Constraining the nature of the 18-min periodic radio transient GLEAM-X J162759.5-523504.3 via multi-wavelength observations and magneto-thermal simulations

N. Rea, F. Coti Zelati, C. Dehman, Natasha Hurley-Walker, D. De Martino, A. Bahramian, D. A. H. Buckley, J. Brink, A. Kawka, J. A. Pons, D. Vigano, V. Graber, M. Ronchi, C. Pardo, A. Borghese, E. Parent

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Abstract

We observed the periodic radio transient GLEAM-X J162759.5-523504.3 (GLEAM-X J1627) using the Chandra X-ray Observatory for about 30-ks on January 22-23, 2022, simultaneously with radio observations from MWA, MeerKAT and ATCA. Its radio emission and 18-min periodicity led the source to be tentatively interpreted as an extreme magnetar or a peculiar highly magnetic white dwarf. The source was not detected in the 0.3-8 keV energy range with a 3-sigma upper-limit on the count rate of 3x10^{-4} counts/s. No radio emission was detected during our X-ray observations either. Furthermore, we studied the field around GLEAM-X J1627 using archival ESO and DECam data, as well as recent SALT observations. Many sources are present close to the position of GLEAM-X J1627, but only two within the 2" radio position uncertainty. Depending on the assumed spectral distribution, the upper limits converted to an X-ray luminosity of L_{X}10.000 K), while a cold isolated white dwarf is still compatible with our limits.
Original languageEnglish
JournalThe Astrophysical Journal
DOIs
Publication statusPublished - 22 Nov 2022

Keywords

  • astro-ph.HE

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