Spectral-temporal features of repeating ( one-off ) FRBs and Axion Star

Abstract

The fast radio bursts ( FRBs ) are energetic radio bursts with millisecond duration only observed at radio frequencies. The generation mechanism is still mysterious. We have proposed a generation mechanism of both repeating and one-off FRBs. They arise from the axion star collision with neutron star or magnetized accretion disk of galactic black hole. Once we accept the existence of the axions, we find that the mechanism well explain previously observed spectral-temporal features. In this paper we show that it also explains recently observed phenomena such as downward drifting in the repeating FRBs, etc.. Analysis of the downward drifting based on Doppler effects has been presented in recent papers, in which a superradiance system of molecular or atom has been proposed as a source of FRBs. We apply the analysis to our mechanism and find that it well explains the relation between the downward drifting rate and the duration of the repeating FRBs. The Doppler effects lead to the fact that the duration of radio burst with higher center frequency is shorter than that of radio burst with lower center frequency in the repeating FRBs. Our generation mechanism naturally explain polarization angle swing observed in the repeating FRB180301 and one-off FRBs. We also discuss the association between the FRB200428 and magnetar SGR J1935+2154. The X ray burst observed just after the observation of the FRB could be triggered by the axion star collision with the magnetar. We also explain the consistency of our generation mechanism with observed spectral-temporal differences in the repeating and one-off FRBs, e.g. longer duration ( smaller flux density ) of repeating FRBs than duration ( flux density ) of one-off FRBs.

15 Pages, no figure, To be published in Phys. Rev. D

References in corpus (20)

• A bright millisecond radio burst of extragalactic origin
• Fast Radio Bursts
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• Nine New Repeating Fast Radio Burst Sources from CHIME/FRB
• A Multi-telescope Campaign on FRB 121102: Implications for the FRB Population
• Diverse polarization angle swings from a repeating fast radio burst source
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• The host galaxies and progenitors of Fast Radio Bursts localized with the Australian Square Kilometre Array Pathfinder
• A sample of low energy bursts from FRB 121102
• Fast Radio Bursts and Axion Miniclusters
• On the Time-Frequency Downward Drifting of Repeating Fast Radio Bursts
• Axion Stars and Fast Radio Bursts
• Fast Radio Bursts from Interacting Binary Neutron Star Systems
• No redshift evolution of non-repeating fast radio-burst rates
• Magnetically elevated accretion disks in active galactic nuclei: broad emission line regions and associated star formation
• A simple relationship for the spectro-temporal structure of bursts from FRB 121102
• "Slow" Radio Bursts from Galactic Magnetars?
• Re-Analysis of Breakthrough Listen Observations of FRB 121102: Polarization Properties of Eight New Spectrally Narrow Bursts

Cited by in corpus (4)

• The Physics of Fast Radio Bursts
• Long and Short Fast Radio Bursts are Different from Repeating and Non-repeating Transients
• Memory in the Burst Occurrence of Repeating FRBs
• Radiation Burst by Axion Star Collision with Star in the Andromeda Galaxy