocculent' appearance, with no obvious evidence of spiral structure at visible wave-lengths, Here we report infrared observations of the prototype flocculent galaxy NGC2841, which reveal a remarkable system of long, dark spiral arms, These arms arise from concentrations of dust; they are hidden at optical wavelengths by light scattered from the dust. The mechanism that has organized the gas and dust into these dark arms is at present unclear; the arms might be highly sheared dense clouds, or they might correspond to density waves in the interstellar medium driven by an elongated central bulge, which would not affect the stable stellar disk. [References: 30]
机译:光学上,旋涡星系臂的图像总是显示在星际气体和尘埃脊中形成大量的蓝色恒星(1)。这些在“大设计”星系中尤其引人注目,在这些星系中,恒星的位置受到螺旋密度波的影响(1)。相比之下,许多星系都具有“絮状”外观,在可见波长处没有明显的螺旋结构证据。在这里,我们报告了原型絮状星系NGC2841的红外观察结果,该星系显示了引人注目的长而深色的旋臂系统。手臂起因于灰尘的聚集;它们被尘埃散射的光隐藏在光波长处。目前尚不清楚将气体和尘埃组织到这些黑臂中的机制。这些臂可能是高度剪切的致密云,或者它们可能对应于由细长中央凸起驱动的星际介质中的密度波,这不会影响稳定的恒星盘。 [参考:30]

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