We report the first arcsecond-resolution observations of the magnetic field in the ministarburst complex Sgr B2. SMA polarization observations revealed magnetic field morphology in three dense cores of Sgr B2 N(orth), M(ain), and S(outh). The total plane-of-sky magnetic field strengths in these cores are estimated to be 4.3–10.0 mG, 6.2–14.7 mG, and 1.9–4.5 mG derived from the angular dispersion function method after applying the correction factors of 0.21 and 0.5. Combining with analyses of the parsec-scale polarization data from Stratospheric Observatory for Infrared Astronomy, we found that a magnetically supercritical condition is present from the cloud scale (∼10 pc) to core scale (∼0.2 pc) in Sgr B2, which is consistent with the burst of star formation activities in the region likely resulting from a multiscale gravitational collapse from the cloud to dense cores.

中文翻译：

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迷你星爆复合体 Sgr B2 中的磁场


我们报告了对小型星暴复合体 Sgr B2 中磁场的首次角秒分辨率观测。 SMA 极化观测揭示了 Sgr B2 N（orth）、M（ain）和 S（outh）三个致密核心的磁场形态。在应用0.21和0.5的校正因子后，根据角色散函数方法推导出这些核心的总天空平面磁场强度估计为4.3-10.0 mG、6.2-14.7 mG和1.9-4.5 mG​​。结合平流层红外天文台秒差距尺度偏振数据分析，我们发现人马座B2从云尺度（~10 pc）到核心尺度（~0.2 pc）都存在磁超临界条件，这与该区域恒星形成活动的爆发可能是由从星云到致密核心的多尺度引力塌缩造成的。