Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S.

Abdalla, H.; Lau, J.; Rulten, C. B.; Spanier, F.; Stawarz, Ł.; O’Brien, P.; Hinton, J. A.; Boisson, C.; Vincent, P.; Horns, D.; Seglar-Arroyo, M.; Wagner, P.; Rowell, G.; Moulin, E.; Willmann, P.; Trichard, C.; Khélifi, B.; López-Coto, R.; Arakawa, M.; Gottschall, D.; Rieger, F.; Hawkes, J.; Reimer, A.; Benkhali, F. Ait; Degrange, B.; Viana, A.; Shafi, N.; Chakraborty, N.; Seyffert, A. S.; Devin, J.; Yang, R.; Dutson, K.; Simoni, R.; Bernhard, S.; Marx, R.; Tjus, J. Becker; Bolmont, J.; Niederwanger, F.; Berge, D.; Cologna, G.; Domainko, W.; Conrad, J.; Edwards, T.; Lohse, T.; Blackwell, R.; W. Mitchell, A. M.; Schwanke, U.; Grondin, M.-H.; Sol, H.; Farnier, C.; Meintjes, P. J.; Rauth, R.; Stegmann, C.; Bonnefoy, S.; Marandon, V.; Giebels, B.; Sanchez, D. A.; Bulik, T.; Böttcher, M.; Zefi, F.; Takahashi, T.; Venter, C.; Davids, I. D.; Bryan, M.; Jogler, T.; Backes, M.; Spies, F.; Uchiyama, Y.; Aharonian, F.; Heinzelmann, G.; Tluczykont, M.; Punch, M.; Giavitto, G.; Cui, Y.; Peyaud, B.; Spengler, G.; Hofmann, W.; Prokhorov, D.; Vasileiadis, G.; Deil, C.; Garrigoux, T.; Wörnlein, A.; Eldik, C. van; Tavernier, T.; Janiak, M.; Lemoine-Goumard, M.; Klochkov, D.; Zech, A.; Morå, K.; Prokoph, H.; Angüner, E. O.; Haupt, M.; Santangelo, A.; Wagner, S. J.; Henri, G.; Aubert, P.; Egberts, K.; Ziegler, A.; Bernlöhr, K.; Förster, A.; Bregeon, J.; Vuillaume, T.; Poon, H.; Padovani, M.; Hahn, J.; Wouters, D.; Zanin, R.; Rudak, B.; Romoli, C.; Katarzyński, K.; Saito, S.; Katz, U.; Jankowsky, D.; Meyer, M.; Mayer, M.; Nakashima, S.; Tsuji, N.; Büchele, M.; Gallant, Y. A.; Eger, P.; Eschbach, S.; Reimer, O.; Holch, T. L.; Quirrenbach, A.; los Reyes, R. de; Fontaine, G.; Balzer, A.; Jacholkowska, A.; Lefaucheur, J.; Jingo, M.; Leser, E.; Kraus, M.; Veh, J.; H. E. S. S. Collaboration; Völk, H. J.; Funk, S.; Pita, S.; Pekeur, N. W.; Petrucci, P.-O.; Salek, D.; Lamanna, G.; Voisin, F.; Stycz, K.; Arrieta, M.; Steenkamp, R.; Kluźniak, W.; Bordas, P.; Odaka, H.; Tavernet, J.-P.; Tiziani, D.; Zaborov, D.; Taylor, A. M.; Lemière, A.; Krakau, S.; Naurois, M. de; Drury, L. O’C.; Krüger, P. P.; Hermann, G.; Moderski, R.; Akhperjanian, A. G.; Khangulyan, D.; Jung-Richardt, I.; Lefranc, V.; Decock, J.; Chen, A.; Mariaud, C.; Schlickeiser, R.; Casanova, S.; Terrier, R.; Mohamed, M.; Murach, T.; Fegan, S.; Tibaldo, L.; Liu, R.; Holler, M.; Klepser, S.; Maxted, N.; Marcowith, A.; Niemiec, J.; Dyks, J.; Ostrowski, M.; Lees, J.-P.; Parsons, R. D.; Brun, P.; Abramowski, A.; Sasaki, M.; Barnard, M.; Brun, F.; Shilon, I.; Fiasson, A.; Komin, Nu.; Zacharias, M.; Wagner, R. M.; Djannati-Ataï, A.; Iwasaki, H.; Chevalier, J.; Dirson, L.; van der Walt, D. J.; Jamrozy, M.; Maurin, G.; Katsuragawa, M.; Jouvin, L.; Goyal, A.; Pühlhofer, G.; Jankowsky, F.; Piel, Q.; Colafrancesco, S.; Mohrmann, L.; Richter, S.; Schwemmer, S.; Kerszberg, D.; Fernandes, M. V.; Tuffs, R.; Schulz, Anneli; Andersson, T.; Lorentz, M.; Donath, A.; G. Chaves, R. C.; Kolitzus, D.; Ernenwein, J.-P.; Füßling, M.; Lenain, J.-P.; Kosack, K.; Perennes, C.; Sushch, I.; Zdziarski, A. A.; Capasso, M.; Laffon, H.; Oya, I.; Wierzcholska, A.; Becherini, Y.; Oakes, L.; Vink, J.; Settimo, M.; Gabici, S.; Glicenstein, J. F.; Pelletier, G.; King, J.; Kastendieck, M. A.; Cerruti, M.; Carr, J.; White, R.; Schüssler, F.; Wadiasingh, Z.; Soelen, B. van; Renaud, M.; Raab, S.; Żywucka, N.; Rensburg, C. van; Ohm, S.; Coffaro, M.; Ivascenko, A.; Sahakian, V.; deWilt, P.; Lypova, I.; Condon, B.; Hoischen, C.; Panter, M.

