他们用由哈勃太空望远镜收集的光学信息数据和由esa的XMM -牛顿太空望远镜收集的x光数据来识别活跃星系。
They used data in the optical regime collected by the Hubble space telescope, as well as X-ray data collected by ESA's XMM-Newton space telescope to identify the active galaxies.
他们用由哈勃太空望远镜收集的光学信息数据和由esa的XMM -牛顿太空望远镜收集的x光数据来识别活跃星系。
They used data in the optical regime collected by the Hubble space telescope, as well as X-ray data collected by ESA's XMM-Newton space telescope to identify the active galaxies.
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