Alpha Ori附近ISM-风弓形激波的AKARI/FIS绘图
AKARI/FIS Mapping of the ISM-Wind Bow Shock around Alpha Ori
摘要：
我们目前的10'x50'扫描地图M超巨星阿尔法猎户座在65，90，140和160微米获得的AKARI红外天文卫星。具有精确解析解的更高空间分辨率的数据使我们能够拟合出猎户座阿尔法星周围恒星风弓形激波的反投影形状，使其具有4.8 '的距离，55度的位置角和56度的倾角。弓形激波的形状表明，猎户座α相对于当地介质的特有速度为v_* = 40（n_H）^（-1/2），其中n_H为猎户座α处的氢核密度。在假设局部介质正远离猎户座OB 1星协的情况下，利用猎户座阿尔法星最新的天体测量解，我们发现局部介质的n_H = 1.5 ~ 1.9 cm^（-3），局部流的速度为11 km s^（-1）。AKARI的图像也可能揭示出一个涡环，这是由于数值模型所证明的弓形激波表面的不稳定性造成的。这项研究证实了AKARI全天数据以及赫歇尔太空望远镜和平流层红外天文台的后续观测的潜力，以揭示恒星风和星际介质之间相互作用的性质。
英文摘要：
We present 10' x 50' scan maps around an M supergiant Alpha Ori at 65, 90, 140 and 160 microns obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution permit us to fit the de-projected shape of the stellar wind bow shock around Alpha Ori to have the stand-off distance of 4.8', position angle of 55 degrees and inclination angle of 56 degrees. The shape of the bow shock suggests that the peculiar velocity of Alpha Ori with respect to the local medium is v_* = 40 (n_H)^(-1/2), where n_H is the hydrogen nucleus density at Alpha Ori. We find that the local medium is of n_H = 1.5 to 1.9 cm^(-3) and the velocity of the local flow is at 11 km s^(-1) by using the most recent astrometric solutions for Alpha Ori under the assumption that the local medium is moving away from the Orion OB 1 association. AKARI images may also reveal a vortex ring due to instabilities on the surface of the bow shock as demonstrated by numerical models. This research exemplifies the potential of AKARI All-Sky data as well as follow-up observations with Herschel Space Telescope and Stratospheric Observatory for Infrared Astronomy for this avenue of research in revealing the nature of interaction between the stellar wind and interstellar medium.
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