The X-ray properties of the energetic pulsar PSR J1838-0655

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27891

Title:	The X-ray properties of the energetic pulsar PSR J1838-0655
Authors:	Lin,LCC;Takata,J;Hwang,CY;Liang,JS
Contributors:	天文研究所
Keywords:	GALACTIC PLANE SURVEY;GAMMA-RAYS;INNER GALAXY;CRAB PULSAR;GAP MODEL;EMISSION;HESS;KOOKABURRA;DISCOVERY;CATALOG
Date:	2009
Issue Date:	2010-06-29 19:35:33 (UTC+8)
Publisher:	中央大學
Abstract:	We present and interpret several new X-ray features of the X-ray pulsar PSR J1838-0655. The X-ray data are obtained from the archival data of Chandra, RXTE and Suzaku. We combine all these X-ray data and fit the spectra with different models. We find that the joint spectra are difficult to fit with a single power law; a broken power-law model with a break at around 6.5 keV can improve the fit significantly. The photon index changes from Gamma = 1.0 (below 6.5 keV) to 1.5 (above 6.5 keV); this indicates a softer spectral behaviour at hard X-rays. The X-ray flux at 2-20 keV is found to be 1.6 x 10-11 erg cm-2 s-1. The conversion efficiency from the spin-down luminosity is similar to 0.9 per cent at 0.8-10 keV, which is much higher than that (similar to 10-3 to 10-4 per cent) of the pulsars that show similar timing properties. We discuss non-thermal radiation mechanisms for the observed high X-ray conversion efficiency and find that emission from the magnetosphere of a greatly inclined rotator is the most favourable interpretation for the conversion rate and the pulse profiles at X-ray bands. A line feature close to 6.65 keV is also detected in the spectra of Suzaku/X-ray imaging spectrometer; it might be the K alpha emission of highly ionized Fe surrounding the pulsar.
Relation:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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