Correlation Study of Temporal and Emission Properties of Quiescent Magnetars

• Published in: 천문학회지 Vol. 56; no. 1; pp. 41 - 57
• Main Authors: Jiwoo Seo, Jaewon Lee, Hongjun An
• Format: Journal Article
• Language: English
• Published: 한국천문학회 2023
• Subjects: stars: neutron— stars: statistics— pulsars: general— X-rays
• ISSN: 1225-4614; 2288-890X
• DOI: 10.5303/JKAS.2023.56.1.41

We measured temporal and emission properties of quiescent magnetars using archival Chandra and XMM-Newton data, produced a list of the properties for 17 magnetars, and revisited previously suggested correlations between the properties. Our studies carried out with a larger sample, better spectral characterizations, and more thorough analyses not only confirmed previously-suggested correlations but also found new ones. The observed correlations differ from those seen in other neutron-star populations but generally accord with magnetar models. Specifically, the trends of the intriguing correlations of blackbody luminosity (𝐿BB) with the spin-inferred dipole magnetic field strength (𝐵S) and characteristic age (𝜏c) were measured to be 𝐿BB ∝ 𝐵1.5 S and 𝐿BB ∝ 𝜏−0.6 c , supporting the twisted magnetosphere and magnetothermal evolution models for magnetars. We report the analysis results and discuss our findings in the context of magnetar models.