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H.E.S.S. observations of the 2021 periastron passage of PSR B1259-63/LS 2883

PSR B1259-63/LS 2883 is a gamma-ray binary system that hosts a pulsar in an eccentric orbit, with a 3.4 yr period, around an O9.5Ve star (LS 2883). At orbital phases close to periastron passages, the system radiates bright and variable non-thermal emission, for which the temporal and spectral proper...

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Main Authors: Aharonian, Felix A. (Author) , Ait Benkhali, Faical (Author) , Aschersleben, J. (Author) , Ashkar, H. (Author) , Backes, M. (Author) , Barbosa Martins, V. (Author) , Batzofin, R. (Author) , Becherini, Y. (Author) , Berge, D. (Author) , Bernlöhr, Konrad (Author) , Böttcher, M. (Author) , Boisson, C. (Author) , Bolmont, J. (Author) , De Bony De Lavergne, M. (Author) , Borowska, J. (Author) , Bouyahiaoui, M. (Author) , Brose, R. (Author) , Brown, A. (Author) , Brun, F. (Author) , Bruno, B. (Author) , Bulik, T. (Author) , Burger-Scheidlin, C. (Author) , Caroff, S. (Author) , Casanova, Sabrina (Author) , Celic, J. (Author) , Cerruti, M. (Author) , Chand, T. (Author) , Chandra, S. (Author) , Chen, A. (Author) , Chibueze, J. (Author) , Chibueze, O. (Author) , Cotter, G. (Author) , Damascene Mbarubucyeye, J. (Author) , Devin, J. (Author) , Djuvsland, Julia Isabell (Author) , Dmytriiev, A. (Author) , Egberts, K. (Author) , Einecke, S. (Author) , Ernenwein, J.-P. (Author) , Fontaine, G. (Author) , Funk, S. (Author) , Gabici, S. (Author) , Gallant, Y. A. (Author) , Glawion, D. (Author) , Glicenstein, J. F. (Author) , Goswami, P. (Author) , Grolleron, G. (Author) , Haerer, L. (Author) , Heß, B. (Author) , Hofmann, Werner (Author) , Holch, T. L. (Author) , Holler, M. (Author) , Huang, Zhiqiu (Author) , Jamrozy, M. (Author) , Jankowsky, Felix (Author) , Joshi, V. (Author) , Jung-Richardt, I. (Author) , Kasai, E. (Author) , Katarzyński, K. (Author) , Khangulyan, D. (Author) , Khatoon, R. (Author) , Khélifi, B. (Author) , Kluźniak, W. (Author) , Komin, Nu. (Author) , Kosack, K. (Author) , Kostunin, D. (Author) , Kundu, A. (Author) , Lang, R. G. (Author) , Le Stum, S. (Author) , Leitl, F. (Author) , Lemière, A. (Author) , Lemoine-Goumard, M. (Author) , Lenain, J.-P. (Author) , Leuschner, F. (Author) , Mackey, J. (Author) , Malyshev, D. (Author) , Martí-Devesa, G. (Author) , Marx, Ramin (Author) , Mehta, A. (Author) , Meintjes, P. J. (Author) , Mitchell, A. (Author) , Moderski, R. (Author) , Mohrmann, L. (Author) , Montanari, Alessandro (Author) , Moulin, E. (Author) , Murach, T. (Author) , De Naurois, M. (Author) , Niemiec, J. (Author) , Ohm, S. (Author) , De Ona Wilhelmi, E. (Author) , Ostrowski, M. (Author) , Panny, S. (Author) , Panter, M. (Author) , Parsons, R. D. (Author) , Pensec, U. (Author) , Peron, G. (Author) , Prokhorov, D. A. (Author) , Pühlhofer, G. (Author) , Punch, M. (Author) , Quirrenbach, Andreas (Author) , Regeard, M. (Author) , Reimer, A. (Author) , Reimer, O. (Author) , Reis, I. (Author) , Ren, H. (Author) , Rieger, Frank M. (Author) , Rudak, B. (Author) , Ruiz Velasco, Edna Loredana (Author) , Sahakian, V. (Author) , Salzmann, H. (Author) , Santangelo, A. (Author) , Sasaki, M. (Author) , Schäfer, J. (Author) , Schüssler, F. (Author) , Schutte, H. M. (Author) , Shapopi, J. N. S. (Author) , Spencer, S. (Author) , Stawarz, Ł. (Author) , Steenkamp, R. (Author) , Steinmaßl, Simon (Author) , Steppa, C. (Author) , Streil, K. (Author) , Sushch, I. (Author) , Takahashi, T. (Author) , Tanaka, T. (Author) , Taylor, A. M. (Author) , Terrier, R. (Author) , Thorpe-Morgan, C. (Author) , Tluczykont, M. (Author) , Unbehaun, T. (Author) , Van Eldik, C. (Author) , Van Soelen, B. (Author) , Vecchi, M. (Author) , Venter, C. (Author) , Vink, J. (Author) , Wach, T. (Author) , Wagner, Stefan (Author) , Werner, F. (Author) , Wierzcholska, A. (Author) , Zacharias, Michael (Author) , Zdziarski, A. A. (Author) , Zech, A. (Author) , Żywucka, N. (Author)
