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Performance and first measurements of the MAGIC Stellar Intensity Interferometer

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arxiv 2402.04755 v1 pith:J2F6BPH6 submitted 2024-02-07 astro-ph.IM astro-ph.SR

Performance and first measurements of the MAGIC Stellar Intensity Interferometer

MAGIC Collaboration: S. Abe , J. Abhir , V. A. Acciari , A. Aguasca-Cabot , I. Agudo , T. Aniello , S. Ansoldi , L. A. Antonelli
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A. Arbet Engels C. Arcaro M. Artero K. Asano A. Babi\'c A. Baquero U. Barres de Almeida J. A. Barrio I. Batkovi\'c A. Bautista J. Baxter J. Becerra Gonz\'alez E. Bernardini M. Bernardos J. Bernete A. Berti J. Besenrieder C. Bigongiari A. Biland O. Blanch \v{Z}. Bo\v{s}njak I. Burelli G. Busetto A. Campoy-Ordaz A. Carosi R. Carosi M. Carretero-Castrillo G. Ceribella Y. Chai A. Cifuentes E. Colombo J. L. Contreras J. Cortina S. Covino G. D'Amico V. D'Elia P. Da Vela F. Dazzi A. De Angelis B. De Lotto R. de Menezes A. Del Popolo M. Delfino J. Delgado C. Delgado Mendez F. Di Pierro L. Di Venere D. Dominis Prester A. Donini D. Dorner M. Doro D. Elsaesser G. Emery J. Escudero L. Fari na A. Fattorini L. Foffano L. Font S. Fr\"ose S. Fukami Y. Fukazawa R. J. Garc\'ia L\'opez M. Garczarczyk S. Gasparyan M. Gaug J. G. Giesbrecht Paiva N. Giglietto F. Giordano P. Gliwny T. Gradetzke R. Grau D. Green J. G. Green P. G\"unther D. Hadasch A. Hahn T. Hassan L. Heckmann J. Herrera D. Hrupec M. H\"utten R. Imazawa K. Ishio I. Jim\'enez Mart\'inez J. Jormanainen T. Kayanoki D. Kerszberg G. W. Kluge Y. Kobayashi P. M. Kouch H. Kubo J. Kushida M. L\'ainez A. Lamastra F. Leone E. Lindfors L. Linhoff S. Lombardi F. Longo R. L\'opez-Coto M. L\'opez-Moya A. L\'opez-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. Mart\'inez M. Mart\'inez-Chicharro A. Mas-Aguilar D. Mazin S. Menchiari S. Mender D. Miceli T. Miener J. M. Miranda R. Mirzoyan M. Molero Gonz\'alez E. Molina H. A. Mondal A. Moralejo D. Morcuende T. Nakamori C. Nanci V. Neustroev L. Nickel M. Nievas Rosillo C. Nigro L. Nikoli\'c K. Nilsson K. Nishijima T. Njoh Ekoume K. Noda S. Nozaki Y. Ohtani A. Okumura J. Otero-Santos S. Paiano M. Palatiello D. Paneque R. Paoletti J. M. Paredes M. Peresano M. Persic M. Pihet G. Pirola F. Podobnik P. G. Prada Moroni E. Prandini G. Principe C. Priyadarshi W. Rhode M. Rib\'o J. Rico C. Righi N. Sahakyan T. Saito K. Satalecka F. G. Saturni B. Schleicher K. Schmidt F. Schmuckermaier J. L. Schubert T. Schweizer A. Sciaccaluga G. Silvestri J. Sitarek V. Sliusar D. Sobczynska A. Spolon A. Stamerra J. Stri\v{s}kovi\'c D. Strom M. Strzys Y. Suda T. Suri\'c S. Suutarinen H. Tajima M. Takahashi R. Takeishi P. Temnikov K. Terauchi T. Terzi\'c M. Teshima S. Truzzi A. Tutone S. Ubach J. van Scherpenberg M. Vazquez Acosta S. Ventura I. Viale C. F. Vigorito V. Vitale R. Walter M. Will C. Wunderlich T. Yamamoto G. Chon C. D\'iaz M. Fiori M. Lobo G. Naletto M. Polo J.J. Rodr\'iguez-V\'azquez P. Saha L. Zampieri
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classification astro-ph.IM astro-ph.SR
keywords measurementsintensityopticalsystemtelescopesfirstiactsinterferometers
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In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar Intensity Interferometer), implemented to investigate the feasibility and potential of this technique on IACTs. After the first successful measurements in 2019, the system was upgraded and now features a real-time, dead-time-free, 4-channel, GPU-based correlator. These hardware modifications allow seamless transitions between MAGIC's standard very-high-energy gamma-ray observations and optical interferometry measurements within seconds. We establish the feasibility and potential of employing IACTs as competitive optical Intensity Interferometers with minimal hardware adjustments. The measurement of a total of 22 stellar diameters are reported, 9 corresponding to reference stars with previous comparable measurements, and 13 with no prior measurements. A prospective implementation involving telescopes from the forthcoming Cherenkov Telescope Array Observatory's northern hemisphere array, such as the first prototype of its Large-Sized Telescopes, LST-1, is technically viable. This integration would significantly enhance the sensitivity of the current system and broaden the UV-plane coverage. This advancement would enable the system to achieve competitive sensitivity with the current generation of long-baseline optical interferometers over blue wavelengths.

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