An artistic interpretation of the blazar phenomenon and the jet of high-energy particles it emits The study of BL Lac blazar is by an international team with Bulgarian participation An international team involving Bulgarian astronomers has detected cycles of oscillating brightness in a jet of high-energy particles emitted by the blazar BL Lac. The results of this research were published in one of the most prestigious scientific journals in the world - "Nature", no. 7926, Volume 609, 8 September 2022. Observations from 37 different telescopes in 13 countries were used to realize this study. Our results were obtained with the 2-m RCC telescope and the 50/70 cm Schmidt telescope at the National Astronomical Observatory Rozhen, as well as with the 60-cm telescope at the [...]

Study reveals in detail the quiet Sun at low frequencies Calibrated interferometric images of the quiet solar corona on 07.08.2021 in low frequencies (24.60-78.90 MHz) observed by LOFAR. The Sun is an active star that has significant radio emission over a wide frequency range from kHz to THz, and the solar atmosphere has a complex distribution of magnetic field, plasma density and temperature. These different properties of the solar atmosphere lead to different radio emission characteristics at different frequencies. Interferometric imaging observations of solar low-frequency emission can help diagnose the properties of the plasma at high altitudes in the solar atmosphere. Calibrated interferometric images of the quiet solar corona on 14.08.2021 at low frequencies (24.60-78.90 MHz) as observed by LOFAR. In [...]

Source: ЕSO, O. Hainaut The Institute of Astronomy with National Astronomical Observatory-BAS (IA with NAO) has named the results of the observations of comet 2I/Borisov, also known as C/2019 Q4 (Borisov), scientific achievement of 2021. They were conducted by an international team of scientists with the participation of IA researcher Assoc. Prof. Dr. Galin Borisov . Comet 2I/Borisov was discovered on 30 August 2019 by astronomer Gennady Borisov at the MARGO Observatory, Crimea, and is believed to be the most authentically preserved cosmic object - a sojourner in our solar system, second only to the asteroid 1I/'Oumuamua. The team of astronomers led by Dr. Stefano Bagnulo from the Armagh Observatory, Assoc. Borisov and their colleagues from France, Italy, Spain, the UK and the [...]