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DETECTION OF THE BL LACERTAE OBJECT H1426+428 AT TeV GAMMA-RAY ENERGIES

机译:在TeV伽马射线能量中检测BL花边眼对象H1426 + 428

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摘要

A very high energy γ-ray signal has been detected at the 5.5 σ level from H1426+428, an X-ray-selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 to 1998 with the Whipple 10 m imaging atmospheric Cerenkov telescope as part of a general blazar survey; the results of these observations, although not statistically significant, were consistently positive. X-ray observations of H1426+428 during 1999 with the BeppoSAX instrument revealed that the peak of its synchrotron spectrum occurs at greater than 100 keV, leading to the prediction of observable TeV emission from this object. H1426+428 was monitored extensively at the Whipple Observatory during the 1999, 2000, and 2001 observing seasons. The strongest TeV signals were detected in 2000 and 2001. During 2001, an integral flux of 2.04 +- 0.35 x 10~(-11) cm~(-2) s~(-1) above 280 GeV was recorded from H1426+428. The detection of H1426+428 supports the idea that, as also seen in Mrk 501 and 1ES 2344+514, BL Lacertae objects with extremely high synchrotron peak frequencies produce γ-rays in the TeV range.
机译:从H1426 + 428(X射线选择的BL Lacertae物体,红移0.129)处以5.5σ的水平检测到非常高能量的γ射线信号。从1995年至1998年,使用Whipple 10 m大气Cerenkov望远镜对天体进行了监测,这是一般blazar调查的一部分。这些观察结果尽管没有统计学意义,但始终是积极的。在1999年用BeppoSAX仪器对H1426 + 428进行的X射线观察表明,其同步加速器光谱的峰值出现在大于100 keV处,从而预测了该物体可观测到的TeV发射。在1999、2000和2001年的观测季节中,Whipple天文台对H1426 + 428进行了广泛的监测。在2000年和2001年检测到最强的TeV信号。在2001年期间,从H1426 + 428记录到280 GeV以上的积分通量为2.04 +-0.35 x 10〜(-11)cm〜(-2)s〜(-1)。 。对H1426 + 428的检测支持了这样的想法,正如在Mrk 501和1ES 2344 + 514中所看到的那样,同步加速器峰值频率极高的BL Lacertae对象产生了TeV范围内的γ射线。

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