Corporate Author: H.E.S.S. Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 15 July 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 687, Pages: 1-14
ISSN:1432-0746
DOI:10.1051/0004-6361/202449612
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202449612
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/10.1051/0004-6361/202449612
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Author Notes:H.E.S.S. Collaboration, F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, K. Bernlöhr, M. Böttcher, C. Boisson, J. Bolmont, M. De Bony De Lavergne, J. Borowska, M. Bouyahiaoui, R. Brose, A. Brown, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Caroff, S. Casanova, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, J. Damascene Mbarubucyeye, J. Devin, J. Djuvsland, A. Dmytriiev, K. Egberts, S. Einecke, J.-P. Ernenwein, G. Fontaine, S. Funk, S. Gabici, Y. A. Gallant, D. Glawion, J. F. Glicenstein, P. Goswami, G. Grolleron, L. Haerer, B. Heß, W. Hofmann, T. L. Holch, M. Holler, Zhiqiu Huang, M. Jamrozy, F. Jankowsky, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzyński, D. Khangulyan, R. Khatoon, B. Khélifi, W. Kluźniak, Nu. Komin, K. Kosack, D. Kostunin, A. Kundu, R. G. Lang, S. Le Stum, F. Leitl, A. Lemière, M. Lemoine-Goumard, J.-P. Lenain, F. Leuschner, J. Mackey, D. Malyshev, G. Martí-Devesa, R. Marx, A. Mehta, P. J. Meintjes, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, E. Moulin, T. Murach, M. De Naurois, J. Niemiec, S. Ohm, E. De Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, R. D. Parsons, U. Pensec, G. Peron, D. A. Prokhorov, G. Pühlhofer, M. Punch, A. Quirrenbach, M. Regeard, A. Reimer, O. Reimer, I. Reis, H. Ren, F. Rieger, B. Rudak, E. Ruiz-Velasco, V. Sahakian, H. Salzmann, A. Santangelo, M. Sasaki, J. Schäfer, F. Schüssler, H. M. Schutte, J. N. S. Shapopi, S. Spencer, Ł. Stawarz, R. Steenkamp, S. Steinmassl, C. Steppa, K. Streil, I. Sushch, T. Takahashi, T. Tanaka, A. M. Taylor, R. Terrier, C. Thorpe-Morgan, M. Tluczykont, T. Unbehaun, C. Van Eldik, B. Van Soelen, M. Vecchi, C. Venter, J. Vink, T. Wach, S. J. Wagner, F. Werner, A. Wierzcholska, M. Zacharias, A. A. Zdziarski, A. Zech, N. Żywucka

MARC

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245 1 0 |a H.E.S.S. observations of the 2021 periastron passage of PSR B1259-63/LS 2883  |c H.E.S.S. Collaboration, F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, K. Bernlöhr, M. Böttcher, C. Boisson, J. Bolmont, M. De Bony De Lavergne, J. Borowska, M. Bouyahiaoui, R. Brose, A. Brown, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Caroff, S. Casanova, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, J. Damascene Mbarubucyeye, J. Devin, J. Djuvsland, A. Dmytriiev, K. Egberts, S. Einecke, J.-P. Ernenwein, G. Fontaine, S. Funk, S. Gabici, Y. A. Gallant, D. Glawion, J. F. Glicenstein, P. Goswami, G. Grolleron, L. Haerer, B. Heß, W. Hofmann, T. L. Holch, M. Holler, Zhiqiu Huang, M. Jamrozy, F. Jankowsky, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzyński, D. Khangulyan, R. Khatoon, B. Khélifi, W. Kluźniak, Nu. Komin, K. Kosack, D. Kostunin, A. Kundu, R. G. Lang, S. Le Stum, F. Leitl, A. Lemière, M. Lemoine-Goumard, J.