Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations

H.E.S.S. Collaboration; Rob, L.; Arribas, M. Paz; Daniel, Marcus; Stawarz, Ł.; Cheesebrough, A.; Hinton, J. A.; Biteau, J.; Boisson, C.; Vincent, P.; Stinzing, F.; Horns, D.; Chadwick, P. M.; Barnacka, A.; Rowell, G.; Moulin, E.; Häffner, S.; Willmann, P.; Völk, H. J.; Trichard, C.; Khélifi, B.; White, R.; Feinstein, F.; Guillemot, L.; Reimer, A.; Benkhali, F. Ait; Degrange, B.; Perez, J.; Carrigan, S.; Spengler, G.; Dutson, K.; Zabalza, V.; Lemoine-Goumard, M.; Marx, R.; Tjus, J. Becker; Bolmont, J.; Schwemmer, S.; Angüner, E.; Cologna, G.; Domainko, W.; Conrad, J.; Edwards, T.; Lohse, T.; Schwarzburg, S.; Schwanke, U.; Marcowith, A.; Sol, H.; Farnier, C.; Meintjes, P. J.; Birsin, E.; Wagner, P.; Tavernier, T.; Marandon, V.; Giebels, B.; Dalton, M.; Bulik, T.; Balenderan, S.; Casandjian, J. M.; Espigat, P.; Davids, I. D.; Reichardt, I.; Drury, L. O'C.; Backes, M.; Spies, F.; Uchiyama, Y.; Aharonian, F.; Heinzelmann, G.; Tluczykont, M.; Giavitto, G.; Cui, Y.; Rosier-Lees, S.; Peyaud, B.; Hofmann, W.; Cohen-Tanugi, J.; Vasileiadis, G.; Deil, C.; Garrigoux, T.; Wörnlein, A.; Tavernet, J. -P.; Viana, A.; Janiak, M.; Chrétien, M.; Volpe, F.; Ward, M.; Oya, I.; Jung, I.; Gajdus, M.; Wagner, S. J.; Henri, G.; Sanchez, D. A.; Egberts, K.; Bernlöhr, K.; Förster, A.; Vuillaume, T.; van Eldik, C.; Poon, H.; Hahn, J.; Oakes, L.; Wouters, D.; Wilhelmi, E. de Oña; Rudak, B.; Romoli, C.; Valerius, K.; Katarzyński, K.; Raue, M.; Böttcher, M.; Lamanna, G.; Mayer, M.; Grudzińska, M.; Abramowski, A.; Gallant, Y. A.; Eger, P.; Krayzel, F.; Lu, C. -C.; Yang, R.; Fontaine, G.; Balzer, A.; Jacholkowska, A.; Naumann, C. L.; Brucker, J.; Lefaucheur, J.; Meyer, Manuel; Petrucci, P. -O.; de Naurois, M.; Lande, J.; Pita, S.; Stegmann, C.; Katz, U.; Pekeur, N. W.; Stycz, K.; Steenkamp, R.; Kluźniak, W.; Bordas, P.; Vorster, M.; Odaka, H.; Acero, F.; Pletsch, H.; Taylor, A. M.; Schulz, A.; Bissaldi, E.; Rieger, F.; Kastendieck, M. A.; Anton, G.; Harris, J.; Menzler, U.; van Soelen, B.; Weidinger, M.; Krakau, S.; Reyes, R. de los; Krüger, P. P.; Hervet, O.; Moderski, R.; Lopatin, A.; Akhperjanian, A. G.; Casanova, S.; Mohamed, M.; Dickinson, H. J.; Couturier, C.; Murach, T.; Santangelo, A.; Fernandez, D.; Fegan, S.; Hofverberg, P.; Fermi-LAT Collaboration; Holler, M.; Klepser, S.; Maxted, N.; Punch, M.; Niemiec, J.; Dyks, J.; Kaufmann, S.; Ostrowski, M.; Parsons, R. D.; Brun, P.; Jahn, C.; Hermann, G.; Méhault, J.; Terrier, R.; Brun, F.; Lenain, J. -P.; Fiasson, A.; Rulten, C. B.; Hillert, A.; Komin, Nu.; Wagner, R. M.; Djannati-Ataï, A.; Nolan, S. J.; Zech, A.; Jamrozy, M.; Kneiske, T.; Maurin, G.; Venter, C.; Pühlhofer, G.; Jankowsky, F.; McComb, T. J. L.; Colafrancesco, S.; Schlickeiser, R.; Fernandes, M. V.; Weitzel, Q.; Dubus, G.; Chalme-Calvet, R.; Kolitzus, D.; Füßling, M.; Kieffer, M.; Lemière, A.; Kosack, K.; Sushch, I.; Zdziarski, A. A.; Laffon, H.; Klochkov, D.; Wierzcholska, A.; Becherini, Y.; Dyrda, M.; Quirrenbach, A.; Glicenstein, J. F.; Pelletier, G.; Chaves, R. C. G.; Reimer, O.; Grondin, M. -H.; Zechlin, H. -S.; Schüssler, F.; Renaud, M.; Raab, S.; Giordano, F.; Zacharias, M.; Ohm, S.; Opitz, B.; Sahakian, V.; deWilt, P.; Panter, M.

