Rossi X-Ray Timing Explorer observation of PSR B0656+14

被引:5
作者
Chang, HK [1 ]
Ho, C
机构
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30043, Taiwan
[2] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
pulsars : individual (PSR BO656+14); X-rays : stars;
D O I
10.1086/306583
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
PSR B0656 + 14 was observed by the Rossi X-Ray Timing Explorer (RXTE) with the proportional counter array (PCA) and the high-energy X-ray timing experiment (HEXTE) for 160 ks during 1997 August 22-September 3. No pulsation was firmly found in the timing analysis, during which the contemporaneous radio ephemeris and various statistical tests were applied in searching for evidence of pulsation. A marginal detection of pulsation at a confidence level of 95.5% based on the H test was found with data in the: whole HEXTE energy band, In the energy band of 2-10 keV the RXTE PCA upper limits are about 1 order of magnitude lower than that from ASCA GIS data. If the Compton Gamma Ray Observatory EGRET detection of this pulsar is real, considering the common trait that most EGRET-detected pulsars have a cooling spectrum in hard X-ray and gamma-ray energy bands, the estimated RXTE upper limits indicate a deviation (low-energy turnover) from a cooling spectrum starting from 20 keV or higher. This in turn suggests an outer magnetospheric synchrotron radiation origin For high-energy emissions from PSR B0656 + 14. The RXTE PCA upper limits also suggest that a reported power-law component based on ASCA SIS data in 1-10 keV fitted jointly with ROSAT data, if real, should be mainly unpulsed.
引用
收藏
页码:404 / 407
页数:4
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