NuSTAR rules out a cyclotron line in the accreting magnetar candidate 4U2206+54

Abstract

Based on our new NuSTAR X-ray telescope data, we rule out any cyclotron line up to 60 keV in the spectra of the high mass X-ray binary 4U2206+54. In particular, we do not find any evidence of the previously claimed line around 30 keV, independently of the source flux, along the spin pulse. The spin period has increased significantly, since the last observation, up to $5750\pm 10$ s, confirming the rapid spin down rate $\dot{\nu }=-1.8\times 10^{-14}$~Hz s${}^{-1}$. This behaviour might be explained by the presence of a strongly magnetized neutron star ($B_{\mathrm{s}}>$ several times $10^{13}$ G) accreting from the slow wind of its main sequence O9.5 companion.

arXiv commentAccepted for publication in MNRAS, Main Journal

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• Cyclotron lines in highly magnetized neutron stars
• Evidence for an abundant old population of Galactic ultra long period magnetars and implications for fast radio bursts
• The stellar and wind parameters of six prototypical HMXBs and their evolutionary status
• Understanding the coexistence of spin-up and spin-down behaviors in long period X-ray pulsars
• The origin of the high-mass X-ray binary 4U 2206+54/BD +53 2790
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• The role of XMM-Newton in the investigation of persistent BeXRBs
• Monte-Carlo simulations on possible collimation effects of outflows to fan-beamed emission of ultraluminous accreting X-ray pulsars