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Rosse Telescope

Garret Cotter

Professor of Physics

Research theme

  • Astronomy and astrophysics
  • Particle astrophysics & cosmology

Sub department

  • Astrophysics

Research groups

  • Pulsars, transients and relativistic astrophysics
  • The Square Kilometre Array (SKA)
  • Gamma-ray astronomy
Garret.Cotter@physics.ox.ac.uk
Telephone: 01865 (2)73604
Denys Wilkinson Building, room 705
  • About
  • Publications

H.E.S.S. follow-up observations of GRB221009A

(2023)

Authors:

HESS Collaboration, :, F Aharonian, F Ait Benkhali, J Aschersleben, H Ashkar, M Backes, A Baktash, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, K Bernlöhr, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, J Borowska, M Bouyahiaoui, F Bradascio, M Breuhaus, R Brose, 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, S Dai, J Damascene Mbarubucyeye, J Devin, A Djannati-Ataï, A Dmytriiev, V Doroshenko, K Egberts, S Einecke, J-P Ernenwein, S Fegan, G Fichet de Clairfontaine, M Filipovic, G Fontaine, M Füßling, S Funk, S Gabici, S Ghafourizadeh, G Giavitto, D Glawion, JF Glicenstein, P Goswami, G Grolleron, M-H Grondin JA Hinton, TL Holch, M Holler, D Horns, Zhiqiu Huang, M Jamrozy, F Jankowsky, V Joshi, I Jung-Richardt, E Kasai, K Katarzyński, R Khatoon, B Khélifi, W Kluźniak, Nu Komin, R Konno, K Kosack, D Kostunin, RG Lang, S Le Stum, F Leitl, A Lemière, M Lemoine-Goumard, JP Lenain, F Leuschner, T Lohse, I Lypova, J Mackey, D Malyshev, D Malyshev, V Marandon, P Marchegiani, A Marcowith, G Martí-Devesa, R Marx, M Meyer, A Mitchell, L Mohrmann, A Montanari, E Moulin, T Murach, K Nakashima, M de Naurois, J Niemiec, A Priyana Noel, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, G Peron, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, H Ren, M Renaud, B Reville, F Rieger, G Rowell, B Rudak, E Ruiz-Velasco, V Sahakian, H Salzmann, A Santangelo, M Sasaki, J Schäfer, F Schüssler, HM Schutte, U Schwanke, JNS Shapopi, A Specovius, S Spencer, Ł Stawarz, R Steenkamp, S Steinmassl, C Steppa, I Sushch, H Suzuki, T Takahashi, T Tanaka, R Terrier, N Tsuji, Y Uchiyama, M Vecchi, C Venter, J Vink, SJ Wagner, R White, A Wierzcholska, Yu Wun Wong, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, N Żywucka
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Optical Spectroscopy of Blazars for the Cherenkov Telescope Array -- II

(2022)

Authors:

E Kasai, P Goldoni, S Pita, DA Williams, W Max-Moerbeck, O Hervet, G Cotter, M Backes, C Boisson, J Becerra González, U Barres de Almeida, F D'Ammando, V Fallah Ramazani, E Lindfors
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Constraints on axionlike particles from a combined analysis of three flaring $\textit{Fermi}$ flat-spectrum radio quasars

(2022)

Authors:

James Davies, Manuel Meyer, Garret Cotter
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Optical spectroscopy of blazars for the Cherenkov Telescope Array – II

Monthly Notices of the Royal Astronomical Society Oxford University Press 518:2 (2022) 2675-2692

Authors:

E Kasai, P Goldoni, S Pita, Da Williams, W Max-Moerbeck, O Hervet, Garret Cotter, M Backes, C Boisson, J Becerra González, U Barres de Almeida, F D’Ammando, V Fallah Ramazani, E Lindfors

Abstract:

Active galactic nuclei (AGNs) make up about 35 per cent of the more than 250 sources detected in very high-energy (VHE) gamma rays to date with the imaging atmospheric Cherenkov telescopes. Apart from four nearby radio galaxies and two AGNs of unknown type, all known VHE AGNs are blazars. Knowledge of the cosmological redshift of gamma-ray blazars is key to enabling the study of their intrinsic emission properties, as the interaction between gamma rays and the extragalactic background light (EBL) results in a spectral softening. Therefore, the redshift determination exercise is crucial to indirectly placing tight constraints on the EBL density, and to studying blazar population evolution across cosmic time. Due to the powerful relativistic jets in blazars, most of their host galaxies’ spectral features are outshined, and dedicated high signal-to-noise (S/N) spectroscopic observations are required. Deep medium- to high-resolution spectroscopy of 33 gamma-ray blazar optical counterparts was performed with the European Southern Observatory, New Technology Telescope, Keck II telescope, Shane 3-metre telescope, and the Southern African Large Telescope. From the sample, spectra from 25 objects display spectral features or are featureless and have high S/N. The other eight objects have low-quality featureless spectra. We systematically searched for absorption and emission features and estimated, when possible, the fractional host galaxy flux in the measured total flux. Our measurements yielded 14 firm spectroscopic redshifts, ranging from 0.0838 to 0.8125, one tentative redshift, and two lower limits: one at z>0.382 and the other at z > 0.629.
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Details from ORA

Gamma-ray observations of MAXI J1820+070 during the 2018 outburst

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 517:4 (2022) 4736-4751

Authors:

