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2023•Unpublished venueOpen access

First results of pulsar observations with the LST-1

Alvaro Mas-Aguilar, Francesco Gabriele Saturni, The CTA-LST Project, Kazuki Abe, Shotaro Abe, Arnau Aguasca-Cabot, I. Agudo, Nuria Álvarez Crespo, Lucio Angelo Antonelli, C. Aramo, Axel Arbet-Engels, Cornelia Arcaro, Manuel Artero, Katsuaki Asano, Pierre Aubert, Ali Baktash, Aya Bamba, Andrés Baquero, Leonardo Baroncelli, U. Barres de Almeida, J. A. Barrio, Ivana Batković, Joshua Ryo Baxter, Josefa Becerra González, E. Bernardini, Mabel Bernardos, Juan Bernete Medrano, A. Berti, Pooja Bhattacharjee, Noah Biederbeck, C. Bigongiari, E. Bissaldi, Oscar Blanch, G. Bonnoli, Pol Bordas, Giulia Brunelli, Andrea A. Bulgarelli, Irene Burelli, L. Burmistrov, Mario Buscemi, Martina Cardillo, Sami Caroff, A. Carosi, Marie-Sophie Carrasco, Franca Cassol, D. Cauz, Davide Cerasole, Giovanni Ceribella, Yating Chai, K. S. Cheng, A. Chiavassa, Michiyuki Chikawa, L. Chytka, Alejo Cifuentes, J. L. Contreras, J. Cortina, H. Costantini, M. Dalchenko, F. Dazzi, Alessandro De Angelis, Mathieu de Bony de Lavergne, B. De Lotto, Mario de Lucia, Raniere de Menezes, L. del Peral, Guillaume Deleglise, Carlos Delgado, J. Delgado, Domenico Della Volpe, Michael Dellaiera, Ambra Di Piano, F. Di Pierro, Antonio Di Pilato, Riccardo Di Tria, L. Di Venere, C. Díaz, Rune Michael Dominik, D. Dominis Prester, Alice Donini, D. Dorner, Michele Doro, Laura Eisenberger, Dominik Elsässer, Gabriel Emery, Juan Escudero, Vandad Fallah Ramazani, Giovanna Ferrara, F. Ferrarotto, Armand Fiasson, L. Foffano, Lluís Freixas Coromina, Stefan Fröse, Satoshi Fukami, Yasushi Fukazawa, Enrique Rivera Garcí­a, Ramon J. García López, Claudio Gasbarra, D. Gasparrini, Felix Geyer, Joao Giesbrecht Paiva, N. Giglietto, Francesco Giordano, Paweł Gliwny, N. Godinović, Roger Grau Haro, Jarred Gershon Green, David Green, S. Gunji, Patrick S. Günther, Jonas Hackfeld, D. Hadasch, A. Hahn, Kazuaki Hashiyama, T. Hassan, Kohei Hayashi, Lea Heckmann, Matthieu Heller, Javier Herrera Llorente, Kouichi Hirotani, Dirk Hoffmann, Dieter Horns, Julien Houles, Miroslav Hrabovský, Dario Hrupec, David Hui, Moritz Hütten, Marco Iarlori, Ryo Imazawa, Tomohiro Inada, Yusuke Inome, Kunihito Ioka, M. Iori, Kazuma Ishio, Irene Jiménez Martínez, Jakub Jurýšek, Mika Kagaya, Vladimir Karas, Hideaki Katagiri, J. Kataoka, D. Kerszberg, Yukiho Kobayashi, Kazunori Kohri, Albert K. H. Kong, Hidetoshi Kubo, J. Kushida, María Láinez, Giovanni Lamanna, A. Lamastra, Thierry Le Flour, Maximilian Linhoff, Francesco Longo, Marcos López Moya, R. López-Coto, A. López-Oramas, S. Loporchio, Andrea Lorini, J. J. Lozano Bahilo, Pedro L. Luque‐Escamilla, P. Majumdar, M. Makariev, Dušan Mandát, M. Manganaro, Giulio Manicò, Karl Mannheim, Mosè Mariotti, Patricia Márquez, G. Marsella, Josep Martí, Oibar Martínez, Gustavo Martínez, Manel Martínez, Gilles Maurin, D. Mazin, Enrique Mestre Guillen, S. Mičanović, Davide Miceli, Tjark Miener, Jose Miguel Miranda, Razmik Mirzoyan, Tsunefumi Mizuno, Miguel Molero Gonzalez, E. Molina, T. Montaruli, Inocencio Monteiro, Abelardo Moralejo, Daniel Morcuende, Aldo Morselli, Víctor Moya, H. Muraishi, Kohta Murase, Shigehiro Nagataki, Takeshi Nakamori, Andrii Neronov, Lukas Nickel, M. Nievas Rosillo, K. Nishijima, Koji Noda, Dalibor Nosek, S. Nozaki, M. Ohishi, Yoshiki Ohtani, Tomohiko Oka, Akira Okumura, Reiko Orito, Jorge Otero-Santos, Michele Palatiello, David Paneque, Francesca Romana Pantaleo, R. Paoletti, Josep Maria Paredes, Miroslav Pech, Mario Pecimotika, M. Peresano, Felix Pfeiffle, Ermanno Pietropaolo, Giorgio Pirola, C. Plard, F. Podobnik, Vincent Poireau, Miguel Polo, Estelle Pons, E. Prandini, Julie Prast, G. Principe, Chaitanya Priyadarshi, M. Prouza, R. Rando, Wolgang Rhode, Marc Ribó, Chiara Righi, V. Rizi, Gonzalo Rodriguez Fernandez, M. D. Rodríguez-Friás, Takayuki Saito, Shunsuke Sakurai, David A. Sanchez, Toni Šarić, Yuri Sato, Francesco Gabriele Saturni, V. Savchenko, Bernd Schleicher, Felix Schmuckermaier, Jan Lukas Schubert, Fabian Schussler, Thomas Schweizer, M. Seglar-Arroyo, Thomas Siegert, Rainò Silvia, J. Sitarek, Vitalii Sliusar, Alessia Spolon, Jelena Strišković, M. Strzys, Yusuke Suda, H. Tajima, Mitsunari Takahashi, Hiromitsu TAKAHASHI, J. Takata, Ryuji Takeishi, P. Thomas Tam, Shuta J Tanaka, Dai Tateishi, Petar Temnikov, Y. Terada, Kenta Terauchi, T. Terzić, M. Teshima, Martin Tluczykont, Fuyuki Tokanai, Diego F. Torres, P. Trávnı́ček, Stefano Truzzi, Antonio Tutone, Martin Vacula, P. Vallania, Juliane van Scherpenberg, M. Vázquez Acosta, Ilaria Viale, Alessandro Armando Vigliano, Carlo Francesco Vigorito, Vincenzo Vitale, Georgios Gerasimos Voutsinas, Ievgen Vovk, Thomas Vuillaume, Roland Walter, Zhang Wei, Martin Will, Tokonatsu Yamamoto, Ryo Yamazaki, T. Yoshida, T. Yoshikoshi, Natalia Żywucka

