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X-ray intensity-hardness correlation and deep IR observations of the anomalous X-ray pulsar 1RXS J170849-400910 |
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| Authors: | N Rea G L Israel T Oosterbroek S Campana S Zane R Turolla V Testa M Méndez L Stella |
| Institution: | 1. SRON Netherlands Institute for Space Research, Sorbonnelaan, 2, 3584CA, Utrecht, The Netherlands 2. INAF—Astronomical Observatory of Rome, via Frascati 33, 00040, Monteporzio Catone (Rome), Italy 3. Science Payload and Advanced Concepts Office, ESA ESTEC, Postbus 299, 2200 AG, Noordwijk, The Netherlands 4. INAF—Astronomical Observatory of Brera, via Bianchi 46, 23807, Merate (Lc), Italy 5. Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking Surrey, RH5 6NT, UK 6. Physics Department, University of Padua, via Marzolo 8, 35131, Padova, Italy |
| Abstract: | We report here on X-ray and IR observations of the Anomalous X-ray Pulsar (AXP) 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. These new X-ray observations show that the AXP flux is rising again, and the spectrum hardening. If the increase of 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, as 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, and interpreted as a resonant scattering cyclotron feature. |
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