Intensity-hardness correlation and deep infrared observation of the anomalous X-ray pulsar 1RXS J170849-400910

Details Intensity-hardness correlation and deep infrared observation of the anomalous X-ray pulsar 1RXS J170849-400910 Intensity-hardness correlation and deep infrared observation of the anomalous X-ray pulsar 1RXS J170849-400910

2006-10-19

arxiv.org/abs/astro-ph/0610594v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 color figures; Astrophysics & Space Science, in press ("Isolated Neutron Stars"; London, UK)

Scientific paper

10.1007/s10509-007-9310-5

We report here on X-ray and IR observations of the Anomalous X-ray Pulsar 1RXS J170849-400910. First, we report on new XMM-Newton, Swift-XRT and Chandra observations of this AXP, which confirm the intensity-hardness correlation observed in the long term X-ray monitoring of this source by Rea et al. (2005). These new X-ray observations show that the AXP flux is rising again, and the spectrum hardening. If the increase in the source intensity is indeed connected with the glitches and a possible bursting activity, we expect this source to enter in a bursting active phase around 2006-2007. Second, we report on deep IR observations of 1RXS J170849-400910, taken with the VLT-NACO adaptive optics, showing that there are many weak sources consistent with the AXP position. Neither star A or B, previously proposed by different authors, might yet be conclusively recognised as the IR counterpart of 1RXS J170849-400910. Third, using Monte Carlo simulations, we re-address the calculation of the significance of the absorption line found in a phase-resolved spectrum of this source by Rea et al. (2003), and interpreted as a resonant scattering cyclotron feature.

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