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Abstract

After the discovery of Crab, Vela, and Geminga pulsars at Very High Energies, the search for new pulsars at tens of GeV has been gaining huge importance. However, their steep spectra along with the sensitivity of the current generation of Imaging Atmospheric Cherenkov telescopes (IACTs) are limiting the capability to detect more pulsars. The LST-1 is the first prototype of the Large-Sized Telescope of the forthcoming CTA observatory with enhanced sensitivity at tens of GeV. The LST-1 started its commissioning phase in 2018, and since then it has observed the Crab pulsar regularly. Here, we show the first results of the analysis of the Crab and other pulsars taken with the LST-1. The two characteristic emission peaks of the Crab pulsar, P1, and P2, are detected with high significance showing a clear improvement in sensitivity over the previous generation of IACTs. The spectrum is reconstructed up to 450 GeV for P1 and up to 700 GeV for P2. The low energy threshold of LST-1 also allows us to measure the spectrum of the Crab pulsar in the overlapping region with the Fermi-LAT and cross-calibrate both instruments. The results obtained with the first pulsar observations with the LST-1 confirm the excellent potential of LST telescopes to study and discover new pulsars in the near future.

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What this paper is about

After the discovery of Crab, Vela, and Geminga pulsars at Very High Energies, the search for new pulsars at tens of GeV has been gaining huge importance. However, their steep spectra along with the sensitivity of the current generation of Imaging Atmospheric Cherenkov telescopes (IACTs) are limiting the capability to detect more pulsars. The LST-1 is the first prototype of the Large-Sized Telescope of the forthcoming CTA observatory with enhanced sensitivity at tens of GeV. The LST-1 started its commissioning phase in 2018, and since then it has observed the Crab pulsar regularly. Here, we show the first results of the analysis of the Crab and other pulsars taken with the LST-1. The two characteristic emission peaks of the Crab pulsar, P1, and P2, are detected with high significance showing a clear improvement in sensitivity over the previous generation of IACTs. The spectrum is reconstructed up to 450 GeV for P1 and up to 700 GeV for P2. The low energy threshold of LST-1 also allows us to measure the spectrum of the Crab pulsar in the overlapping region with the Fermi-LAT and cross-calibrate both instruments. The results obtained with the first pulsar observations with the LST-1 confirm the excellent potential of LST telescopes to study and discover new pulsars in the near future.

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Available abstract

After the discovery of Crab, Vela, and Geminga pulsars at Very High Energies, the search for new pulsars at tens of GeV has been gaining huge importance. However, their steep spectra along with the sensitivity of the current generation of Imaging Atmospheric Cherenkov telescopes (IACTs) are limiting the capability to detect more pulsars. The LST-1 is the first prototype of the Large-Sized Telescope of the forthcoming CTA observatory with enhanced sensitivity at tens of GeV. The LST-1 started its commissioning phase in 2018, and since then it has observed the Crab pulsar regularly. Here, we show the first results of the analysis of the Crab and other pulsars taken with the LST-1. The two characteristic emission peaks of the Crab pulsar, P1, and P2, are detected with high significance showing a clear improvement in sensitivity over the previous generation of IACTs. The spectrum is reconstructed up to 450 GeV for P1 and up to 700 GeV for P2. The low energy threshold of LST-1 also allows us to measure the spectrum of the Crab pulsar in the overlapping region with the Fermi-LAT and cross-calibrate both instruments. The results obtained with the first pulsar observations with the LST-1 confirm the excellent potential of LST telescopes to study and discover new pulsars in the near future.

Key concepts: Pulsar, Physics, Crab Pulsar, Vela, Observatory, Astrophysics, Telescope, Cherenkov radiation

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