Details

Autor(en) / Beteiligte

• Castro-Tirado, A J
• Østgaard, N
• Göǧüş, E
• Sánchez-Gil, C
• Pascual-Granado, J
• Reglero, V
• Mezentsev, A
• Gabler, M
• Marisaldi, M
• Neubert, T
• Budtz-Jørgensen, C
• Lindanger, A
• Sarria, D
• Kuvvetli, I
• Cerdá-Durán, P
• Navarro-González, J
• Font, J A
• Zhang, B-B
• Lund, N
• Oxborrow, C A
• Brandt, S
• Caballero-García, M D
• Carrasco-García, I M
• Castellón, A
• Castro Tirado, M A
• Christiansen, F
• Eyles, C J
• Fernández-García, E
• Genov, G
• Guziy, S
• Hu, Y-D
• Nicuesa Guelbenzu, A
• Pandey, S B
• Peng, Z-K
• Pérez Del Pulgar, C
• Reina Terol, A J
• Rodríguez, E
• Sánchez-Ramírez, R
• Sun, T
• Ullaland, K
• Yang, S

Titel

Very-high-frequency oscillations in the main peak of a magnetar giant flare

Ist Teil von

• Nature (London), 2021-12, Vol.600 (7890), p.621-624

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2021

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• Magnetars are strongly magnetized, isolated neutron stars with magnetic fields up to around 10  gauss, luminosities of approximately 10 -10  ergs per second and rotation periods of about 0.3-12.0 s. Very energetic giant flares from galactic magnetars (peak luminosities of 10 -10  ergs per second, lasting approximately 0.1 s) have been detected in hard X-rays and soft γ-rays , and only one has been detected from outside our galaxy . During such giant flares, quasi-periodic oscillations (QPOs) with low (less than 150 hertz) and high (greater than 500 hertz) frequencies have been observed , but their statistical significance has been questioned . High-frequency QPOs have been seen only during the tail phase of the flare . Here we report the observation of two broad QPOs at approximately 2,132 hertz and 4,250 hertz in the main peak of a giant γ-ray flare in the direction of the NGC 253 galaxy , disappearing after 3.5 milliseconds. The flare was detected on 15 April 2020 by the Atmosphere-Space Interactions Monitor instrument aboard the International Space Station, which was the only instrument that recorded the main burst phase (0.8-3.2 milliseconds) in the full energy range (50 × 10 to 40 × 10  electronvolts) without suffering from saturation effects such as deadtime and pile-up. Along with sudden spectral variations, these extremely high-frequency oscillations in the burst peak are a crucial component that will aid our understanding of magnetar giant flares.