Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae

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dc.creatorBogdanov, Slavko
dc.creatorGrindlay, Jonathan E.
dc.creatorHeinke, Craig O.
dc.creatorCamilo, Fernando
dc.creatorFreire, Paulo C. C.
dc.creatorBecker, Werner
dc.date2006-04-13
dc.date.accessioned2026-07-07T11:25:29Z
dc.date.available2026-07-07T11:25:29Z
dc.descriptionWe present spectral and long-timescale variability analyses of \textit{Chandra} ACIS-S observations of the 19 millisecond pulsars (MSPs) with precisely known positions in the globular cluster 47 Tucanae. The X-ray emission of the majority of these MSPs is well described by a thermal (blackbody or neutron star hydrogen atmosphere) spectrum with a temperature $T_{\rm eff}\sim(1-3)\times10^6$ K, emission radius $R_{\rm eff}\sim0.1-3$ km, and luminosity $L_{X}\sim10^{30-31}$ ergs s$^{-1}$. For several MSPs, there is indication that a second thermal component is required, similar to what is seen in some nearby field MSPs. The radio-eclipsing binary MSPs 47 Tuc J, O, and W show a significant non-thermal component, with photon index $Γ\sim 1-1.5$, which may originate in an shock formed due to interaction between the relativistic pulsar wind and matter from the stellar companion. We re-examine the X-ray--spindown luminosity relation ($L_{X}-\dot{E}$) and find that due to the large uncertainties in both parameters the result is consistent with both the linear $L_{X}-\dot{E}$ relation and the flatter $L_X\propto\dot{E}^{0.5}$ predicted by polar cap heating models. In terms of X-ray properties, we find no clear systematic differences between MSPs in globular clusters and in the field of the Galaxy.
dc.description13 pages, 6 figures, accepted for publication in the Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0604318
dc.identifierhttp://arxiv.org/abs/astro-ph/0604318
dc.identifierAstrophys.J.646:1104-1115,2006
dc.identifierdoi:10.1086/505133
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195524
dc.subjectAstrophysics
dc.titleChandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae
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