-P. Lenain, F. Leuschner, J. Mackey, D. Malyshev, G. Martí-Devesa, R. Marx, A. Mehta, P. J. Meintjes, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, E. Moulin, T. Murach, M. De Naurois, J. Niemiec, S. Ohm, E. De Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, R. D. Parsons, U. Pensec, G. Peron, D. A. Prokhorov, G. Pühlhofer, M. Punch, A. Quirrenbach, M. Regeard, A. Reimer, O. Reimer, I. Reis, H. Ren, F. Rieger, B. Rudak, E. Ruiz-Velasco, V. Sahakian, H. Salzmann, A. Santangelo, M. Sasaki, J. Schäfer, F. Schüssler, H. M. Schutte, J. N. S. Shapopi, S. Spencer, Ł. Stawarz, R. Steenkamp, S. Steinmassl, C. Steppa, K. Streil, I. Sushch, T. Takahashi, T. Tanaka, A. M. Taylor, R. Terrier, C. Thorpe-Morgan, M. Tluczykont, T. Unbehaun, C. Van Eldik, B. Van Soelen, M. Vecchi, C. Venter, J. Vink, T. Wach, S. J. Wagner, F. Werner, A. Wierzcholska, M. Zacharias, A. A. Zdziarski, A. Zech, N. Żywucka 
264 1 |c 15 July 2024 
300 |a 14 
336 |a Text  |b txt  |2 rdacontent 
337 |a Computermedien  |b c  |2 rdamedia 
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500 |a Gesehen am 14.04.2025 
520 |a PSR B1259-63/LS 2883 is a gamma-ray binary system that hosts a pulsar in an eccentric orbit, with a 3.4 yr period, around an O9.5Ve star (LS 2883). At orbital phases close to periastron passages, the system radiates bright and variable non-thermal emission, for which the temporal and spectral properties of this emission are, for now, poorly understood. In this regard, very high-energy (VHE) emission is especially useful to study and constrain radiation processes and particle acceleration in the system. We report on an extensive VHE observation campaign conducted with the High Energy Stereoscopic System, comprised of approximately 100 h of data taken over five months, from tp − 24 days to tp + 127 days around the system’s 2021 periastron passage (where tp is the time of periastron). We also present the timing and spectral analyses of the source. The VHE light curve in 2021 is consistent overall with the stacked light curve of all previous observations. Within the light curve, we report a VHE maximum at times coincident with the third X-ray peak first detected in the 2021 X-ray light curve. In the light curve - although sparsely sampled in this time period - we see no VHE enhancement during the second disc crossing. In addition, we see no correspondence to the 2021 GeV flare in the VHE light curve. The VHE spectrum obtained from the analysis of the 2021 dataset is best described by a power law of spectral index Γ = 2.65±0.04stat ±0.04sys, a value consistent with the spectral index obtained from the analysis of data collected with H.E.S.S. during the previous observations of the source. We report spectral variability with a difference of ∆Γ = 0.56 ± 0.18stat ± 0.10sys at 95% confidence intervals, between sub-periods of the 2021 dataset. We also detail our investigation into X-ray/TeV and GeV/TeV flux correlations in the 2021 periastron passage. We find a linear correlation between contemporaneous flux values of X-ray and TeV datasets, detected mainly after tp + 25 days, suggesting a change in the available energy for non-thermal radiation processes. We detect no significant correlation between GeV and TeV flux points, within the uncertainties of the measurements, from ∼tp − 23 days to ∼tp + 126 days. This suggests that the GeV and TeV emission originate from different electron populations. 
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