Abstract
Diffuse γ-ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeV energies over several decades, assessments of diffuse γ-ray emission at TeV energies remain sparse. After completion of the systematic survey of the inner Galaxy, the H.E.S.S. experiment is in a prime position to observe large-scale diffuse emission at TeV energies. Data of the H.E.S.S. Galactic Plane Survey are investigated in regions off known γ-ray sources. Corresponding γ-ray flux measurements were made over an extensive grid of celestial locations. Longitudinal and latitudinal profiles of the observed γ-ray fluxes show characteristic excess emission not attributable to known γ-ray sources. For the first time large-scale γ-ray emission along the Galactic plane using imaging atmospheric Cherenkov telescopes has been observed. While the background subtraction technique limits the ability to recover modest variation on the scale of the H.E.S.S. field of view or larger, which is characteristic of the inverse Compton scatter-induced Galactic diffuse emission, contributions of neutral pion decay as well as emission from unresolved γ-ray sources can be recovered in the observed signal to a large fraction. Calculations show that the minimum γ-ray emission from π0 decay represents a significant contribution to the total signal. This detection is interpreted as a mix of diffuse Galactic γ-ray emission and unresolved sources.
| Original language | English (US) |
|---|---|
| Article number | 122007 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 90 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 30 2014 |
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Diffuse Galactic gamma-ray emission with H.E.S.S. / Abramowski, A.; Aharonian, F.; Ait Benkhali, F.; Akhperjanian, A. G.; Angüner, E. O.; Backes, M.; Balenderan, S.; Balzer, A.; Barnacka, A.; Becherini, Y.; Becker Tjus, J.; Berge, D.; Bernhard, S.; Bernlöhr, K.; Birsin, E.; Biteau, J.; Böttcher, M.; Boisson, C.; Bolmont, J.; Bordas, P.; Bregeon, J.; Brun, F.; Brun, P.; Bryan, M.; Bulik, T.; Carrigan, S.; Casanova, S.; Chadwick, P. M.; Chakraborty, N.; Chalme-Calvet, R.; Chaves, R. C G; Chrétien, M.; Colafrancesco, S.; Cologna, G.; Conrad, J.; Couturier, C.; Cui, Y.; Davids, I. D.; Degrange, B.; Deil, C.; Dewilt, P.; Djannati-Ataï, A.; Domainko, W.; Donath, A.; Drury, L. O C; Dubus, G.; Dutson, K.; Dyks, J.; Dyrda, M.; Edwards, T.; Egberts, K.; Eger, P.; Espigat, P.; Farnier, C.; Fegan, S.; Feinstein, F.; Fernandes, M. V.; Fernandez, D.; Fiasson, A.; Fontaine, G.; Förster, A.; Füßling, M.; Gabici, S.; Gajdus, M.; Gallant, Y. A.; Garrigoux, T.; Giavitto, G.; Giebels, B.; Glicenstein, J. F.; Gottschall, D.; Grondin, M. H.; Grudzińska, M.; Hadasch, D.; Häffner, S.; Hahn, J.; Harris, J.