天鹅座X区域XXIII。18 P87是银河系还是河外星系？
The Cygnus X region XXIII. Is 18P87 galactic or extragalactic?
摘要：
射电源18 P87，以前被认为是一个点源，已被偶然发现，以解决成一个核心喷流的几何形状在VLA地图。连续辐射的HI吸收（来自加拿大银道巡天的数据）出现在径向速度大于+2 km/s的气体中，但在较低径向速度的明亮辐射气体中则没有。对射电、红外线和光学波长的进一步档案观测的研究表明，作为一个射电星系的“明显”解释需要一个相当不寻常的这种天体和一个非常不寻常的局部视线。我们认为18 P87可能是一个银河系天体，一个局部的天体物理喷流。如果这是正确的，它可能是由微类星体的爆发产生的。
英文摘要：
The radio source 18P87, previously thought to be a point source, has been serendipitously found to be resolved into a core-jet geometry in VLA maps. HI absorption of continuum emission (in data from the Canadian Galactic Plane Survey) appears in gas with radial velocities > +2 km/s but not in brightly emitting gas at lower radial velocity. Examination of further archival observations at radio, infrared and optical wavelengths suggests that the "obvious" interpretation as a radio galaxy requires a rather unusual object of this kind and a highly unusual local line of sight. We argue that 18P87 may be a Galactic object, a local astrophysical jet. If this is correct it could have arisen from outbursts of a microquasar.
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