Astronomy and Astrophysics, volume 629A, 51-51 (2019/9-1)
Spatially resolved X-ray study of supernova remnants that host magnetars: Implication of their fossil field origin.
ZHOU P., VINK J., SAFI-HARB S. and MICELI M.
Abstract (from CDS):
Magnetars are regarded as the most magnetized neutron stars in the Universe. Aiming to unveil what kinds of stars and supernovae can create magnetars, we have performed a state-of-the-art spatially resolved spectroscopic X-ray study of the supernova remnants (SNRs) Kes 73, RCW 103, and N49, which host magnetars 1E 1841-045, 1E 161348-5055, and SGR 0526-66, respectively. The three SNRs are O- and Ne-enhanced and are evolving in the interstellar medium with densities of >1-2cm–3. The metal composition and dense environment indicate that the progenitor stars are not very massive. The progenitor masses of the three magnetars are constrained to be <20M☉ (11-15M☉ for Kes 73, ≤13M☉ for RCW 103, and ∼13-17M☉ for N49). Our study suggests that magnetars are not necessarily made from very massive stars, but originate from stars that span a large mass range. The explosion energies of the three SNRs range from 1050erg to ∼2x1051erg, further refuting that the SNRs are energized by rapidly rotating (millisecond) pulsars. We report that RCW 103 is produced by a weak supernova explosion with significant fallback, as such an explosion explains the low explosion energy (∼1050erg), small observed metal masses (MO∼4x10–2M☉ and MNe∼6 x10–3M☉), and sub-solar abundances of heavier elements such as Si and S. Our study supports the fossil field origin as an important channel to produce magnetars, given the normal mass range (MZAMS<20M☉) of the progenitor stars, the low-to-normal explosion energy of the SNRs, and the fact that the fraction of SNRs hosting magnetars is consistent with the magnetic OB stars with high fields.
© ESO 2019
ISM: supernova remnants - nuclear reactions, nucleosynthesis, abundances - stars: magnetars - pulsars: general
HB9 not identified.
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