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The Magnetar XTE J1810−197: Variations in Torque, Radio Flux Density, and Pulse Profile Morphology

Abstract : We report on 9 months of observations of the radio-emitting anomalous X-ray pulsar XTE J1810 - 197 starting in 2006 May using the Nanc, ay, Parkes, Green Bank Telescope, and VLA telescopes mainly at a frequency of 1.4 GHz. The torque experienced by the neutron star during this period, as inferred from a measurement of its rotational frequency derivative, decreased by 60%, although not in a steady manner. We have also observed very large ongoing fluctuations in flux density and pulse shape. Superimposed on these, a general diminution of flux density and a broadening of the pulse profile components occurred nearly contemporaneously with a decrease in torque of about 10% that took place in late 2006 July over an interval of 2 weeks. After a slight increase in average flux density, since 2006 October the flux density has continued to decline and the pulse profiles, while still varying, appear more uniform. In addition, a simultaneous observation of the pulsar with the Chandra X-ray Observatory and the Green Bank Telescope allows us to show how the X-ray and radio profiles are aligned. We discuss briefly the implications of these results for the magnetospheric currents in this remarkable object.
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F. Camilo, Ismaël Cognard, S.M. Ransom, J.P. Halpern, J. Reynolds, et al.. The Magnetar XTE J1810−197: Variations in Torque, Radio Flux Density, and Pulse Profile Morphology. The Astrophysical Journal, American Astronomical Society, 2007, 663 (1), pp.497-504. ⟨10.1086/518226⟩. ⟨insu-02778358⟩

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