University of Cagliari
open
Alessandra Fanni
A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82
El Byad, Hamza;Bachetti, Matteo;Columbu, Silvia;Rodriguez, Giuseppe;Pilia, Maura;Lai, Eleonora Veronica;
2025-01-01
Abstract
The study of quasiperiodic oscillations (QPOs) in X-ray binaries provides valuable insights into the physics of accretion around compact objects. The M82 galaxy hosts multiple ultraluminous X-ray sources, including two prominent ones—X-1 and X-2—where X-1 is suspected to harbor an intermediate-mass black hole. In this work, we analyze data from 39 NuSTAR observations acquired between 2014 and 2024 to investigate the aperiodic X-ray variability in M82. In particular, we study in detail the evolution of the QPOs from M82 X-1 in the range 20–300 mHz. We do not find additional timing features in the data, besides a frequently present broad noise component at lower frequencies. The QPO behaves similarly to other classes of low-frequency oscillations in accreting compact objects, both black holes and neutron stars.
Files in This Item:
| File | Size | Format | |
|---|---|---|---|
| M82_25.pdf open access
Type: versione editoriale
Size 2.25 MB
Format Adobe PDF
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2.25 MB | Adobe PDF | View/Open |
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