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hervet, O.; Hillert, A.; Hinton, J. A.; Hofmann, W.; Hofverberg, P.; Holler, M.; Horns, D.; Ivascenko, A.; Jacholkowska, A.; Jahn, C.; Jamrozy, M.; Janiak, M.; Jankowsky, F.; Jung-Richardt, I.; Kastendieck, M. A.; Katarzyński, K.; Katz, U.; Kaufmann, S.; Khélifi, B.; Kieffer, M.; Klepser, S.; Klochkov, D.; Kluźniak, W.; Kolitzus, D.; Komin, Nu; Kosack, K.; Krakau, S.; Krayzel, F.; Krüger, P. P.; Laffon, H.; Lamanna, G.; Lefaucheur, J.; Lefranc, V.; Lemière, A.; Lemoine-Goumard, M.; Lenain, J. P.; Lohse, T.; Lopatin, A.; Lu, C. C.; Marandon, V.; Marcowith, A.; Marx, R.; Maurin, G.; Maxted, N.; Mayer, M.; McComb, T. J L; Méhault, J.; Meintjes, P. J.; Menzler, U.; Meyer, M.; Mitchell, A. M W; Moderski, R.; Mohamed, M.; Morå, K.; Moulin, E.; Murach, T.; De Naurois, M.; Niemiec, J.; Nolan, S. J.; Oakes, L.; Odaka, H.; Ohm, S.; Opitz, B.; Ostrowski, M.; Oya, I.; Panter, M.; Parsons, R. D.; Paz Arribas, M.; Pekeur, N. W.; Pelletier, G.; Petrucci, P. O.; Peyaud, B.; Pita, S.; Poon, H.; Pühlhofer, G.; Punch, M.; Quirrenbach, A.; Raab, S.; Reichardt, I.; Reimer, A.; Reimer, O.; Renaud, M.; De Los Reyes, R.; Rieger, F.; Romoli, C.; Rosier-Lees, S.; Rowell, G.; Rudak, B.; Rulten, C. B.; Sahakian, V.; Salek, D.; Sanchez, D. A.; Santangelo, A.; Schlickeiser, R.; Schüssler, F.; Schulz, A.; Schwanke, U.; Schwarzburg, S.; Schwemmer, S.; Sol, H.; Spanier, F.; Spengler, G.; Spies, F.; Stawarz, A. L.; Steenkamp, R.; Stegmann, C.; Stinzing, F.; Stycz, K.; Sushch, I.; Tavernet, J. P.; Tavernier, T.; Taylor, A. M.; Terrier, R.; Tluczykont, M.; Trichard, C.; Valerius, K.; Van Eldik, C.; Van Soelen, B.; Vasileiadis, G.; Veh, J.; Venter, C.; Viana, A.; Vincent, P.; Vink, J.; 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.; Zaborov, D.; Zacharias, M.; Zdziarski, A. A.; Zech, A.; Zechlin, H. S.; Fukui, Y.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 90, No. 12, 122007, 30.12.2014.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Diffuse Galactic gamma-ray emission with H.E.S.S.
AU - Abramowski, A.
AU - Aharonian, F.
AU - Ait Benkhali, F.
AU - Akhperjanian, A. G.
AU - Angüner, E. O.
AU - Backes, M.
AU - Balenderan, S.
AU - Balzer, A.
AU - Barnacka, A.
AU - Becherini, Y.
AU - Becker Tjus, J.
AU - Berge, D.
AU - Bernhard, S.
AU - Bernlöhr, K.
AU - Birsin, E.
AU - Biteau, J.
AU - Böttcher, M.
AU - Boisson, C.
AU - Bolmont, J.
AU - Bordas, P.
AU - Bregeon, J.
AU - Brun, F.
AU - Brun, P.
AU - Bryan, M.
AU - Bulik, T.
AU - Carrigan, S.
AU - Casanova, S.
AU - Chadwick, P. M.
AU - Chakraborty, N.
AU - Chalme-Calvet, R.
AU - Chaves, R. C G
AU - Chrétien, M.
AU - Colafrancesco, S.
AU - Cologna, G.
AU - Conrad, J.
AU - Couturier, C.
AU - Cui, Y.
AU - Davids, I. D.
AU - Degrange, B.
AU - Deil, C.
AU - Dewilt, P.
AU - Djannati-Ataï, A.
AU - Domainko, W.
AU - Donath, A.
AU - Drury, L. O C
AU - Dubus, G.
AU - Dutson, K.
AU - Dyks, J.
AU - Dyrda, M.
AU - Edwards, T.
AU - Egberts, K.
AU - Eger, P.
AU - Espigat, P.
AU - Farnier, C.
AU - Fegan, S.
AU - Feinstein, F.
AU - Fernandes, M. V.
