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ATCA radio imaging of the ProPlyD-like objects in the giant HII region NGC 3603

机译：aTCa巨型HII区域中类似proplyD的物体的无线电成像  NGC 3603

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摘要

Three cometary-shaped objects in the giant HII region NGC 3603, originallyfound and identified as proto-planetary disks (ProPlyDs) by Brandner et al.2000 using HST+VLT in the optical and near-infrared, have been detected withthe Australia Telescope Compact Array (ATCA) in the radio continuum at 3 and6cm. All three ProPlyD-like objects are clearly resolved with an extent of afew arcseconds. The integrated 6cm fluxes are up to 1.3 times higher than the3cm fluxes with spectral indices averaged over the whole clump between$lpha=-0.1$ and -0.5 ($S_u propto u^{lpha}$), indicating the likelypresence of non-thermal emission in at least some of the sources. All measuredfluxes are at least one order of magnitude higher than those predicted byBrandner et al. 2000. Due to the unexpectedly large radio luminosities of theProPlyD-like features and because the radio emission is extended a(proto-)stellar origin of the non-thermal emission from a dust enshrouded starappears unlikely. Instead we propose that magnetized regions within theenvelope of the ProPlyD-like nebulae exist. (abridged)
机译：在澳大利亚HII区域NGC 3603中，三个彗星状物体最初是由Brandner等人2000年发现并鉴定为原行星盘（ProPlyDs），使用的是HST + VLT在光学和近红外中，已通过澳大利亚望远镜紧凑阵列检测到（ATCA）在3和6厘米的无线电连续体中。所有三个类似于ProPlyD的对象都可以在几弧秒内清晰地分辨出来。积分的6cm通量比3cm通量高1.3倍，光谱指数在整个簇中平均为$ alpha = -0.1 $和-0.5（$ S_ nu propto nu ^ { alpha} $），表明至少某些来源可能存在非热辐射。所有测得的通量比Brandner等人的预测至少高一个数量级。 2000。由于类似ProPlyD的特征具有惊人的大光度，并且由于射电范围扩大，因此不太可能出现由尘埃包裹星体产生的非（原）星状起源的非热辐射。相反，我们建议在ProPlyD状星云的包络内存在磁化区域。 （简略）

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