doi:10.1051/0004-6361/201730824

Journal Article

PUBDB-2018-02322

Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S.

Abdalla, H. ; Abramowski, A. ; Aharonian, F. ; Benkhali, F. A. ; Akhperjanian, A. G. ; Andersson, T. ; Angüner, E. O. ; Arakawa, M. ; Arrieta, M. ; Aubert, P. ; Backes, M. ; Balzer, A. ; Barnard, M. ; Becherini, Y. ; Tjus, J. B. ; Berge, D.DESY* ; Bernhard, S. ; Bernlöhr, K. ; Blackwell, R. ; Böttcher, M. ; Boisson, C. ; Bolmont, J. ; Bonnefoy, S.DESY* ; Bordas, P. ; Bregeon, J. ; Brun, F. ; Brun, P. ; Bryan, M. ; Büchele, M. ; Bulik, T. ; Capasso, M. ; Carr, J. ; Casanova, S. ; Cerruti, M. ; Chakraborty, N. ; G. Chaves, R. C. ; Chen, A. ; Chevalier, J. ; Coffaro, M. ; Colafrancesco, S. ; Cologna, G. ; Condon, B. ; Conrad, J. ; Cui, Y. ; Davids, I. D. ; Decock, J. ; Degrange, B. ; Deil, C. ; Devin, J. ; deWilt, P. ; Dirson, L. ; Djannati-Ataï, A. ; Domainko, W. ; Donath, A. ; Drury, L. O. ; Dutson, K. ; Dyks, J. ; Edwards, T. ; Egberts, K. ; Eger, P. ; Ernenwein, J.-P. ; Eschbach, S. ; Farnier, C. ; Fegan, S. ; Fernandes, M. V. ; Fiasson, A. ; Fontaine, G. ; Förster, A. ; Funk, S. ; Füßling, M.DESY* ; Gabici, S. ; Gallant, Y. A. ; Garrigoux, T. ; Giavitto, G.DESY* ; Giebels, B. ; Glicenstein, J. F. ; Gottschall, D. ; Goyal, A. ; Grondin, M.-H. ; Hahn, J. ; Haupt, M.DESY* ; Hawkes, J. ; Heinzelmann, G. ; Henri, G. ; Hermann, G. ; Hinton, J. A. ; Hofmann, W. ; Hoischen, C. ; Holch, T. L. ; Holler, M. ; Horns, D. ; Ivascenko, A. ; Iwasaki, H. ; Jacholkowska, A. ; Jamrozy, M. ; Janiak, M. ; Jankowsky, D. ; Jankowsky, F. ; Jingo, M. ; Jogler, T. ; Jouvin, L. ; Jung-Richardt, I. ; Kastendieck, M. A. ; Katarzyński, K. ; Katsuragawa, M. ; Katz, U. ; Kerszberg, D. ; Khangulyan, D. ; Khélifi, B. ; King, J. ; Klepser, S.DESY* ; Klochkov, D. ; Kluźniak, W. ; Kolitzus, D. ; Komin, N. ; Kosack, K. ; Krakau, S. ; Kraus, M. ; Krüger, P. P. ; Laffon, H. ; Lamanna, G. ; Lau, J. ; Lees, J.-P. ; Lefaucheur, J. ; Lefranc, V. ; Lemière, A. ; Lemoine-Goumard, M. ; Lenain, J.-P. ; Leser, E. ; Lohse, T. ; Lorentz, M. ; Liu, R. ; López-Coto, R. ; Lypova, I.DESY* ; Marandon, V. ; Marcowith, A. ; Mariaud, C. ; Marx, R. ; Maurin, G. ; Maxted, N. ; Mayer, M. ; Meintjes, P. J. ; Meyer, M. ; W. Mitchell, A. M. ; Moderski, R. ; Mohamed, M. ; Mohrmann, L. ; Morå, K. ; Moulin, E. ; Murach, T.DESY* ; Nakashima, S. ; Naurois, M. d. ; Niederwanger, F. ; Niemiec, J. ; Oakes, L. ; O’Brien, P. ; Odaka, H. ; Ohm, S. ; Ostrowski, M. ; Oya, I. ; Padovani, M. ; Panter, M. ; Parsons, R. D. ; Pekeur, N. W. ; Pelletier, G. ; Perennes, C. ; Petrucci, P.-O. ; Peyaud, B. ; Piel, Q. ; Pita, S. ; Poon, H. ; Prokhorov, D. ; Prokoph, H. ; Pühlhofer, G. ; Punch, M. ; Quirrenbach, A. ; Raab, S. ; Rauth, R. ; Reimer, A. ; Reimer, O. ; Renaud, M. ; los Reyes, R. d. ; Richter, S. ; Rieger, F. ; Romoli, C. ; Rowell, G. ; Rudak, B. ; Rulten, C. B. ; Sahakian, V. ; Saito, S. ; Salek, D. ; Sanchez, D. A. ; Santangelo, A. ; Sasaki, M. ; Schlickeiser, R. ; Schüssler, F. ; Schulz, A.DESY* ; Schwanke, U. ; Schwemmer, S. ; Seglar-Arroyo, M. ; Settimo, M. ; Seyffert, A. S. ; Shafi, N. ; Shilon, I. ; Simoni, R. ; Sol, H. ; Spanier, F. ; Spengler, G. ; Spies, F. ; Stawarz, Ł. ; Steenkamp, R. ; Stegmann, C.DESY* ; Stycz, K. ; Sushch, I.DESY* ; Takahashi, T. ; Tavernet, J.-P. ; Tavernier, T. ; Taylor, A. M. ; Terrier, R. ; Tibaldo, L. ; Tiziani, D. ; Tluczykont, M. ; Trichard, C. ; Tsuji, N. ; Tuffs, R. ; Uchiyama, Y. ; van der Walt, D. J. ; Eldik, C. v. ; Rensburg, C. v. ; Soelen, B. v. ; Vasileiadis, G. ; Veh, J. ; Venter, C. ; Viana, A. ; Vincent, P. ; Vink, J. ; Voisin, F. ; Völk, H. J. ; Vuillaume, T. ; Wadiasingh, Z. ; Wagner, S. J. ; Wagner, P. ; Wagner, R. M. ; White, R. ; Wierzcholska, A. ; Willmann, P. ; Wörnlein, A. ; Wouters, D. ; Yang, R. ; Zaborov, D. ; Zacharias, M. ; Zanin, R. ; Zdziarski, A. A. ; Zech, A. ; Zefi, F. ; Ziegler, A. ; Żywucka, N. ; H. E. S. S. Collaboration (Collaboration author)DESY*

