在与位于Westerlund 1方向的H.E.S.S gamma-ray源相关的Norma近臂中发现分子空腔
The discovery of a molecular cavity in the Norma near arm associated to H.E.S.S gamma-ray source located in the direction of Westerlund 1
摘要：
我们报告了在诺玛近臂中发现的一个分子空腔，该空腔的平均径向速度为-91.5 km ^{-1}，与Wd 1恒星的平均径向速度相差约40 km ^{-1}。空腔周围是一个外径约为100 pc和10^{6} M_odot的碎片分子壳层，它以6 ~ 8 km ^{-1}的速度膨胀。膨胀的壳层所涉及的动能为~10^{51}尔格。在这个腔中，原子HI气体的表面密度也是最低的。最近由H.E.S.S.报告的扩展甚高能（VHE）伽马射线发射的结构。合作欧姆等人2009年，符合腔。观测到的形态表明，分子壳的内壁是伽马射线发射区，而不是像H.E.S.S. S推测的那样，是围绕Wd 1大质量恒星的致密气体。协作一个可能的候选者负责创建观察到的空腔和伽马射线发射是脉冲星PSR J1648-4611。
英文摘要：
We report on the discovery of a molecular cavity in the Norma near arm in the general direction of Westerlund 1 (Wd1), but not associated with it. The cavity has a mean radial velocity of -91.5 kms^{-1}, which differs by as much as ~40 kms^{-1} from the mean radial velocity of the Wd1 stars. The cavity is surrounded by a fragmented molecular shell of an outer diameter of about 100 pc and 10^{6} M_odot, which is expanding at velocities of 6 to 8 kms^{-1}. The amount of kinetic energy involved in the expanding shell is ~10^{51} erg. Inside this cavity the atomic HI gas surface density is also the lowest. Structure of the extended Very High Energetic (VHE) gamma-ray emission, recently reported by the H.E.S.S. collaboration Ohm et al. 2009, coincides with the cavity. The observed morphology suggests that the inner wall of the molecular shell is the zone of the gamma-ray emission, and not the dense gas surrounding massive stars of Wd1 as had been speculated by the H.E.S.S. collaboration. A likely candidate responsible for creating the observed cavity and the gamma-ray emission is the pulsar PSR J1648-4611.
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