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Chandra and HESS observations of the supernova remnant CTB 37B

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posted on 2012-10-24, 09:09 authored by F. Aharonian, W. Benbow, K. Bernlöhr, I. Braun, R. Bühler, S. Carrigan, R. C. G. Chaves, A. C. Clapson, L. Costamante, W. Domainko, K. Egberts, K. Katarzyński, F. Volpe, D. Khangulyan, O. Reimer, P. Goret, S. Funk, M. Beilicke, M. Lernoine-Goumard, K. Kosack, D. Spangler, D. Nekrassov, S. Ohm, M. Panter, M. Raue, M. Renaud, F. Rieger, Van Eldik C, E. Moulin, R. Cornils, H. J. Volk, M. Ward, A. G. Akhperjanian, V. Sahakian, G. Heinzelmann, D. Horns, M. Vivier, J. Ripken, S. Rosier-Lees, M. Dalton, M. Füßling, I. Büsching, M. Kerschhaggl, T. Lohse, U. Schwanke, C. Boisson, J. -. P. Lenain, J. M. Martin, De Barres Almeida U, H. Sol, J. P. Valle, A. Zech, M. Holleran, E. Brion, P. M. Chadwick, H. J. Dickinson, C. Hadjichristidis, D. Keogh, I. J. Latham, S. Schwemmer, T. J. L. McComb, S. J. Nolan, A. Djannati-Ataï, De Jager OC, K. J. Orford, J. L. Osborne, S. M. Rayner, P. H. Tam, B. C. Raubenheimer, P. Espigat, C. Venter, L. -. M. Chounet, C. Stegmann, B. Degrange, G. Fontaine, B. Giebels, B. Khélifi, M. Naumann-Godo, G. Superina, S. J. Wagner, De Oña Wilhelmi E, G. Coignet, T. Boutelier, F. Dubois, G. Lamanna, S. Pita, M. Punch, C. Farnier, R. Terrier, R. Schlickeiser, O'C Drury L, S. Gabici, G. Dubus, C. Masterson, B. Behera, D. Emmanoulopoulos, D. Hauser, M. Hauser, S. Kaufmann, F. Feinstein, G. Pedaletti, R. Schröder, G. Pühlhofer, G. Henri, A. Quirrenbach, A. Fiasson, Y. A. Gallant, A. Jacholkowska, N. Komin, A. Marcowith, A. Förster, G. Vasileiadis, J. Brucker, A. Shalchi, G. Pelletier, B. Glück, I. Jung, F. M. Schock, G. Hermann, P. -. O. Petrucci, R. Steenkamp, A. Hoffmann, E. Kendziorra, A. R. Bazer-Bachi, A. Santangelo, S. Schwarzburg, O. Martineau-Huynh, D. Maurin, De Naurois M, J. -. P. Tavernet, P. Vincent, W. Hofmann, M. Ostrowski, D. Nedbal, V. Borrel, L. Rob, J. Ruppel, Ł. Stawarz, T. Bulik, S. Hoppe, J. Dyks, R. Moderski, J. F. Glicenstein, B. Rudak, A. A. Zdziarski, J. -. P. Olive, J. A. Hinton, J. L. Skilton, G. Rowell
We discovered the >100 GeV $\gamma$-ray source, HESS J1713-381, apparently associated with the shell-type supernova remnant (SNR) CTB 37B, using HESS in 2006. In 2007 we performed X-ray follow-up observations with Chandra with the aim of identifying a synchrotron counterpart to the TeV source and/or thermal emission from the SNR shell. These new Chandra data, together with additional TeV data, allow us to investigate the nature of this object in much greater detail than was previously possible. The new X-ray data reveal thermal emission from a ~4' region in close proximity to the radio shell of CTB 37B. The temperature of this emission implies an age for the remnant of ~5000 years and an ambient gas density of ~0.5 cm-3. Both these estimates are considerably uncertain due to the asymmetry of the SNR and possible modifications of the kinematics due to efficient cosmic ray (CR) acceleration. A bright ($\approx$ 7 $\times$ 10-13 erg cm-2 s-1) and unresolved (<1$\arcsec$) source (CXOU J171405.7-381031), with a soft ($\Gamma$$\approx$3.3) non-thermal spectrum is also detected in coincidence with the radio shell. Absorption indicates a column density consistent with the thermal emission from the shell, suggesting a genuine association rather than a chance alignment. The observed TeV morphology is consistent with an origin in the complete shell of CTB 37B. The lack of diffuse non-thermal X-ray emission suggests an origin of the $\gamma$-ray emission via the decay of neutral pions produced in interactions of protons and nuclei, rather than inverse Compton (IC) emission from relativistic electrons.

History

Citation

Astronomy & Astrophysics, 2008, 486 (3), pp. 829-836

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  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

eissn

1432-0746

Copyright date

2008

Available date

2012-10-24

Publisher version

http://www.aanda.org/articles/aa/abs/2008/30/aa09655-08/aa09655-08.html

Language

en

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