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An X-ray study of the SNR G344.7-0.1 and the central object CXOU J170357.8-414302



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Combi, J. A. and Albacete Colombo, J. F. and López Santiago, J. and Romero, G. E. and Sánchez Ayaso, E. and Martí, J. and Luque Escamilla, P. L. and Pérez González, Pablo Guillermo and Muñoz Arjonilla,, A. J. and Sánchez Sutil, J. R. (2010) An X-ray study of the SNR G344.7-0.1 and the central object CXOU J170357.8-414302. Astronomy & Astrophysics, 522 . ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/200913735


Aims. We report results of an X-ray study of the supernova remnant (SNR) G344.7-0.1 and the point-like X-ray source located at the geometrical center of the SNR radio structure. Methods. The morphology and spectral properties of the remnant and the central X-ray point-like source were studied using data from the XMM-Newton and Chandra satellites. Archival radio data and infrared Spitzer observations at 8 and 24 mu m were used to compare and study its multi-band properties at different wavelengths. Results. The XMM-Newton and Chandra observations reveal that the overall X-ray emission of G344.7-0.1 is extended and correlates very well with regions of bright radio and infrared emission. The X-ray spectrum is dominated by prominent atomic emission lines. These characteristics suggest that the X-ray emission originated in a thin thermal plasma, whose radiation is represented well by a plane-parallel shock plasma model (PSHOCK). Our study favors the scenario in which G344.7-0.1 is a 6 x 10^3 year old SNR expanding in a medium with a high density gradient and is most likely encountering a molecular cloud on the western side. In addition, we report the discovery of a soft point-like X-ray source located at the geometrical center of the radio SNR structure. The object presents some characteristics of the so-called compact central objects (CCO). However, its neutral hydrogen absorption column (N_H) is inconsistent with that of the SNR. Coincident with the position of the source, we found infrared and optical objects with typical early-K star characteristics. The X-ray source may be a foreground star or the CCO associated with the SNR. If this latter possibility were confirmed, the point-like source would be the farthest CCO detected so far and the eighth member of the new population of isolated and weakly magnetized neutron stars.

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© ESO, 2010.
We are grateful to the referee for his valuable suggestions and comments which helped us to improve the paper. The authors acknowledge support by DGI of the Spanish Ministerio de Educación y Ciencia under grants AYA2007-68034-C03-02/-01, FEDER funds, Plan Andaluz de Investigación Desarrollo e Innovación (PAIDI) of Junta de Andalucía as research group FQM-322 and the excellence fund FQM-5418. J.A.C., J.F.A.C. and G.E.R are researchers of CONICET. J.F.A.C was supported by grant PICT 2007-02177 (SecyT). G. E. R. and J.A.C were supported by grant PICT 0700848 BID 1728/OC-AR (ANPCyT) and PIP 2010-0078 (CONICET). J.L.S. acknowledges support by the Spanish Ministerio de Innovación y Tecnología under grant AYA2008-06423-C03-03. P. G. P.-G. acknowledges support from the Ramón y Cajal Program, financed by the Spanish Government and/or the European Union. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Uncontrolled Keywords:Galactic plane survey; Multiband imaging photometer; Counting detector images; Large-magellanic-cloud; Supernova-remnants; Wavelet transforms; Infrared-emission; Dust destruction; Cassiopeia-a; Spitzer mips
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:38535
Deposited On:21 Jul 2016 15:11
Last Modified:10 Dec 2018 15:05

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