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Information × Registration Number 0225U000506, (0123U103014) , R & D reports Title Study of the inside and outside medium properties of the Cassiopeia A supernova remnant by using radio interferometers popup.stage_title Спостереження випромінювання Кассіопеї А і Лебедя А у режимі транзиту джерел через діаграму спрямованості інтерферометрів із субрешіток ГУРТ, УРАН за рахунок добового обертання Землі. Розробка алгоритмів програмного забезпечення для обробки даних, отриманих на радіоінтерферометрах ГУРТ, УРАН. Обробка даних, отриманих на радіоінтерферометрах ГУРТ, УРАН. Визначення характеристик зареєстрованих на радіоінтерферометрах ГУРТ, УРАН радіоспектрів Кассіопеї А та дослідження характеристик середовища всередині та зовні залишку. Head Stanyslavskyi Lev O., Доктор філософії Registration Date 13-01-2025 Organization Radio Astronomical Institute of the National Academy of Sciences of Ukraine popup.description1 The aim of this work is a study of the supernova remnant Cassiopeia A, located in our Galaxy, by observing the low-frequency radiation produced by the acceleration of charged particles after the star’s explosion. popup.description2 The second cycle of experimental studies of Cassiopeia and Leo A radio emission was carried out using the GURT, URAN-2 and NenuFAR radio telescopes. The radiation patterns of the GURT, URAN-2 and NenuFAR antenna arrays were installed in the zenith position to study the radiation from Cassiopeia A and Cygnus A in the transit mode of these sources. As part of the work, the software for processing and analyzing the data obtained from the three radio telescopes was improved. Based on the new data sets from each radio telescope obtained during 2024, integrated radio spectra were constructed, the properties of the environment inside and outside the remnant were determined, and the flux density ratio of Cassiopeia A to Cygnus A for 2024 was obtained. A comparative analysis of the radio spectra of Cassiopeia A obtained from each radio telescope in 2024 was carried out. The presence of a direct dependence of the measured radio spectra on the thermal absorption inside and outside the remnant was established. The maximum of the spectrum of the Cassiopeia A supernova remnant was found and its frequency shift between 2019 and 2024 was investigated. Based on the results of processing and analyzing the observational data, it is confirmed that the measured values of the parameters of the thermal absorption regions of Cassiopeia A are in good agreement with other recently published results in such works (Arias et al. 2018; Stanislavsky et al. 2023). The experimental results are useful because they confirm the previous results in a completely independent way using a completely new combination of instruments that provided an extension of the frequency range of Cassiopeia A and Swan A observations that was not available in previous studies with the GURT radio telescope. Product Description popup.authors Vasylkivskyi Yevhen V. Stanyslavskyi Lev O. popup.nrat_date 2025-01-13 Close