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钱德拉和海珊超新星遗迹CTB 37 B

Chandra and H.E.S.S. observations of the Supernova Remnant CTB 37B

HESS Collaboration, F. Aharonian

摘要:

100 GeV以上的伽马射线源HESS J1713-381,显然与壳型超新星遗迹CTB 37 B有关,是使用HESS发现的。图:2006年钱德拉的X射线跟踪观测于2007年进行,目的是确定TeV源的同步加速器对应物和/或SNR壳的热发射。这些新的钱德拉数据,加上额外的TeV数据,使我们能够比以前更详细地研究这个对象的性质。新的X射线数据揭示了来自CTB 37 B射电壳层附近~4'区域的热辐射。这种排放的温度意味着残留物的年龄约为5000年,周围气体密度约为0.5 cm-3。这两个估计是相当不确定的,由于SNR的不对称性和可能的修改的运动学由于有效的宇宙射线(CR)加速。在射电壳层还发现了一个明亮的(~ 7 × 10 ~(-13)erg cm ~(-2)s ~(-1))和未分辨的(<1“)源(CX171405.7 -381031),它的非热谱较软(~3.3)。吸收表明柱密度与壳的热发射一致,表明真正的关联而不是偶然的对齐。所观察到的TeV形态与CTB 37 B完整壳中的起源一致。缺乏弥散的非热X射线发射表明伽马射线发射的起源是通过质子和原子核相互作用中产生的中性π介子的衰变,而不是相对论电子的逆康普顿(IC)发射。

英文摘要:

The >100 GeV gamma-ray source, HESS J1713-381, apparently associated with the shell-type supernova remnant (SNR) CTB 37B, was discovered using H.E.S.S. in 2006. X-ray follow-up observations with Chandra were performed in 2007 with the aim of identifying a synchrotron counterpart to the TeV source and/or thermal emission from the SNR shell. These new Chandra data, together with additional TeV data, allow us to investigate the nature of this object in much greater detail than was previously possible. The new X-ray data reveal thermal emission from a ~4' region in close proximity to the radio shell of CTB 37B. The temperature of this emission implies an age for the remnant of ~5000 years and an ambient gas density of ~0.5 cm-3. Both these estimates are considerably uncertain due to the asymmetry of the SNR and possible modifications of the kinematics due to efficient cosmic ray (CR) acceleration. A bright (~7x10-13erg cm-2s-1) and unresolved (<1'') source (CXOU J171405.7-381031) with a soft (Γ~3.3) non-thermal spectrum is also detected in coincidence with the radio shell. Absorption indicates a column density consistent with the thermal emission from the shell suggesting a genuine association rather than a chance alignment. The observed TeV morphology is consistent with an origin in the complete shell of CTB 37B. The lack of diffuse non-thermal X-ray emission suggests an origin of the gamma-ray emission via the decay of neutral pions produced in interactions of protons and nuclei, rather than inverse Compton (IC) emission from relativistic electrons.

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