标题： 多波段研究极端活动星系核J2310-437 显示英文标题

标题： A Multiwavelength Study of the Extreme AGN J2310-437

摘要： 我们展示了对于不同寻常的星系/团系统 J2310-437 的新 X 射线、无线电和光学数据。 我们的结果证实了存在一个活跃的核，并暗示将其解释为一种异常的 BL Lac 天体，整体相对论性 Doppler 因子 < 2，具有从无线电到 X 射线谱的光学缺陷。 无线电、光学和软 X 射线通量密度可能遵循单一的幂律函数，缺乏典型的 BL Lac 天体的曲率。 与其他可能具有可比较多频率谱的已知源相比， J2310-437 是最极端的。 它的各向同性的光学/紫外辐射低，这与外部光子通过康普顿冷却控制电子谱断点的强度一致；在这个源中，外部光子密度会太低，以至于无法在 X 射线以下产生谱断点。 显示英文摘要

摘要： We present new X-ray, radio, and optical data for the unusual galaxy/cluster system J2310-437. Our results confirm the presence of an active nucleus, and suggest an interpretation as an anomalous BL Lac object of bulk relativistic Doppler factor < 2, with an optically deficient radio-to-X-ray spectrum. The radio, optical, and soft X-ray flux densities could lie along a single power-law function, lacking the curvature typical of BL Lac objects. Compared with other known sources that may have comparable multifrequency spectra, J2310-437 is the most extreme. Its low isotropic optical/UV radiation is consistent with the intensity of external photons governing the electron spectral break through Compton cooling; in this source the external photon density would be too low to produce a spectral break below the X-ray.