Garret Cotter: Publications

Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches

(2021)

Authors:

James Davies, Manuel Meyer, Garret Cotter

H.E.S.S. Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo

The Astrophysical Journal American Astronomical Society 923:1 (2021) 109

Authors:

H Abdalla, F Aharonian, F Ait Benkhali, EO Angüner, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, K Bernlöhr, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, R Brose, F Brun, T Bulik, T Bylund, F Cangemi, S Caroff, S Casanova, T Chand, A Chen, G Cotter, J Damascene Mbarubucyeye, J Devin, A Djannati-Ataï, K Egberts, J-P Ernenwein, S Fegan, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Funk, S Gabici, G Giavitto, L Giunti, D Glawion, JF Glicenstein, M-H Grondin, JA Hinton, M Hörbe, W Hofmann, TL Holch, M Holler, Zhiqiu Huang, D Huber, M Jamrozy, F Jankowsky, I Jung-Richardt, E Kasai, K Katarzyński, U Katz, B Khélifi, Nu Komin, R Konno, K Kosack, D Kostunin, A Kundu, G Lamanna, S Le Stum, A Lemière, M Lemoine-Goumard, J-P Lenain, F Leuschner, T Lohse, A Luashvili, I Lypova, J Mackey, J Majumdar, D Malyshev, V Marandon, P Marchegiani, G Martí-Devesa, R Marx, G Maurin, PJ Meintjes, A Mitchell, L Mohrmann, A Montanari, E Moulin, J Muller, T Murach, M de Naurois, A Nayerhoda, J Niemiec, A Priyana Noel, P O’Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, M Panter, RD Parsons, G Peron, V Poireau, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, P Reichherzer, M Renaud, F Rieger, G Rowell, B Rudak, H Rueda Ricarte, E Ruiz-Velasco, V Sahakian, S Sailer, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, F Schüssler, HM Schutte, U Schwanke, M Senniappan, JNS Shapopi, A Sinha, H Sol, A Specovius, S Spencer, Ł Stawarz, S Steinmassl, C Steppa, L Sun, T Takahashi, T Tanaka, R Terrier, C Thorpe-Morgan, M Tsirou, N Tsuji, Y Uchiyama, C van Eldik, J Veh, J Vink, SJ Wagner, F Werner, R White, A Wierzcholska, Yu Wun Wong, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, S Zouari, N Żywucka

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Redshift determination of blazars for the Cherenkov Telescope Array

Proceedings of the International Astronomical Union Cambridge University Press (CUP) 17:S375 (2021) 96-100

Authors:

E Kasai, P Goldoni, S Pita, C Boisson, M Backes, G Cotter, F D’Ammando, B van Soelen

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LMC N132D: a mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV

Astronomy and Astrophysics EDP Sciences 655 (2021) A7

Authors:

H Abdalla, F Aharonian, F Ait Benkhali, Eo Anguner, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, A Barnacka, M Barnard, R Batzofin, Y Becherini, D Berge, K Bernloehr, B Bi, M Boettcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, R Brose, F Brun, T Bulik, T Bylund, F Cangemi, S Caroff, S Casanova, J Catalano, P Chambery, T Chand, A Chen, G Cotter, M Curylo, J Damascene Mbarubucyeye, Id Davids, J Davies, J Devin, A Djannati-Atai, A Dmytriiev, A Donath, V Doroshenko, L Dreyer, L Du Plessis, C Duffy, K Egberts, S Einecke

Abstract:

Context Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-high-energy (VHE, >100 GeV) gamma-ray sources, but for only a few SNRs the hadronic cosmic-ray origin of their gamma-ray emission is indisputably established. In all these cases, the gamma-ray spectra exhibit a spectral cutoff at energies much below 100 TeV and thus do not reach the PeVatron regime.

Aims: The aim of this work was to achieve a firm detection for the oxygen-rich SNR LMC N132D in the VHE gamma-ray domain with an extended set of data, and to clarify the spectral characteristics and the localization of the gamma-ray emission from this exceptionally powerful gamma-ray-emitting SNR.

Methods: We analyzed 252 h of High Energy Stereoscopic System (H.E.S.S.) observations towards SNR N132D that were accumulated between December 2004 and March 2016 during a deep survey of the Large Magellanic Cloud, adding 104 h of observations to the previously published data set to ensure a > 5σ detection. To broaden the gamma-ray spectral coverage required for modeling the spectral energy distribution, an analysis of Fermi-LAT Pass 8 data was also included.

Results: We unambiguously detect N132D at VHE with a significance of 5.7σ. We report the results of a detailed analysis of its spectrum and localization based on the extended H.E.S.S. data set. The joint analysis of the extended H.E.S.S and Fermi-LAT data results in a spectral energy distribution in the energy range from 1.7 GeV to 14.8 TeV, which suggests a high luminosity of N132D at GeV and TeV energies. We set a lower limit on a gamma-ray cutoff energy of 8 TeV with a confidence level of 95%. The new gamma-ray spectrum as well as multiwavelength observations of N132D when compared to physical models suggests a hadronic origin of the VHE gamma-ray emission.

