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An origin of the radio jet in M87 at the location of the central black hole

机译：M87无线电射流的起源，位于中心黑洞的位置

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摘要

Powerful radio jets from active galactic nuclei are thought to be powered by the accretion of material onto the supermassive black hole (the 'central engine')~(1'2). M87 is one of the closest examples of this phenomenon, and the structure of its jet has been probed on a scale of about 100 Schwarzschild radii (R_s, the radius of the event horizon)~3. However, the location of the central black hole relative to the jet base (a bright compact radio 'core') remains elusive~(4,5). Observations of other jets indicate that the central engines are located about 10~4-10~6R_s upstream from the radio core~(6,9). Here we report radio observations of M87 at six frequencies that allow us to achieve a positional accuracy of about 20 microarcseconds. As the jet base becomes more transparent at higher frequencies, the multifrequency position measurements of the radio core enable us to determine the upstream end of the jet. The data reveal that the central engine of M87 is located within 14-23 R_S of the radio core at 43 GHz. This implies that the site of material infall onto the black hole and the eventual origin of the jet reside in the bright compact region seen on the image at 43 GHz.
机译：来自活动星系核的强大射流被认为是由物质在超大质量黑洞（“中央引擎”）〜（1'2）上的积聚提供动力的。 M87是这种现象的最接近的例子之一，其射流的结构已在约100 Schwarzschild半径（R_s，事件视界的半径）〜3的尺度上进行了探测。然而，中心黑洞相对于喷气机底座（明亮的紧凑型无线电“核心”）的位置仍然难以捉摸（4，5）。对其他喷气机的观测表明，中央引擎位于无线电核心（6,9）上游约10〜4-10〜6R_s。在这里，我们报告了在六个频率上对M87的无线电观测，这些观测使我们能够获得约20微秒的定位精度。随着射流基座在更高频率下变得更加透明，无线电核心的多频位置测量使我们能够确定射流的上游端。数据显示，M87的中央引擎位于43 GHz无线电核心的14-23 R_S范围内。这意味着物质进入黑洞的位置和射流的最终原点位于在43 GHz图像上看到的明亮紧凑区域中。

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  • 来源
    《Nature》 |2011年第7363期|p.185-187|共3页
  • 作者

    Kazuhiro Hada; Akihiro Doi; Motoki Kino; Hiroshi Nagai; Yoshiaki Hagiwara; Noriyuki Kawaguchi;

  • 作者单位

    Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;

    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan Department of Space and Astronautical Science, The Graduate University for Advanced Studies (SOKENDAI), 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan;

    National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;

    National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan;

    Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;

    Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;

  • 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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