Multi-wavelength observations of 1RXH J173523.7-354013: revealing an unusual bursting neutron star

N. Degenaar; P. G. Jonker; M. A. P. Torres; R. Kaur; N. Rea; G. L. Israel; A. Patruno; G. Trap; E. M. Cackett; P. D'Avanzo; G. Lo Curto; G. Novara; H. Krimm; S. T. Holland; A. De Luca; P. Esposito; R. Wijnands

doi:10.1111/j.1365-2966.2010.16388.x

arXiv · 1001.3688

Multi-wavelength observations of 1RXH J173523.7-354013: revealing an unusual bursting neutron star

N. Degenaar·P. G. Jonker·M. A. P. Torres·R. Kaur·N. Rea·G. L. Israel·A. Patruno·G. Trap·E. M. Cackett·P. D'Avanzo·G. Lo Curto·G. Novara·H. Krimm·S. T. Holland·A. De Luca·P. Esposito·R. Wijnands

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Abstract

On 2008 May 14, the Burst Alert Telescope aboard the Swift mission triggered on a type-I X-ray burst from the previously unclassified ROSAT object 1RXH J173523.7-354013, establishing the source as a neutron star X-ray binary. We report on X-ray, optical and near-infrared observations of this system. The X-ray burst had a duration of ~2 h and belongs to the class of rare, intermediately long type-I X-ray bursts. From the bolometric peak flux of ~3.5E-8 erg/cm^2/s, we infer a source distance of D<9.5 kpc. Photometry of the field reveals an optical counterpart that declined from R=15.9 during the X-ray burst to R=18.9 thereafter. Analysis of post-burst Swift/XRT observations, as well as archival XMM-Newton and ROSAT data suggests that the system is persistent at a 0.5-10 keV luminosity of ~2E35 (D/9.5 kpc)^2 erg/s. Optical and infrared photometry together with the detection of a narrow Halpha emission line (FWHM=292+/-9 km/s, EW=-9.0+/-0.4 Angstrom) in the optical spectrum confirms that 1RXH J173523.7-354013 is a neutron star low-mass X-ray binary. The Halpha emission demonstrates that the donor star is hydrogen-rich, which effectively rules out that this system is an ultra-compact X-ray binary.

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N. Degenaar, P. G. Jonker, M. A. P. Torres, R. Kaur, N. Rea, G. L. Israel, A. Patruno, G. Trap, E. M. Cackett, P. D'Avanzo, G. Lo Curto, G. Novara, H. Krimm, S. T. Holland, A. De Luca, P. Esposito, R. Wijnands. 2010-01-20. Multi-wavelength observations of 1RXH J173523.7-354013: revealing an unusual bursting neutron star. https://doi.org/10.1111/j.1365-2966.2010.16388.x

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