标题： 多波长观测VHE BL Lac天体 显示英文标题

标题： Multi-wavelength Observations of VHE BL Lac Objects

摘要： 我们展示了对非常高能(VHE, E >250 GeV)伽马射线源Mrk 421和Mrk 501的多波长观测。 这里提供的VHE数据是使用Whipple天文台10米伽马射线望远镜获得的。 在1995年4月至5月进行的Mrk 421观测活动中，观察到了VHE伽马射线、X射线、极紫外(EUV)以及可能的R波段辐射之间的相关性。 X射线和伽马射线一起变化，具有相似的通量幅度，而EUV光子比X射线和伽马射线滞后约1天，并且变化幅度较低。 在1997年4月进行的Mrk 501观测活动中，也观察到了VHE伽马射线和X射线之间的相关性，没有明显的延迟。 在这里，VHE伽马射线的变化大于X射线。 观测还表明同步加速器谱在截止前延伸到100 keV。 对于Mrk 421，X射线/VHE伽马射线的相关性表明delta > 38且B > 0.03G。 对于Mrk 501，相关性表明更温和的delta > 2且B > 0.09G。 显示英文摘要

摘要： We present multi-wavelength observations of the very high energy (VHE, E >250 GeV) gamma-ray sources Mrk 421 and Mrk 501. The VHE data presented here were taken with the Whipple Observatory 10m gamma-ray telescope. In the Mrk 421 campaign, conducted in 1995 April-May, correlations were observed between VHE gamma-ray, X-ray, extreme ultraviolet (EUV) and possibly R-band emission. The X-rays and gamma rays vary together with similar flux amplitude while the EUV photons lag the X-rays and gamma rays by ~1 day and have a lower variability amplitude. In the Mrk 501 campaign, conducted in 1997 April, a correlation was also observed between the VHE gamma rays and X-rays with no delays apparent. Here, the VHE gamma-ray variability is larger than the X-rays. The observations also indicate that the synchrotron spectrum extends to 100 keV before cutting off. For Mrk 421, the X-ray/VHE gamma-ray correlation indicates that delta > 38 and B > 0.03G. For Mrk 501, the correlation indicates a more modest delta > 2 and B > 0.09G.