Search for High-Energy Gamma-ray Emission from an Anomalous X-ray Pulsar, 4U 0142+61
arXiv:1009.1279 · doi:10.1088/0004-637X/723/1/100
Abstract
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 (LAT) on board 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.
Published in ApJ
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- AXPs and SGRs in the outer gap model: confronting Fermi observations
- Observations of the magnetars 4U 0142+61 and 1E 2259+586 with the MAGIC telescopes
- Non-detection in a Fermi/LAT observation of AXP 4U 0142+61: magnetars?
- High energy gamma-ray emission from compact galactic sources in the context of observations with the next generation Cherenkov Telescope Arrays
- Classification of pulsars with Dirichlet process Gaussian mixture model
- Broadband X-ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937
- Hard X-ray emission cutoff in anomalous X-ray pulsar 4U 0142+61 detected by INTEGRAL
- To understand the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
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