Hier ist wahraveltig ein Loch im Himmel - The NGC 1999 dark globule is not a globule
Hier ist wahrhaftig ein Loch im Himmel - The NGC 1999 dark globule is not a globule
摘要：
NGC 1999反射星云的特征是一个约10，000 AU的暗斑，它被解释为一个小而密集的前景球状体，可能是即将形成的恒星。我们提出了赫歇尔PACS远红外70和160妈妈的地图，这揭示了在小球的位置通量赤字。我们估计产生这种吸收特性所需的小球质量为十分之几到几个Msun。受赫歇尔观测的启发，我们获得了APEX LABOCA和SABOCA亚毫米连续谱图，以及该地区的麦哲伦PANIC近红外图像。在赫歇尔通量衰减的位置，我们没有探测到亚毫米级的源;此外，我们的观测将球状体的质量上限定为~ 2.4 × 10 ^-2 Msun。事实上，亚毫米波的地图似乎也显示了通量的下降。此外，近红外图像检测到暗斑内比其周围受消光影响更小的微弱背景恒星。我们认为暗斑实际上是产生NGC 1999反射星云的物质中的一个洞或空腔，是由V 380 Ori多重系统的原恒星喷流挖掘出来的。
英文摘要：
The NGC 1999 reflection nebula features a dark patch with a size of ~10,000 AU, which has been interpreted as a small, dense foreground globule and possible site of imminent star formation. We present Herschel PACS far-infrared 70 and 160mum maps, which reveal a flux deficit at the location of the globule. We estimate the globule mass needed to produce such an absorption feature to be a few tenths to a few Msun. Inspired by this Herschel observation, we obtained APEX LABOCA and SABOCA submillimeter continuum maps, and Magellan PANIC near-infrared images of the region. We do not detect a submillimer source at the location of the Herschel flux decrement; furthermore our observations place an upper limit on the mass of the globule of ~2.4x10^-2 Msun. Indeed, the submillimeter maps appear to show a flux depression as well. Furthermore, the near-infrared images detect faint background stars that are less affected by extinction inside the dark patch than in its surroundings. We suggest that the dark patch is in fact a hole or cavity in the material producing the NGC 1999 reflection nebula, excavated by protostellar jets from the V 380 Ori multiple system.
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