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朱雀号在2009年活动期间在磁星1 E 1547.0-5408的持久光谱中发现硬X射线尾

Suzaku Discovery of a Hard X-Ray Tail in the Persistent Spectra from the Magnetar 1E 1547.0-5408 during its 2009 Activity

Enoto Teruaki, Nakazawa Kazuhiro, Makishima Kazuo, Nakagawa E. Yujin, Sakamoto Takanori, Ohno Masanori, Takahashi Tadayuki, Terada Yukikatsu, Yamaoka Kazutaka, … 展开作者

Enoto Teruaki, Nakazawa Kazuhiro, Makishima Kazuo, Nakagawa E. Yujin, Sakamoto Takanori, Ohno Masanori, Takahashi Tadayuki, Terada Yukikatsu, Yamaoka Kazutaka, Murakami Toshio, Takahashi Hiromitsu

摘要:

旋转最快的磁星1 E 1547.0-5408于2009年1月28日至29日在其最近一次爆发活动开始后的7天,用朱雀的宽带X射线观测了33千秒。在去除爆发事件后,用XIS测量的持续发射的吸收未校正的2-10 keV通量为5.7e-11 ergs cm-2 s-1,这比2006年和2007年源不太活跃时测量的高1-2个数量级。HXD在>10 keV至至少~110 keV的能量范围内也能显著检测到持续发射,在20-100 keV的能量范围内甚至能检测到1.3e-10 ergs cm-2 s-1的更高通量。在2.072135+/-0.00005 s的周期内检测到至少高达70 keV的脉动,其调制比在较暗状态下测量的调制更深。相位平均的0.7-114 keV光谱通过吸收的黑体发射再现,温度为0.65+/-0.02 keV,加上光子指数为~1.5的硬幂律。在距离为9 kpc时,黑体的辐射热光度和2-100 keV的硬幂律光度分别为(6.2+/-1.2)e+35 ergs-1和1.9e+36 ergs-1,黑体半径为~5 km。虽然在过去较暗的状态下,在硬X射线中没有检测到显著的源,但是在低于10 keV的能量中,现在和过去的光谱的比较表明,在持续活动期间,硬分量比软X射线分量增强。

英文摘要:

The fastest-rotating magnetar 1E 1547.0-5408 was observed in broad-band X-rays with Suzaku for 33 ks on 2009 January 28-29, 7 days after the onset of its latest bursting activity. After removing burst events, the absorption-uncorrected 2-10 keV flux of the persistent emission was measured with the XIS as 5.7e-11 ergs cm-2 s-1, which is 1-2 orders of magnitude higher than was measured in 2006 and 2007 when the source was less active. The persistent emission was also detected significantly with the HXD in >10 keV up to at least ~110 keV, with an even higher flux of 1.3e-10 ergs cm-2 s-1 in 20-100 keV. The pulsation was detected at least up to 70 keV at a period of 2.072135+/-0.00005 s, with a deeper modulation than was measured in a fainter state. The phase-averaged 0.7-114 keV spectrum was reproduced by an absorbed blackbody emission with a temperature of 0.65+/-0.02 keV, plus a hard power-law with a photon index of ~1.5. At a distance of 9 kpc, the bolometric luminosity of the blackbody and the 2-100 keV luminosity of the hard power-law are estimated as (6.2+/-1.2)e+35 ergs s-1 and 1.9e+36 ergs s-1, respectively, while the blackbody radius becomes ~5 km. Although the source had not been detected significantly in hard X-rays during the past fainter states, a comparison of the present and past spectra in energies below 10 keV suggests that the hard component is more enhanced than the soft X-ray component during the persistent activity.

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