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On the infrared, optical, and high-energy emission from the anomalous X-ray pulsar 4U 0142+61
被引:28
作者:
Ertan, Ü
Cheng, KS
机构:
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Sabanci Univ, TR-34956 Istanbul, Turkey
关键词:
accretion;
accretion disks;
pulsars : individual (4U 0142+61);
stars : neutron;
X-rays : bursts;
D O I:
10.1086/382502
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We show that the observed pulsed optical emission of the anomalous X-ray pulsar 4U 0142+61 can be accounted for by both the magnetar outer gap models and the disk-star dynamo gap models; therefore, there is no evidence favoring only one of these models as its responsible mechanism. Nevertheless, the estimated high-energy gamma-ray spectra from these models have different power-law indices and can be tested by future observations with the Gamma-Ray Large Area Space Telescope (GLAST). Furthermore, we show by analytical estimations that the expectations of a standard disk model are in agreement with the observed unpulsed optical and infrared luminosities of the AXP 4U 0142+61.
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页码:840 / 845
页数:6
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