Discovery of a Compact X-ray Source in the LMC Supernova Remnant N23 with Chandra.pdfVIP

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Discovery of a Compact X-ray Source in the LMC Supernova Remnant N23 with Chandra.pdf

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Discovery of a Compact X-ray Source in the LMC Supernova Remnant N23 with Chandra

a r X i v : a s t r o - p h / 0 6 0 8 1 9 1 v 1 9 A u g 2 0 0 6 Discovery of a Compact X-ray Source in the LMC Supernova Remnant N23 with Chandra Asami Hayato1,2, Aya Bamba2, Toru Tamagawa2,1, and Kiyoshi Kawabata1 ABSTRACT An X-ray compact source was discovered with Chandra in a supernova rem- nant (SNR) N23, located in the Large Magellanic Cloud. The compact source (CXOU J050552.3?680141) is seen in only the hard band ( 2 keV) image of N23, while the soft band image ( 2 keV) shows diffuse emission of the SNR, with an extent of ～ 60′′ × 80′′. The compact source is located at almost the center of N23, and there is no identifiable object for the source from previous ob- servations at any other wavelength. The source spectrum is best explained by a power-law model with a photon index of Γ = 2.2 +0.5 ?0.3 and an absorption-corrected luminosity of Lx = 1.0 × 10 34 ergs s?1 in the 0.5–10 keV band for a distance of 50 kpc. Neither pulsation nor time variability of the source was detected with this observation with a time resolution of 3.2 sec. These results correspond with those of Hughes et al. (2006), who carried out analysis independently around the same time as our work. Based on information from the best-fit power-law model, we suggest that the source emission is most likely from a rotation-powered pulsar and/or a pulsar wind nebula. It is generally inferred that the progenitor of N23 is a core-collapsed massive star. Subject headings: ISM: supernova remnants — X-rays: individual (N23, CXOU J050552.3?680141) 1. Introduction The Large Magellanic Cloud (LMC) quite well meet the requirements of a systematic study of supernova remnants (SNRs), in view of the facts concerning the known distance 1Department of Physics, Faculty of Science, Tokyo University of Science, 1-3, Kagurazaka, Shinjyuku-ku, Tokyo 162-8601, Japan; hayato@crab.riken.jp 2RIKEN (Institute of Physical and Chemical Research), 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan – 2 – (50 kpc; Feast 1999) an