A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
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DOI：
10.1038/s41586-019-1686-1
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发表时间：
2019-10
期刊：
影响因子：
64.8
通讯作者：
D. Rupke;A. Coil;J. Geach;C. Tremonti;A. Diamond-Stanic;E. George;R. Hickox;A. Kepley;G. Leung;J. Moustakas;G. Rudnick;P. Sell
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文献类型：
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作者：
D. Rupke;A. Coil;J. Geach;C. Tremonti;A. Diamond-Stanic;E. George;R. Hickox;A. Kepley;G. Leung;J. Moustakas;G. Rudnick;P. Sell
百分之九十的重子位于星系外，要么在环星系或星系际介质中。理论指出，银河风是丰富而巨大的环银河系介质的主要来源。来自致密星爆的风已经被观测到流动到略大于10千秒差距的距离，但环星系介质通常延伸到100千秒差距以上。在这里，我们报告的大质量，但紧凑的星系SDSS J211824.06+001729.4的光学积分场观测。波长为3726埃和3729埃的氧[Oii]线显示了一个跨越80 × 100平方千秒差距的电离流出物，在10，000开尔文的温度下通过一个沙漏形星云沉积富含金属的气体，该星云类似于一个抽空和边缘增亮的双极气泡。我们还观察到温度低于10，000开尔文的中性气相，达到20千秒差距的距离和每秒约1，500公里的速度。这种多相外流可能是由星星形成的爆发驱动的，与理论一致。
Ninety per cent of baryons are located outside galaxies, either in the circumgalactic or intergalactic medium,. Theory points to galactic winds as the primary source of the enriched and massive circumgalactic medium, , –. Winds from compact starbursts have been observed to flow to distances somewhat greater than ten kiloparsecs, , –, but the circumgalactic medium typically extends beyond a hundred kiloparsecs,. Here we report optical integral field observations of the massive but compact galaxy SDSS J211824.06+001729.4. The oxygen [Oii] lines at wavelengths of 3726 and 3729 angstroms reveal an ionized outflow spanning 80 by 100 square kiloparsecs, depositing metal-enriched gas at 10,000 kelvin through an hourglass-shaped nebula that resembles an evacuated and limb-brightened bipolar bubble. We also observe neutral gas phases at temperatures of less than 10,000 kelvin reaching distances of 20 kiloparsecs and velocities of around 1,500 kilometres per second. This multi-phase outflow is probably driven by bursts of star formation, consistent with theory,.