arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.6032astro-ph.HEastro-ph.GA
收藏

老脉冲星PSR B1451-68的Chandra观测

Chandra observations of the old pulsar PSR B1451-68

B. Posselt, G. G. Pavlov, R. N. Manchester, O. Kargaltsev, G. P. Garmire

摘要:

本文介绍了4200万年前射电脉冲星PSR B1451-68的35 kS钱德拉ACIS观测结果。在距离预期射电脉冲星位置0.32”+/- 0.73”处探测到一个点源。它在0.3-8 keV能量范围内有约200个计数。我们确定这个点源的X射线对应的无线电脉冲星。PSR B1451-68位于一个2 MASS点源附近,我们推导出7%作为通量对测量脉冲星X射线通量贡献的上限。脉冲星光谱可以用光子指数Gamma=2.4的幂律模型来描述(+0.4/-0.3)和不切实际的高吸收柱密度N(H)=(2.5(+1.2/-1.3))* 10^(21)cm^-2,或通过kT=0.35的组合(+0.12/-0.07)keV的黑体和伽马= 1.4 +/-0.5的幂律分量,N(H)[DM]= 2.6 * 10^(20)cm^-2,由脉冲星色散测量估算。在480 pc的视差、Lutz-Kelker偏差校正距离处,0.3-8 keV能带的非热X射线光度分别为Lx(nonth)=(11.3 +/- 1.7)* 10^(29)erg/s或Lx(nonth)=(5.9(+4.9/-5.0))* 10^(29)erg/s。这分别对应于eta(nonth)= Lx(nonth)/(dE/dt)~ 0.005或0.003的非热X射线效率。

英文摘要:

We present 35 ks Chandra ACIS observations of the 42 Myr old radio pulsar PSR B1451-68. A point source is detected 0.32" +/- 0.73" from the expected radio pulsar position. It has ~200 counts in the 0.3-8 keV energy range. We identify this point source as the X-ray counterpart of the radio pulsar. PSR B1451-68 is located close to a 2MASS point source, for which we derive 7% as the upper limit on the flux contribution to the measured pulsar X-ray flux. The pulsar spectrum can be described by either a power-law model with photon index Gamma=2.4 (+0.4/-0.3) and a unrealistically high absorbing column density N(H)= (2.5 (+1.2/-1.3)) * 10^(21) cm^-2, or by a combination of a kT=0.35 (+0.12/-0.07) keV blackbody and a Gamma = 1.4 +/- 0.5 power-law component for N(H)[DM]= 2.6 * 10^(20) cm^-2, estimated from the pulsar dispersion measure. At the parallactic, Lutz-Kelker bias corrected distance of 480 pc, the non-thermal X-ray luminosities in the 0.3-8 keV energy band are either Lx(nonth)= (11.3 +/- 1.7) * 10^(29) erg/s or Lx(nonth)= (5.9 (+4.9/-5.0)) * 10^(29) erg/s, respectively. This corresponds to non-thermal X-ray efficiencies of either eta(nonth)= Lx(nonth) / (dE/dt) ~ 0.005 or 0.003, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