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arXiv 0910.0150astro-ph.GA
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6.7GHz甲醇脉泽的三角视差

Trigonometric Parallaxes of 6.7 GHz Methanol Masers

K. L. J. Rygl, A. Brunthaler, M. J. Reid, K. M. Menten, H. J. van Langevelde, Y. Xu

摘要:

从6.7 GHz的甲醇脉泽过渡的排放是非常强的,是相对稳定的,有小的内部运动,并观察到对许多大规模的恒星形成区域在银河系。我们的目标是利用这种脉泽跃迁进行高精度的天体测量,以获得到它们所在区域的精确距离。在2006年6月至2008年3月期间,欧洲VLBI网络在五个VLBI观测时期观测到了八个强脉泽。我们报告五个恒星形成区的三角函数,精度与$\sim22 \mathrmμ$一样好。到这些源的距离是ON 1的$2.57^{+0.34}_{-0.27}$ kpc、L 1206的$0.776^{+0.104}_{-0.083}$ kpc、L 1287的$0.929^{+0.034}_{-0.033}$ kpc、NGC 281-W的$2.38^{+0.13}_{-0.12}$ kpc和S 255的$1.59^{+0.07}_{-0.06}$ kpc。的距离和自行产生的恒星形成的区域托管的脉泽的全空间运动,我们发现,这些地区滞后的平均$\sim$ 17公里的$^{-1}$,值相当于最近发现的类似研究的圆周旋转。

英文摘要:

Emission from the 6.7 GHz methanol maser transition is very strong, is relatively stable, has small internal motions, and is observed toward numerous massive star-forming regions in the Galaxy. Our goal is to perform high-precision astrometry using this maser transition to obtain accurate distances to their host regions. Eight strong masers were observed during five epochs of VLBI observations with the European VLBI Network between 2006 June, and 2008 March. We report trigonometric parallaxes for five star-forming regions, with accuracies as good as $\sim22 \mathrmμ$as. Distances to these sources are $2.57^{+0.34}_{-0.27}$ kpc for ON 1, $0.776^{+0.104}_{-0.083}$ kpc for L 1206, $0.929^{+0.034}_{-0.033}$ kpc for L 1287, $2.38^{+0.13}_{-0.12}$ kpc for NGC 281-W, and $1.59^{+0.07}_{-0.06}$ kpc for S 255. The distances and proper motions yield the full space motions of the star-forming regions hosting the masers, and we find that these regions lag circular rotation on average by $\sim$17 km s$^{-1}$, a value comparable to those found recently by similar studies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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