Abstract
XMMSL1 J171900.4–353217 is a very-faint X-ray transient that was discovered in 2010 March when it exhibited an outburst. We report on 7 observations, obtained with the X-Ray Telescope (XRT) aboard the Neil Gehrels Swift Observatory between 2010 May and October. By fitting a single absorbed power-law model to the XRT spectra, we infer power-law indices of Γ = 1.8 &minus 2.7 and an absorption column density of NH = (4.6‑7.9)×1022 cm‑2. The inferred 0.5‑10 keV luminosity fluctuated irregularly and peaked at LX ≃ 1035 ‑ 1036 erg s‑1 for a distance of 4 ‑ 12 kpc. Based on the evolution of the power-law index with varying luminosity, we propose that the source most likely is a transient neutron star low-mass X-ray binary located at several kpc. If true, it would be a good candidate to search for coherent millisecond pulsations when it enters a new accretion outburst.Resumen
XMMSL1 J171900.4-353217 es una binaria de rayos-X transitoria poco lumi- nosa descubierta en marzo de 2010 durante una erupción. Presentamos 7 observa- ciones obtenidas entre mayo y octubre de 2010 con el Telescopio de Rayos-X (XRT) a bordo del Observatorio Neil Gehrels Swift. Mediante el ajuste de los espectros del XRT con un modelo de ley de potencias absorbido, obtenemos uníndice fotónico de Γ=1.8−2.7 y una densidad de la columna de hidrógeno de NH=(4.6−7.9)×1022cm−2. La luminosidad, en el intervalo 0.5 −10 keV, fluctuó irregularmente, con picos de LX ≈1035 −1036 erg s−1 para una distancia de 4−12 kpc. Basándonos en la evolución delíndice fotónico con la luminosidad, proponemos que la fuente es probablemente una binaria de rayos-X poco masiva con una estrella de neutrones situada a varios kpc. De ser cierto, esta fuente sería una buena candidata para buscar pulsaciones coherentes de milisegundos cuando entre de nuevo en erupción.References
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