2018
EDP Sciences Les Ulis

Astronomy and astrophysics 612, A9 (2018) [10.1051/0004-6361/201730824]

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Please use a persistent id in citations: doi:10.1051/0004-6361/201730824 doi:10.3204/PUBDB-2018-02322

Abstract: The diffuse very high-energy (VHE; >100 GeV) γ-ray emission observed in the central 200 pc of the Milky Way by H.E.S.S. was found to follow dense matter distribution in the central molecular zone (CMZ) up to a longitudinal distance of about 130 pc to the Galactic centre (GC), where the flux rapidly decreases. This was initially interpreted as the result of a burst-like injection of energetic particles 10$^4$ yr ago, but a recent more sensitive H.E.S.S. analysis revealed that the cosmic-ray (CR) density profile drops with the distance to the centre, making data compatible with a steady cosmic PeVatron at the GC. In this paper, we extend this analysis to obtain, for the first time, a detailed characterisation of the correlation with matter and to search for additional features and individual γ-ray sources in the inner 200 pc. Taking advantage of 250 h of H.E.S.S. data and improved analysis techniques, we perform a detailed morphology study of the diffuse VHE emission observed from the GC ridge and reconstruct its total spectrum. To test the various contributions to the total γ-ray emission, we used an iterative 2D maximum-likelihood approach that allows us to build a phenomenological model of the emission by summing a number of different spatial components. We show that the emission correlated with dense matter covers the full CMZ and that its flux is about half the total diffuse emission flux. We also detect some emission at higher latitude that is likely produced by hadronic collisions of CRs in less dense regions of the GC interstellar medium. We detect an additional emission component centred on the GC and extending over about 15 pc that is consistent with the existence of a strong CR density gradient and confirms the presence of a CR accelerator at the very centre of our Galaxy. We show that the spectrum of full ridge diffuse emission is compatible with that previously derived from the central regions, suggesting that a single population of particles fills the entire CMZ. Finally, we report the discovery of a VHE γ-ray source near the GC radio arc and argue that it is produced by the pulsar wind nebula candidate G0.13−0.11.

Classification:

ddc:520

Note: (c) ESO

Contributing Institute(s):

High Energy Steroscopic System (ZEU-HESS)

Research Program(s):

613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)

Experiment(s):

High Energy Stereoscopic System

Appears in the scientific report 2018

Database coverage:
Medline

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; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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Record created 2018-06-18, last modified 2021-11-10

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