2010/09/30 by Sinem Sasmaz Mus, Sinem Şaşmaz Muş, Ersin Göğüş +1 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Component (thermodynamics) #Earth Systems and Cosmic Evolution #Emission spectrum #Fermi Gamma-ray Space Telescope #Flux (metallurgy) #Gamma-ray bursts and supernovae #Pulsar #Spitzer Space Telescope #Telescope #astro-ph.HE
paper · pdf · doi:10.1088/0004-637x/723/1/100
published as Astrophys.J.723:100-103,2010 · Published in ApJ
openalex publication_date 2010/10/07 · arxiv created 2010/11/10 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.