Affiliation:
1. Institute of Astronomy, National Tsing Hua University, Hisnchu City 300044, Taiwan
2. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China
Abstract
ABSTRACT
We investigated the radio spectra of two magnetars, PSR J1622 − 4950 and 1E 1547.0 − 5408, using observations from the Australia Telescope Compact Array and the Atacama Large Millimeter/submillimeter Array obtained in 2017. Our observations of PSR J1622 − 4950 show a steep spectrum with a spectral index of −1.3 ± 0.2 in the range of 5.5–45 GHz during its reactivating X-ray outburst in 2017. By comparing the data taken in different epochs, we found a significant enhancement in the radio flux density. The spectrum of 1E 1547.0 − 5408 was inverted in the range of 43–95 GHz, suggesting a spectral peak at a few hundred gigahertz. Moreover, we obtained X-ray and radio data of the radio magnetars PSR J1622 − 4950 and SGR J1745 − 2900 from the literature and found two interesting properties. First, radio emission is known to be associated with X-ray outbursts but has a different evolution; furthermore, we found that the rise time of the radio emission is much longer than that of the X-ray emission during the outburst. Second, radio magnetars may have double-peak spectra at a few GHz and a few hundred GHz. This could indicate that the emission mechanism is different in the cm and the submm bands. These two phenomena could provide a hint towards an understanding of the origin of radio emission and its connection with X-ray properties.
Funder
European Southern Observatory
National Science Foundation
National Institutes of Natural Sciences
National Research Council Canada
Ministry of Science and Technology
Korea Astronomy and Space Science Institute
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
10 articles.
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