AU - Fernandez, D.
AU - Fiasson, A.
AU - Fontaine, G.
AU - Förster, A.
AU - Füßling, M.
AU - Gabici, S.
AU - Gajdus, M.
AU - Gallant, Y. A.
AU - Garrigoux, T.
AU - Giavitto, G.
AU - Giebels, B.
AU - Glicenstein, J. F.
AU - Gottschall, D.
AU - Grondin, M. H.
AU - Grudzińska, M.
AU - Hadasch, D.
AU - Häffner, S.
AU - Hahn, J.
AU - Harris, J.
AU - Heinzelmann, G.
AU - Henri, G.
AU - Hermann, G.
AU - Hervet, O.
AU - Hillert, A.
AU - Hinton, J. A.
AU - Hofmann, W.
AU - Hofverberg, P.
AU - Holler, M.
AU - Horns, D.
AU - Ivascenko, A.
AU - Jacholkowska, A.
AU - Jahn, C.
AU - Jamrozy, M.
AU - Janiak, M.
AU - Jankowsky, F.
AU - Jung-Richardt, I.
AU - Kastendieck, M. A.
AU - Katarzyński, K.
AU - Katz, U.
AU - Kaufmann, S.
AU - Khélifi, B.
AU - Kieffer, M.
AU - Klepser, S.
AU - Klochkov, D.
AU - Kluźniak, W.
AU - Kolitzus, D.
AU - Komin, Nu
AU - Kosack, K.
AU - Krakau, S.
AU - Krayzel, F.
AU - Krüger, P. P.
AU - Laffon, H.
AU - Lamanna, G.
AU - Lefaucheur, J.
AU - Lefranc, V.
AU - Lemière, A.
AU - Lemoine-Goumard, M.
AU - Lenain, J. P.
AU - Lohse, T.
AU - Lopatin, A.
AU - Lu, C. C.
AU - Marandon, V.
AU - Marcowith, A.
AU - Marx, R.
AU - Maurin, G.
AU - Maxted, N.
AU - Mayer, M.
AU - McComb, T. J L
AU - Méhault, J.
AU - Meintjes, P. J.
AU - Menzler, U.
AU - Meyer, M.
AU - Mitchell, A. M W
AU - Moderski, R.
AU - Mohamed, M.
AU - Morå, K.
AU - Moulin, E.
AU - Murach, T.
AU - De Naurois, M.
AU - Niemiec, J.
AU - Nolan, S. J.
AU - Oakes, L.
AU - Odaka, H.
AU - Ohm, S.
AU - Opitz, B.
AU - Ostrowski, M.
AU - Oya, I.
AU - Panter, M.
AU - Parsons, R. D.
AU - Paz Arribas, M.
AU - Pekeur, N. W.
AU - Pelletier, G.
AU - Petrucci, P. O.
AU - Peyaud, B.
AU - Pita, S.
AU - Poon, H.
AU - Pühlhofer, G.
AU - Punch, M.
AU - Quirrenbach, A.
AU - Raab, S.
AU - Reichardt, I.
AU - Reimer, A.
AU - Reimer, O.
AU - Renaud, M.
AU - De Los Reyes, R.
AU - Rieger, F.
AU - Romoli, C.
AU - Rosier-Lees, S.
AU - Rowell, G.
AU - Rudak, B.
AU - Rulten, C. B.
AU - Sahakian, V.
AU - Salek, D.
AU - Sanchez, D. A.
AU - Santangelo, A.
AU - Schlickeiser, R.
AU - Schüssler, F.
AU - Schulz, A.
AU - Schwanke, U.
AU - Schwarzburg, S.
AU - Schwemmer, S.
AU - Sol, H.
AU - Spanier, F.
AU - Spengler, G.
AU - Spies, F.
AU - Stawarz, A. L.
AU - Steenkamp, R.
AU - Stegmann, C.
AU - Stinzing, F.
AU - Stycz, K.
