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Giant magnetized outflows from the centre of the Milky Way

机译:来自银河系中心的巨大磁化流出

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摘要

The nucleus of the Milky Way is known to harbour regions of intense star formation activity as well as a supermassive black hole. Recent observations have revealed regions of γ-ray emission reaching far above and below the Galactic Centre (relative to the Galactic plane), the so-called 'Fermi bubbles'. It is uncertain whether these were generated by nuclear star formation or by quasar-like outbursts of the central black hole and no information on the structures' magnetic field has been reported. Here we report observations of two giant, linearly polarized radio lobes, containing three ridge-like substructures, emanating from the Galactic Centre. The lobes each extend about 60 degrees in the Galactic bulge, closely corresponding to the Fermi bubbles, and are permeated by strong magnetic fields of up to 15 microgauss. We conclude that the radio lobes originate in a biconical, star-formation-driven (rather than black-hole-driven) outflow from the Galaxy's central 200 parsecs that transports a huge amount of magnetic energy, about 10~(55) ergs, into the Galactic halo. The ridges wind around this outflow and, we suggest, constitute a 'phonographic' record of nuclear star formation activity over at least ten million years.
机译:众所周知,银河系的核子拥有强烈的恒星形成活动区域以及超大质量的黑洞。最近的观测表明,γ射线的发射区域到达银河中心的上方和下方(相对于银河平面),即所谓的“费米气泡”。尚不确定这些是由核星的形成还是由中央黑洞的类星体爆发产生的,尚无关于该结构磁场的信息的报道。在这里,我们报告观测到来自银河中心的两个巨大的线性极化无线电波瓣,其中包含三个类似脊的子结构。每个叶片在银河凸起中延伸约60度,与费米泡非常接近,并被高达15微高斯的强磁场所渗透。我们得出的结论是,无线电波瓣起源于双圆锥形,由恒星形成驱动(而不是黑洞驱动)从银河系中心200帕秒的流中流出,该流将大量的磁能(约10〜(55)erg)传输到银河系的光环。洋脊围绕着流出的水流,我们建议在至少一千万年间构成核星形成活动的“唱片”记录。

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  • 来源
    《Nature》 |2013年第7430期|66-69|共4页
  • 作者单位

    CSIRO Astronomy and Space Science, PO Box 276, Parkes, New South Wales 2870, Australia;

    Max-Planck-lnstitut fur Kernphysik, PO Box 103980,69029 Heidelberg, Germany,Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, Australian Capital Territory 2611, Australia;

    International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, Western Australia 6009, Australia,ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), M468, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia;

    Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010,6500 GL Nijmegen, The Netherlands,Leiden Observatory, Leiden University, PO Box 9513,2300 RA Leiden, The Netherlands;

    Sydney Institute for Astronomy, School of Physics, The University of Sydney, New South Wales 2006, Australia;

    Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA;

    Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA;

    CSIRO Astronomy and Space Science, PO Box 76, Epping, New South Wales 1710, Australia;

    INAF Osservatorio Astronomico di Cagliari, Strada 54 Localita Poggio dei Pini, 1-09012 Capoterra (CA), Italy;

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