The quasi-persistent neutron star soft X-ray transient 1M 1716-315 in quiescence

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dc.creatorJonker, P. G.
dc.creatorBassa, C. G.
dc.creatorWachter, S.
dc.date2007-03-01
dc.date.accessioned2026-07-07T11:00:57Z
dc.date.available2026-07-07T11:00:57Z
dc.descriptionWe report on our analysis of a 20 ksec Chandra X-ray observation of the quasi-persistent neutron star soft X-ray transient (SXT) 1M1716-315 in quiescence. Only one source was detected in the HEAO-I error region. Its luminosity is 1.6E32-1.3E33 erg s-1. In this the range is dominated by the uncertainty in the source distance. The source spectrum is well described by an absorbed soft spectrum, e.g. a neutron star atmosphere or black body model. No optical or near-infrared counterpart is present at the location of the X-ray source, down to a magnitude limit of I> 23.5 and K_s> 19.5. The positional evidence, the soft X-ray spectrum together with the optical and near-infrared non-detections provide strong evidence that this source is the quiescent neutron star SXT. The source is 10-100 times too bright in X-rays in order to be explained by stellar coronal X-ray emission. Together with the interstellar extinction measured in outburst and estimates for the source distance, the reported optical and near-infrared limit give an upper limit on the absolute magnitude of the counterpart of I>8.6 and K_s>5.1. This implies that the system is either an ultra-compact X-ray binary having P_orb<1 hr or the companion star is an M-dwarf. We reconstructed the long term X-ray lightcurve of the source. 1M1716-315 has been active for more than 12 years before returning to quiescence, the reported Chandra observation started 16.9+-4.1 years after the outburst ended.
dc.description7 pages, 4 figures, accepted to MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0703020
dc.identifierhttp://arxiv.org/abs/astro-ph/0703020
dc.identifierMon.Not.Roy.Astron.Soc.377:1295-1300,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.11689.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187819
dc.subjectAstrophysics
dc.titleThe quasi-persistent neutron star soft X-ray transient 1M 1716-315 in quiescence
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