AU - Sushch, I.
AU - Tavernet, J. P.
AU - Tavernier, T.
AU - Taylor, A. M.
AU - Terrier, R.
AU - Tluczykont, M.
AU - Trichard, C.
AU - Valerius, K.
AU - Van Eldik, C.
AU - Van Soelen, B.
AU - Vasileiadis, G.
AU - Veh, J.
AU - Venter, C.
AU - Viana, A.
AU - Vincent, P.
AU - Vink, J.
AU - Völk, H. J.
AU - Volpe, F.
AU - Vorster, M.
AU - Vuillaume, T.
AU - Wagner, S. J.
AU - Wagner, P.
AU - Wagner, R. M.
AU - Ward, M.
AU - Weidinger, M.
AU - Weitzel, Q.
AU - White, R.
AU - Wierzcholska, A.
AU - Willmann, P.
AU - Wörnlein, A.
AU - Wouters, D.
AU - Yang, R.
AU - Zabalza, V.
AU - Zaborov, D.
AU - Zacharias, M.
AU - Zdziarski, A. A.
AU - Zech, A.
AU - Zechlin, H. S.
AU - Fukui, Y.
N1 - Publisher Copyright: © 2014 American Physical Society. Copyright: Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2014/12/30
Y1 - 2014/12/30
N2 - Diffuse γ-ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeV energies over several decades, assessments of diffuse γ-ray emission at TeV energies remain sparse. After completion of the systematic survey of the inner Galaxy, the H.E.S.S. experiment is in a prime position to observe large-scale diffuse emission at TeV energies. Data of the H.E.S.S. Galactic Plane Survey are investigated in regions off known γ-ray sources. Corresponding γ-ray flux measurements were made over an extensive grid of celestial locations. Longitudinal and latitudinal profiles of the observed γ-ray fluxes show characteristic excess emission not attributable to known γ-ray sources. For the first time large-scale γ-ray emission along the Galactic plane using imaging atmospheric Cherenkov telescopes has been observed. While the background subtraction technique limits the ability to recover modest variation on the scale of the H.E.S.S. field of view or larger, which is characteristic of the inverse Compton scatter-induced Galactic diffuse emission, contributions of neutral pion decay as well as emission from unresolved γ-ray sources can be recovered in the observed signal to a large fraction. Calculations show that the minimum γ-ray emission from π0 decay represents a significant contribution to the total signal. This detection is interpreted as a mix of diffuse Galactic γ-ray emission and unresolved sources.
AB - Diffuse γ-ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeV energies over several decades, assessments of diffuse γ-ray emission at TeV energies remain sparse. After completion of the systematic survey of the inner Galaxy, the H.E.S.S. experiment is in a prime position to observe large-scale diffuse emission at TeV energies. Data of the H.E.S.S. Galactic Plane Survey are investigated in regions off known γ-ray sources. Corresponding γ-ray flux measurements were made over an extensive grid of celestial locations. Longitudinal and latitudinal profiles of the observed γ-ray fluxes show characteristic excess emission not attributable to known γ-ray sources. For the first time large-scale γ-ray emission along the Galactic plane using imaging atmospheric Cherenkov telescopes has been observed. While the background subtraction technique limits the ability to recover modest variation on the scale of the H.E.S.S. field of view or larger, which is characteristic of the inverse Compton scatter-induced Galactic diffuse emission, contributions of neutral pion decay as well as emission from unresolved γ-ray sources can be recovered in the observed signal to a large fraction. Calculations show that the minimum γ-ray emission from π0 decay represents a significant contribution to the total signal. This detection is interpreted as a mix of diffuse Galactic γ-ray emission and unresolved sources.
UR - http://www.scopus.com/inward/record.url?scp=84920112052&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84920112052&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.90.122007
DO - 10.1103/PhysRevD.90.122007
M3 - Article
AN - SCOPUS:84920112052
VL - 90
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 12
M1 - 122007
ER -