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MULTIWAVELENGTH OBSERVATIONS OF MARKARIAN 421 DURING A TeV/X-RAY FLARE

机译:TeV / X射线耀斑期间MARKARIAN 421的多波长观测

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摘要

A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. Other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.
机译:1994年5月,Whipple天文台的空中Cherenkov实验发现了BL Lac物体Mrk 421的TeV耀斑,在此期间,超过250 GeV的通量在2天的时间内增加了近一个数量级。 ASCA同时进行的观察表明,X射线通量处于很高的状态。我们介绍了这些结果,并结合了对这个最近的BL Lac物体的GeV伽玛射线,UV,IR,mm和无线电能的首次同时或几乎同时观测。尽管GeV伽马射线通量略有增加,但几乎没有证据表明变异性可与TeV和X射线能量所见的变异性相媲美。其他波长的可变性甚至更低。这对工作中的排放机制提供了重要的限制。我们介绍了这种γ射线blazar处于静止状态和燃烧状态的多波长光谱,并根据当前的blazar发射模型讨论了数据。

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