arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.00592astro-ph.GA
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由W43分子复合体中沿4-kpc臂的CO线泡揭示的暗超新星遗迹

Dark Supernova Remnants revealed by CO-line Bubbles in the W43 Molecular Complex along the 4-kpc Arm

Yoshiaki Sofue

摘要:

利用高角分辨率($20''\sim 0.5$ pc)和高速度分辨率(1.3 km/s)的FUGIN $^*$ CO线巡天(用45米Nobeyama望远镜进行的$^*$四接收器系统无偏银河成像巡天)分析了W 43(G31+00+90 km/s,$\sim 5.5$ kpc)周围巨分子云(GMC)密度分布的精细结构。的GMCs显示出高度湍流结构,涡被发现表现出球形气泡形态出现在狭窄范围内的速度通道。这些气泡在射电连续辐射中是黑暗的,不像通常的超新星遗迹(SNR)或HII区域,在红外尘埃辐射中也是黑暗的,不像年轻恒星周围的分子气泡。CO气泡被解释为由于充分发展的埋在分子云的SNR后,在密集的分子云释放的能量迅速耗尽。CO气泡可能是SN起源激发和维持GMC湍流的直接证据。寻找CO气泡作为“暗信噪比”(dSNR)将有助于更准确地估计超新星的速率,从而更准确地估计银河系中的恒星形成活动。

英文摘要:

Fine structure of the density distribution in giant molecular clouds (GMC) around W43 (G31+00+90 km/s at $\sim 5.5$ kpc) was analyzed using the FUGIN$^*$ CO-line survey at high-angular ($20''\sim 0.5$ pc) and velocity (1.3 km/s) resolutions ($^*$Four-receiver-system Unbiased Galactic Imaging survey with the Nobeyama 45-m telescope). The GMCs show highly turbulent structures, and the eddies are found to exhibit spherical bubble morphology appearing in narrow ranges of velocity channels. The bubbles are dark in radio continuum emission, unlike usual supernova remnants (SNR) or HII regions, and in infrared dust emission, unlike molecular bubbles around young stellar objects. The CO bubbles are interpreted as due to fully evolved buried SNRs in molecular clouds after rapid exhaustion of the released energy in dense molecular clouds. The CO bubbles may be a direct evidence for exciting and maintaining the turbulence in GMCs by SN origin. Search for CO bubbles as "dark SNRs" (dSNR) will have implication to estimate the supernova rate more accurately, and hence the star formation activity in the Milky Way.

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