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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A number of low-mass millisecond pulsar (MSP) binaries in theirrotation-powered state exhibit double-peaked X-ray orbital modulation centeredat inferior pulsar conjunction. This state, which has been known to persist foryears, has recently been interpreted as emission from a shock that enshroudsthe pulsar. However, the pressure balance for such a configuration is a crucialunresolved issue. We consider two scenarios for pressure balance: a companionmagnetosphere and stellar mass loss with gas dominance. It is found that themagnetospheric scenario requires several kilogauss poloidal fields for isobaricsurfaces to enshroud the MSP as well as for the magnetosphere to remain stableif there is significant mass loss. For the gas-dominated scenario, it isnecessary that the companion wind loses angular momentum prolifically as anadvection or heating-dominated flow. Thermal bremsstrahlung cooling in the flowmay be observable as a UV to soft X-ray component independent of orbital phaseif the mass rate is high. We formulate the general requirements for shockstability against gravitational influences in the pulsar rotation-powered statefor the gas-dominated scenario. We explore stabilizing mechanisms, principallyirradiation feedback, which anticipates correlated shock emission and companionvariability and predicts $ F_\gamma/F_{\rm X} \lesssim 14$ for the ratio ofpulsar magnetospheric $\gamma$-ray to total shock soft-to-hard X-ray fluxes.This stability criterion implies an unbroken extension of X-ray power-lawemission to hundreds of keV for some systems. We explore observationaldiscriminants between the gas-dominated and magnetospheric scenarios,motivating contemporaneous radio through $\gamma$-ray monitoring of thesesystems.

Pressure Balance and Intrabinary Shock Stability in Rotation-Powered State Redback and Transitional Millisecond Pulsar Binary Systems