H Abe, S Abe, VA Acciari, T Aniello, S Ansoldi, LA Antonelli, A Arbet Engels, C Arcaro, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, JA Barrio, I Batković, J Baxter, J Becerra González, W Bednarek, E Bernardini, M Bernardos, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, I Burelli, G Busetto, R Carosi, M Carretero-Castrillo, G Ceribella, Y Chai, A Chilingarian, S Cikota, E Colombo, JL Contreras, J Cortina, S Covino, G D’Amico, V D’Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, A Del Popolo, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, G Emery, V Fallah Ramazani, L Fariña, A Fattorini, L Font, C Fruck, S Fukami, Y Fukazawa, RJ García López, M Garczarczyk, S Gasparyan, M Gaug, JG Giesbrecht Paiva, N Giglietto, F Giordano, P Gliwny, N Godinović, R Grau, D Green, JG Green, D Hadasch, A Hahn, T Hassan, L Heckmann, J Herrera, J Hoang, D Hrupec, M Hütten, R Imazawa, T Inada, R Iotov, K Ishio, I Jiménez Martínez, J Jormanainen, D Kerszberg, Y Kobayashi, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, L Linhoff, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, A Lorini, E Lyard, B Machado de Oliveira Fraga, P Majumdar, M Makariev, G Maneva, N Mang, M Manganaro, S Mangano, K Mannheim, M Mariotti, M Martínez, A Mas Aguilar, D Mazin, S Menchiari, S Mender, S Mićanović, D Miceli, T Miener, JM Miranda, R Mirzoyan, E Molina, HA Mondal, A Moralejo, D Morcuende, V Moreno, T Nakamori, C Nanci, L Nava, V Neustroev, M Nievas Rosillo, C Nigro, K Nilsson, K Nishijima, T Njoh Ekoume, K Noda, S Nozaki, Y Ohtani, T Oka, A Okumura, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, JM Paredes, L Pavletić, M Persic, M Pihet, G Pirola, F Podobnik, PG Prada Moroni, E Prandini, G Principe, C Priyadarshi, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, N Sahakyan, T Saito, S Sakurai, K Satalecka, FG Saturni, B Schleicher, K Schmidt, F Schmuckermaier, JL Schubert, T Schweizer, J Sitarek, V Sliusar, D Sobczynska, A Spolon, A Stamerra, J Strišković, D Strom, M Strzys, Y Suda, T Surić, H Tajima, M Takahashi, R Takeishi, F Tavecchio, P Temnikov, K Terauchi, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, M Vazquez Acosta, S Ventura, V Verguilov, I Viale, CF Vigorito, V Vitale, I Vovk, R Walter, M Will, C Wunderlich, T Yamamoto, D Zarić, The MAGIC Collaboration, 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, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, F Bradascio, M Breuhaus, R Brose, F Brun, T Bulik, T Bylund, F Cangemi, S Caroff, S Casanova, M Cerruti, T Chand, S Chandra, A Chen, OU Chibueze, G Cotter, P Cristofari, J Damascene Mbarubucyeye, J Devin, A Djannati-Ataï, A Dmytriiev, K Egberts, J-P Ernenwein, A Fiasson, G Fichet de Clairfontaine, G Fontaine, M Füßling, S Funk, S Gabici, S Ghafourizadeh, G Giavitto, D Glawion, JF Glicenstein, P Goswami, G Grolleron, JA Hinton, M Hörbe, C Hoischen, TL Holch, M Holler, D Horns, Zhiqiu Huang, M Jamrozy, F Jankowsky, V Joshi, I Jung-Richardt, E Kasai, K Katarzyński, U Katz, B Khélifi, W Kluźniak, Nu Komin, K Kosack, D Kostunin, RG Lang, 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, D Malyshev, V Marandon, P Marchegiani, G Martí-Devesa, R Marx, G Maurin, M Meyer, A Mitchell, R Moderski, L Mohrmann, A Montanari, E Moulin, J Muller, T Murach, K Nakashima, M de Naurois, A Nayerhoda, J Niemiec, A Priyana Noel, P O’Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, V Poireau, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, M Renaud, F Rieger, G Rowell, B Rudak, H Rueda Ricarte, E Ruiz-Velasco, V Sahakian, H Salzmann, A Santangelo, M Sasaki, J Schäfer, F Schüssler, HM Schutte, U Schwanke, JNS Shapopi, H Sol, A Specovius, S Spencer, Ł Stawarz, R Steenkamp, S Steinmassl, C Steppa, I Sushch, H Suzuki, T Takahashi, T Tanaka, C Thorpe-Morgan, M Tluczykont, L Tomankova, N Tsuji, Y Uchiyama, C van Eldik, B van Soelen, M Vecchi, J Veh, C Venter, J Vink, SJ Wagner, R White, A Wierzcholska, Yu Wun Wong, A Yusafzai, M Zacharias, R Zanin, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, S Zouari, N Żywucka, The HESS Collaboration, A Acharyya, CB Adams, P Batista, W Benbow, M Capasso, JL Christiansen, AJ Chromey, M Errando, A Falcone, Q Feng, JP Finley, JM Foote, L Fortson, A Furniss, A Gent, WF Hanlon, O Hervet, J Holder, B Hona, TB Humensky, W Jin, P Kaaret, M Kertzman, M Kherlakian, TK Kleiner, S Kumar, MJ Lang, M Lundy, G Maier, CE McGrath, J Millis, P Moriarty, R Mukherjee, S O’Brien, RA Ong, N Park, SR Patel, K Pfrang, M Pohl, E Pueschel, J Quinn, K Ragan, PT Reynolds, D Ribeiro, E Roache, JL Ryan, I Sadeh, L Saha, M Santander, GH Sembroski, R Shang, M Splettstoesser, D Tak, JV Tucci, A Weinstein, DA Williams, TJ Williamson, The VERITAS Collaboration, V Bosch-Ramon, C Celma, M Linares, DM Russell, G Sala
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