HESS J1818-154, a new composite supernova remnant discovered in TeV gamma rays and X-rays

A. Abramowski F. Aharonian F. Ait Benkhali A. G. Akhperjanian E. Angüner G. Anton S. Balenderan A. Balzer A. Barnacka Y. Becherini 1 J. Becker Tjus K. Bernlöhr E. Birsin E. Bissaldi J. Biteau M. Böttcher C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun P. Brun 2 T. Bulik S. Carrigan S. Casanova M. Cerruti P. M. Chadwick R. Chalme-Calvet R. C. G. Chaves 2 A. Cheesebrough M. Chrétien S. Colafrancesco G. Cologna J. Conrad C. Couturier 3 Y. Cui M. Dalton M. K. Daniel I. D. Davids B. Degrange 4 C. Deil P. De Wilt H. J. Dickinson A. Djannati-Ataï 5 W. Domainko L. O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda T. Edwards K. Egberts P. Eger P. Espigat 1 C. Farnier S. Fegan F. Feinstein M. V. Fernandes D. Fernandez A. Fiasson 6 G. Fontaine A. Förster M. Füßling M. Gajdus Y. A. Gallant 7 T. Garrigoux 3 G. Giavitto B. Giebels J. F. Glicenstein 2 M. -H. Grondin M. Grudzińska S. Häffner J. Hahn J. Harris G. Heinzelmann G. Henri G. Hermann O. Hervet A. Hillert J. A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska C. Jahn M. Jamrozy M. Janiak F. Jankowsky I. Jung M. A. Kastendieck K. Katarzynski U. Katz S. Kaufmann B. Khélifi 1 M. Kieffer S. Klepser D. Klochkov W. Kluźniak T. Kneiske D. Kolitzus Nu. Komin 6 K. Kosack 2 S. Krakau F. Krayzel 6 P. P. Krüger H. Laffon 4 G. Lamanna 6 J. Lefaucheur 1 A. Lemière 1 M. Lemoine-Goumard 8 J. -P. Lenain D. Lennarz T. Lohse A. Lopatin C. -C. Lu V. Marandon A. Marcowith R. Marx G. Maurin 6 N. Maxted M. Mayer T. J. L. Mccomb J. Méhault 7 P. J. Meintjes U. Menzler M. Meyer R. Moderski M. Mohamed E. Moulin 2 T. Murach C. L. Naumann 3 M. De Naurois J. Niemiec S. J. Nolan L. Oakes S. Ohm E. de Ona Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter R. D. Parsons M. Paz Arribas N. W. Pekeur G. Pelletier J. Perez P. -O. Petrucci B. Peyaud 2 S. Pita 1 H. Poon G. Pühlhofer M. Punch 1 A. Quirrenbach S. Raab M. Raue A. Reimer O. Reimer M. Renaud R. de Los Reyes F. Rieger L. Rob C. Romoli S. Rosier-Lees 6 G. Rowell B. Rudak C. B. Rulten V. Sahakian D. A. Sanchez A. Santangelo R. Schlickeiser F. Schüssler 2 A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol G. Spengler F. Spies L. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J. -P. Tavernet 3 T. Tavernier 1 A. M. Taylor R. Terrier 1 M. Tluczykont C. Trichard 6 K. Valerius C. Van Eldik B. Van Soelen G. Vasileiadis C. Venter A. Viana P. Vincent H. J. Völk F. Volpe M. Vorster T. Vuillaume S. J. Wagner P. Wagner M. Ward M. Weidinger Q. Weitzel R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters 2 V. Zabalza M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech H. -S. Zechlin
Abstract : Composite supernova remnants (SNRs) constitute a small subclass of remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-like shock front and from a pulsar wind nebula (PWN) located inside of the SNR. These systems represent a unique evolutionary phase of SNRs where observations in the radio, X-ray and gamma-ray regimes allow the study of the co-evolution of both of these energetic phenomena. In this article, we report results from observations of the shell-type SNR G15.4+0.1 performed with the High Energy Stereoscopic System (H.E.S.S.) and XMM-Newton. A compact TeV gamma-ray source, HESSJ1818-154, located in the center and contained within the shell of G15.4+0.1 is detected by H.E.S.S. featuring a spectrum best represented by a power-law model with a spectral index of $-2.3 \pm 0.3_{stat} \pm 0.2_{sys}$ and an integral flux of F$(>0.42\,\mathrm{TeV}$)=($0.9 \pm 0.3_{\mathrm{stat}} \pm 0.2_{\mathrm{sys}}) \times 10^{-12}$ cm$^{-2}$ s$^{-1}$. Furthermore, a recent observation with XMM-Newton reveals extended X-ray emission strongly peaked in the center of G15.4+0.1. The X-ray source shows indications for an energy-dependent morphology featuring a compact core at energies above 4 keV and more extended emission that fills the entire region within the SNR at lower energies. Together, the X-ray and VHE gamma-ray emission provide strong evidence for the existence of a PWN located inside the shell of G15.4+0.1 and this SNR can therefore be classified as a composite based on these observations. The radio, X-ray and gamma-ray emission from the PWN is compatible with a one-zone leptonic model which requires a low average magnetic field inside the emission region. An unambiguous counterpart to the putative pulsar, thought to power the PWN, has not been detected neither in radio nor in X-ray observations of G15.4+0.1.
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A. Abramowski, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, E. Angüner, et al.. HESS J1818-154, a new composite supernova remnant discovered in TeV gamma rays and X-rays. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 562, pp.A40. 〈10.1051/0004-6361/201322914〉. 〈in2p3-00907620〉

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