Preprint/Report

PUBDB-2014-04510

Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations

H.E.S.S. Collaboration (Collaboration author) ; Abramowski, A.Extern* ; Aharonian, F. ; Benkhali, F. A. ; Akhperjanian, A. G. ; Angüner, E.Extern* ; Anton, G. ; Backes, M. ; Balenderan, S. ; Balzer, A.Extern* ; Barnacka, A. ; Becherini, Y. ; Tjus, J. B. ; Bernlöhr, K. ; Birsin, E.Extern* ; Bissaldi, E. ; Biteau, J. ; Böttcher, M.DESY* ; Boisson, C.Extern* ; Bolmont, J.DESY* ; Bordas, P. ; Brucker, J. ; Brun, F. ; Brun, P. ; Bulik, T. ; Carrigan, S. ; Casanova, S. ; Chadwick, P. M. ; Chalme-Calvet, R. ; Chaves, R. C. G. ; Cheesebrough, A. ; Chrétien, M. ; Colafrancesco, S. ; Cologna, G. ; Conrad, J. ; Couturier, C. ; Cui, Y. ; Dalton, M. ; Daniel, M.Extern* ; Davids, I. D. ; Degrange, B. ; Deil, C. ; deWilt, P. ; Dickinson, H. J. ; Djannati-Ataï, A. ; Domainko, W. ; Drury, L. O. ; Dubus, G. ; Dutson, K. ; Dyks, J. ; Dyrda, M. ; Edwards, T.Extern* ; Egberts, K.Extern* ; Eger, P. ; Espigat, P. ; Farnier, C. ; Fegan, S. ; Feinstein, F. ; Fernandes, M. V.Extern* ; Fernandez, D. ; Fiasson, A. ; Fontaine, G. ; Förster, A.DESY* ; Füßling, M.Extern* ; Gajdus, M.Extern* ; Gallant, Y. A. ; Garrigoux, T. ; Giavitto, G.DESY* ; Giebels, B. ; Glicenstein, J. F. ; Grondin, M. -. ; Grudzińska, M. ; Häffner, S. ; Hahn, J.Extern* ; Harris, J. ; Heinzelmann, G.Extern* ; Henri, G. ; Hermann, G. ; Hervet, O. ; Hillert, A. ; Hinton, J. A. ; Hofmann, W. ; Hofverberg, P. ; Holler, M.Extern* ; Horns, D.Extern* ; Jacholkowska, A. ; Jahn, C.Extern* ; Jamrozy, M. ; Janiak, M. ; Jankowsky, F. ; Jung, I. ; Kastendieck, M. A. ; Katarzyński, K. ; Katz, U. ; Kaufmann, S. ; Khélifi, B. ; Kieffer, M. ; Klepser, S.DESY* ; Klochkov, D. ; Kluźniak, W. ; Kneiske, T.Extern* ; Kolitzus, D. ; Komin, N. ; Kosack, K. ; Krakau, S. ; Krayzel, F. ; Krüger, P. P. ; Laffon, H. ; Lamanna, G. ; Lefaucheur, J. ; Lemière, A. ; Lemoine-Goumard, M. ; Lenain, J. -. ; Lohse, T.Extern* ; Lopatin, A.DESY* ; Lu, C. -. ; Marandon, V. ; Marcowith, A. ; Marx, R. ; Maurin, G. ; Maxted, N. ; Mayer, M.DESY* ; McComb, T. J. L. ; Méhault, J. ; Meintjes, P. J. ; Menzler, U. ; Meyer, M.Extern* ; Moderski, R. ; Mohamed, M. ; Moulin, E. ; Murach, T.DESY* ; Naumann, C. L. ; de Naurois, M. ; Niemiec, J.Extern* ; Nolan, S. J. ; Oakes, L.Extern* ; Odaka, H. ; Ohm, S.DESY* ; Wilhelmi, E. d. O. ; Opitz, B.Extern* ; Ostrowski, M. ; Oya, I. ; Panter, M. ; Parsons, R. D. ; Arribas, M. P. ; Pekeur, N. W. ; Pelletier, G. ; Perez, J. ; Petrucci, P. -. ; Peyaud, B. ; Pita, S. ; Poon, H. ; Pühlhofer, G. ; Punch, M. ; Quirrenbach, A. ; Raab, S. ; Raue, M.Extern* ; Reichardt, I. ; Reimer, A. ; Reimer, O. ; Renaud, M. ; Reyes, R. d. l. ; Rieger, F. ; Rob, L. ; Romoli, C. ; Rosier-Lees, S. ; Rowell, G. ; Rudak, B. ; Rulten, C. B. ; Sahakian, V. ; Sanchez, D. A. ; Santangelo, A. ; Schlickeiser, R. ; Schüssler, F. ; Schulz, A.DESY* ; Schwanke, U.Extern* ; Schwarzburg, S. ; Schwemmer, S. ; Sol, H. ; Spengler, G.Extern* ; Spies, F. ; Stawarz, Ł. ; Steenkamp, R. ; Stegmann, C.DESY* ; Stinzing, F.Extern* ; Stycz, K.DESY* ; Sushch, I. ; Tavernet, J. -. ; Tavernier, T. ; Taylor, A. M. ; Terrier, R. ; Tluczykont, M. ; Trichard, C. ; Valerius, K. ; van Eldik, C. ; van Soelen, B. ; Vasileiadis, G. ; Venter, C. ; Viana, A. ; Vincent, P. ; Völk, H. J. ; Volpe, F. ; Vorster, M. ; Vuillaume, T. ; Wagner, S. J. ; Wagner, P. ; Wagner, R. M. ; Ward, M. ; Weidinger, M. ; Weitzel, Q. ; White, R. ; Wierzcholska, A. ; Willmann, P. ; Wörnlein, A. ; Wouters, D. ; Yang, R. ; Zabalza, V. ; Zacharias, M. ; Zdziarski, A. A. ; Zech, A. ; Zechlin, H. -. ; Fermi-LAT Collaboration (Collaboration author) ; Acero, F. ; Casandjian, J. M. ; Cohen-Tanugi, J. ; Giordano, F.DESY* ; Guillemot, L. ; Lande, J. ; Pletsch, H. ; Uchiyama, Y.

