Search for high-energy gamma-ray emission from an anomalous x-ray pulsar, 4U 0142+61
Muş, Sinem Şaşmaz and Göğüş, Ersin (2010) Search for high-energy gamma-ray emission from an anomalous x-ray pulsar, 4U 0142+61. Astrophysical Journal, 723 (1). pp. 100-103. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1088/0004-637X/723/1/100
Until 2004, anomalous X-ray pulsars (AXPs) were known as strong emitters of soft X-rays only (<10 keV). The discovery of hard X-ray component from AXPs provided important insight about their emission properties while it posed a serious challenge to explain its origin. The physical mechanism of the hard emission component has still not been fully resolved. We investigate the high-energy gamma-ray properties of the brightest AXP, 4U 0142+61, using data collected with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope to establish the spectral behavior of the source on a very broad energy span and search for pulsed emission. Here, we present our results of detailed search for the persistent and pulsed high-energy gamma-ray emission from 4U 0142+61 which result in no significant detection. However, we obtain upper limits to the persistent high-energy gamma-ray emission flux which helps us to constrain existing physical models.
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