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A 300-parsec-long jet-inflated bubble around a powerful microquasar in the galaxy NGC 7793

机译：NGC 7793中一个强大的微类星体周围的300帕秒长的喷气气泡

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摘要

Black-hole accretion states near or above the Eddington luminosity (the point at which radiation force outwards overcomes gravity) are still poorly known because of the rarity of such sources. Ultraluminous X-ray sources are the most luminous class of black hole (L_x ≈ 10~(40) erg s~(-1)) located outside the nuclei of active galaxies. They are likely to be accreting at super-Eddington rates, if they are powered by black holes with masses less than 100 solar masses. They are often associated with shock-ionized nebulae, though with no evidence of collimated jets. Microquasars with steady jets are much less luminous. Here we report that the large nebula S26 (ref. 4) in the nearby galaxy NGC 7793 is powered by a black hole with a pair of collimated jets. It is similar to the famous Galactic source SS433 (ref. 5), but twice as large and a few times more powerful. We determine a mechanical power of around a few 10~(40) erg s~(-1). The jets therefore seem 10~4 times more energetic than the X-ray emission from the core. S26 has the structure of a Fanaroff-Riley type II (FRII-type) active galaxy: X-ray and optical core, X-ray hot spots, radio lobes and an optical and X-ray cocoon. It is a microquasar where most of the jet power is dissipated in thermal particles in the lobes rather than relativistic electrons.
机译：由于这种光源的稀有性，人们几乎不了解在爱丁顿光度附近或之上的黑洞积聚状态（向外的辐射力克服重力的点）。超发光X射线源是位于活动星系原子核外部的最发光的黑洞类（L_x≈10〜（40）erg s〜（-1））。如果它们由质量小于100太阳质量的黑洞提供动力，它们很可能以超级爱丁顿速率生长。它们通常与电离星云有关，尽管没有准直射流的迹象。具有稳定射流的微类星体的发光要少得多。在这里，我们报告说，附近星系NGC 7793中的大型星云S26（参考文献4）由黑洞和一对准直射流驱动。它类似于著名的Galactic信号源SS433（参考资料5），但大小却是原来的两倍，功能却要强几倍。我们确定的机械功率约为10〜（40）erg s〜（-1）。因此，射流的能量似乎比岩心发射的X射线高10到4倍。 S26具有Fanaroff-Riley II型（FRII型）活性星系的结构：X射线和光学核，X射线热点，无线电波瓣以及光学和X射线茧。它是微类星体，其中大部分射流功率散发在波瓣中的热粒子中，而不是相对论性电子中。

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  • 来源
    《Nature》 |2010年第7303期|P.209-212|共4页
  • 作者

    Manfred W. Pakull; rnRoberto Soria; rnChristian Motch;

  • 作者单位

    University of Strasbourg, CNRS UMR 7550, Observatoire Astronomique, 11 rue de l'Universite, F67000 Strasbourg, France;

    rnMSSL, University College London, Holmbury St Mary, Surrey RH5 6NT, UK;

    rnUniversity of Strasbourg, CNRS UMR 7550, Observatoire Astronomique, 11 rue de l'Universite, F67000 Strasbourg, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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