English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present spectral and long-timescale variability analyses of\textit{Chandra} ACIS-S observations of the 19 millisecond pulsars (MSPs) withprecisely known positions in the globular cluster 47 Tucanae. The X-rayemission 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 isindication that a second thermal component is required, similar to what is seenin some nearby field MSPs. The radio-eclipsing binary MSPs 47 Tuc J, O, and Wshow a significant non-thermal component, with photon index $\Gamma\sim 1-1.5$,which may originate in an shock formed due to interaction between therelativistic pulsar wind and matter from the stellar companion. We re-examinethe X-ray--spindown luminosity relation ($L_{X}-\dot{E}$) and find that due tothe large uncertainties in both parameters the result is consistent with boththe 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 noclear systematic differences between MSPs in globular clusters and in the fieldof the Galaxy.Comment: 13 pages, 6 figures, accepted for publication in the Astrophysical  Journa

ChandraX‐Ray Observations of 19 Millisecond Pulsars in the Globular Cluster 47 Tucanae