2014

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Report No.: arXiv:1407.0862

Abstract: Previous observations with HESS have revealed the existence of an extended very-high-energy (VHE; E>100 GeV) gamma-ray source, HESS J1834-087, coincident with the SNR W41. The origin of the gamma-ray emission has been further investigated with HESS and the Fermi-LAT. The gamma-ray data provided by 61h (HESS) and 4 yrs (Fermi LAT) of observations cover over 5 decades in energy (1.8GeV - 30TeV). The morphology and spectrum of the TeV and GeV sources have been studied and multi-wavelength data have been used to investigate the origin of the observed emission. The TeV source can be modeled with a sum of two components: one point-like and one significantly extended (sig_TeV = 0.17{\deg}), both centered on SNR W41 and exhibiting spectra described by a power law of index 2.6. The GeV source detected with Fermi is extended (sig_GeV =0.15{\deg}) and morphologically matches the VHE emission. Its spectrum can be described by a power-law with index 2.15 and joins smoothly the one of the whole TeV source. A break appears in the spectra around 100 GeV. Two main scenarios are proposed to explain the emission: a pulsar wind nebula (PWN) or the interaction of SNR W41 with a molecular cloud. X-ray observations suggest the presence of a point-like source (pulsar candidate) near the center of the SNR and non-thermal X-ray diffuse emission which could arise from a potential PWN. The PWN scenario is supported by the match of of the TeV and GeV positions with the putative pulsar. However, the overall spectrum is reproduced by a 1-zone leptonic model only if an excess of low-energy electrons is injected by a high spin-down power pulsar. This low-energy component is not needed if the point-like TeV source is unrelated to the extended GeV and TeV sources. The interacting SNR scenario is supported by the spatial coincidence between the gamma-ray sources, the detection of OH maser lines and the hadronic modeling.

Note: OA

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