Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-23
Astrophys.J.663:497-504,2007
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ. Major changes with respect to submitted (v1) version: includes an additional 4 months of timi
Scientific paper
10.1086/518226
We report on 9 months of observations of the radio-emitting anomalous X-ray pulsar XTE J1810-197 starting in 2006 May using the Nancay, Parkes, GBT, 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 GBT 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.
Backer Donald C.
Camilo Fernando
Cognard Ismaël
Demorest Paul
Gotthelf Eric Van
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