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arXiv 1509.03090astro-ph.HE
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H.E.S.S. PSR B1259-63在2014年通过近星点期间的观测

H.E.S.S. observations of PSR B1259-63 during its 2014 periastron passage

C. Romoli, P. Bordas, C. Mariaud, T. Murach, F. Aharonian, M. de Naurois, G. Pühlhofer, U. Schwanke, B. van Soelen, I. Sushch, V. Zabalza

摘要:

利用H.E.S.S.对γ射线双星系统PSR B 1259 $-$ 63进行了扩展观测。(High 2014年,能量立体系统II在系统的近星点通过期间的5个望远镜阵列。我们报告的结果,这场运动,其中包括超过85小时的数据,涵盖前和后的近星轨道阶段。高能传感器的能量阈值较低。II阵列允许从PSR B1259 $-$ 63发射的非常高能量(VHE; $E \gtrsim 100$ GeV)伽马射线首次被研究到200 GeV。新的数据集与之前的H.E.S.S.部分重叠,并在阶段上进行了扩展。在2004年、2007年和2011年对这一来源开展了一系列活动,以便对VHE的通量水平进行详细的长期表征。此外,这里报告的2014年活动包括在精确的近星点时间$t_{\rm per}$期间的VHE观测,以及与费米LAT探测到的伽马射线耀斑同时采集的数据。我们的研究结果将在多波长的情况下进行讨论,由于密集的宽带监测活动进行的系统在这最后一次近星通过。

英文摘要:

An extended observation campaign of the gamma-ray binary system PSR B1259$-$63 has been conducted with the H.E.S.S. (High Energy Stereoscopic System) II 5-telescope array during the system's periastron passage in 2014. We report on the outcome of this campaign, which consists of more than 85 h of data covering both pre- and post-periastron orbital phases. The lower energy threshold of the H.E.S.S. II array allows very-high-energy (VHE; $E \gtrsim 100$ GeV) gamma-ray emission from PSR B1259$-$63 to be studied for the first time down to 200 GeV. The new dataset partly overlaps with and extends in phase previous H.E.S.S. campaigns on this source in 2004, 2007 and 2011, allowing for a detailed long-term characterisation of the flux level at VHEs. In addition, the 2014 campaign reported here includes VHE observations during the exact periastron time, $t_{\rm per}$, as well as data taken simultaneously to the gamma-ray flare detected with the Fermi-LAT. Our results will be discussed in a multiwavelength context, thanks to the dense broad-band monitoring campaign conducted on the system during this last periastron passage.

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