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INTENSE RADIO OUTBURST FROM THE SUPERMASSIVE STAR η CARINAE

机译:超大质量恒星η的强烈无线电爆发

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On five occasions between 1992 June 29 and 1994 May 3, we have used the Australia Telescope Compact Array to image η Carinae at a wavelength of 3 cm and a resolution of 1″. These observations have revealed remarkable activity. Since 1992 June, the total flux density has increase from 0.8 to 2.2 Jy, and the original single compact source has grown to a complex of sources spread over an area of about 16 arcsec~2 (Fig. 1). Strong hydrogen recombination-line spectral emission has appeared at the site of the strongest of these new sources. This recombination emission has the largest spectral width ever observed from a star, ±250 km s~(-1), and reveals gas with turbulent velocities as great as 250 km s~(-1) approaching us at an average velocity of about 200 km s~(-1). We believe that this radio outburst has been caused by a more than threefold increase of ultraviolet luminosity, and consequent ionization of previously neutral gas clouds.
机译:在1992年6月29日至1994年5月3日之间的五次中,我们使用了澳大利亚望远镜紧凑阵列对3个波长和1英寸分辨率的ηCarinae进行成像。这些观察显示出了惊人的活动。自1992年6月以来,总通量密度已从0.8 Jy增加到2.2 Jy,原始的单一致密源已发展成分布在约16 arcsec〜2范围内的复杂源(图1)。在这些新能源中最强的位置出现了强烈的氢复合线光谱发射。这种重组发射具有从恒星观测到的最大光谱宽度,为±250 km s〜(-1),并且揭示出湍流速度高达250 km s〜(-1)的气体以约200的平均速度接近我们公里s〜(-1)。我们认为,这种无线电爆发是由于紫外线发光度增加了三倍以上,以及随之而来的先前中性的气体云被电离所致。

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