Progenitor constraint with circumstellar material for the magnetar-hosting supernova remnant RCW 103

Abstract

Stellar winds blown out from massive stars ($\gtrsim 10M_{\odot }$) contain precious information on the progenitor itself, and in this context, the most important elements are carbon (C), nitrogen (N), and oxygen (O), which are produced by the CNO cycle in the H-burning layer. Although their X-ray fluorescence lines are expected to be detected in swept-up shock-heated circumstellar materials (CSMs) in supernova remnants (SNRs), particularly those of C and N have been difficult to detect so far. Here, we present a high-resolution spectroscopy of a young magnetar-hosting SNR RCW~103 with the Reflection Grating Spectrometer (RGS) onboard XMM-Newton and report on the detection of \ion{N}{7} Ly$\alpha$ (0.50~keV) line for the first time. By comparing the obtained abundance ratio of N to O (N/O$=3.8\pm 0.1$) with various stellar evolution models, we show that the progenitor of RCW~103 is likely to have a low-mass (10--12~$M_{\odot }$) and medium-rotation velocities ($\lesssim 100\mathrm{km}{\mathrm{s}}^{-1}$). The results also rule out the possibility of dynamo effects in massive ($\ge 35M_{\odot }$) stars as a formation mechanism of the associated magnetar 1E~161348$-$5055. Our method is useful for estimating various progenitor parameters for future missions with microcalorimeters such as XRISM and Athena.

arXiv commentAccepted for publication in ApJ. 11 pages, 8 figures

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