Conclusions: SNR N132D is a VHE gamma-ray source that shows a spectrum extending to the VHE domain without a spectral cutoff at a few TeV, unlike the younger oxygen-rich SNR Cassiopeia A. The gamma-ray emission is best explained by a dominant hadronic component formed by diffusive shock acceleration. The gamma-ray properties of N132D may be affected by an interaction with a nearby molecular cloud that partially lies inside the 95% confidence region of the source position.

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Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase

The Astrophysical Journal American Astronomical Society 919:2 (2021) 106

Authors:

H Abdalla, F Aharonian, F Ait Benkhali, EO Angüner, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, A Barnacka, M Barnard, Y Becherini, D Berge, K Bernlöhr, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, R Brose, F Brun, P Brun, M Bryan, M Büchele, T Bulik, T Bylund, F Cangemi, S Caroff, A Carosi, S Casanova, P Chambery, T Chand, S Chandra, A Chen, G Cotter, M Curyło, J Damascene Mbarubucyeye, ID Davids, J Davies, C Deil, J Devin, L Dirson, A Djannati-Ataï, A Dmytriiev, A Donath, V Doroshenko, L Dreyer, C Duffy, L Du Plessis, J Dyks, K Egberts, F Eichhorn, S Einecke, G Emery, J-P Ernenwein, K Feijen, S Fegan, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Funk, M Füßling, S Gabici, YA Gallant, S Ghafourizade, G Giavitto, L Giunti, D Glawion, JF Glicenstein, M-H Grondin, J Hahn, M Haupt, S Hattingh, G Hermann, JA Hinton, W Hofmann, C Hoischen, TL Holch, M Holler, M Hörbe, D Horns, Z Huang, D Huber, M Jamrozy, D Jankowsky, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, E Kasai, MA Kastendieck, K Katarzyński, U Katz, D Khangulyan, B Khélifi, S Klepser, W Kluźniak, Nu Komin, R Konno, K Kosack, D Kostunin, M Kreter, G Kukec Mezek, A Kundu, G Lamanna, A Lemière, M Lemoine-Goumard, J-P Lenain, S Le Stum, F Leuschner, C Levy, T Lohse, A Luashvili, I Lypova, J Mackey, J Majumdar, D Malyshev, D Malyshev, V Marandon, P Marchegiani, A Marcowith, A Mares, G Martí-Devesa, R Marx, G Maurin, PJ Meintjes, M Meyer, A Mitchell, R Moderski, L Mohrmann, A Montanari, C Moore, P Morris, E Moulin, J Muller, T Murach, K Nakashima, A Nayerhoda, M de Naurois, H Ndiyavala, J Niemiec, L Oakes, P O’Brien, H Odaka, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, G Peron, B Peyaud, Q Piel, S Pita, V Poireau, A Priyana Noel, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, S Raab, R Rauth, P Reichherzer, A Reimer, O Reimer, Q Remy, M Renaud, B Reville, F Rieger, L Rinchiuso, C Romoli, G Rowell, B Rudak, H Rueda Ricarte, E Ruiz-Velasco, V Sahakian, S Sailer, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, J Schäfer, F Schüssler, HM Schutte, U Schwanke, M Seglar-Arroyo, M Senniappan, AS Seyffert, N Shafi, JNS Shapopi, K Shiningayamwe, R Simoni, A Sinha, H Sol, H Spackman, A Specovius, S Spencer, M Spir-Jacob, Ł Stawarz, L Sun, R Steenkamp, C Stegmann, S Steinmassl, C Steppa, T Takahashi, T Tanaka, T Tavernier, AM Taylor, R Terrier, JHE Thiersen, C Thorpe-Morgan, D Tiziani, M Tluczykont, L Tomankova, C Trichard, M Tsirou, N Tsuji, R Tuffs, Y Uchiyama, DJ van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, P Vincent, J Vink, HJ Völk, Z Wadiasingh, SJ Wagner, J Watson, F Werner, R White, A Wierzcholska, P deWilt, Yu Wun Wong, H Yassin, A Yusafzai, M Zacharias, R Zanin, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, J Zorn, S Zouari, N Żywucka

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Garret Cotter

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Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches

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H.E.S.S. Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo

Authors:

Redshift determination of blazars for the Cherenkov Telescope Array

Authors:

LMC N132D: a mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV

Authors:

Abstract:

Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase

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Garret Cotter

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Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches

Authors:

H.E.S.S. Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo

Authors:

Redshift determination of blazars for the Cherenkov Telescope Array

Authors:

LMC N132D: a mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV

Authors:

Abstract:

Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase

Authors: