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

Millisecond pulsars (MSPs) and normal non-recycled pulsars are both detectedin $\gamma$-rays. However, it appears that a much larger fraction of knownenergetic and nearby MSPs are detected in $\gamma$-rays, in comparison withnormal pulsars, thereby making undetected $\gamma$-ray MSPs exceptions. In thispaper, we demonstrate that the viewing angles (i.e. between the pulsar spinaxis and the line of sight) are well described by the orbital inclinationangles which, for binary MSPs with helium white dwarf companions, can bedetermined using the relationship between the orbital period and the whitedwarf mass. We use the predicted viewing angles, in complement with valuesobtained from other constraints when available, to identify the causes ofnon-detection of energetic and nearby MSPs from the point of view of beaminggeometry and orientation. We find evidence for slightly different viewing angledistributions, and postulate that energetic and nearby MSPs are mainlyundetected in $\gamma$-rays simply because they are seen under unfavourable(i.e. small) viewing angles. We finally discuss the magnetic fields of$\gamma$-ray detected pulsars and show that pulsars which are efficient atconverting their rotational energy into $\gamma$-ray emission may haveoverestimated dipolar magnetic field strengths.

On the non-detection of gamma-rays from energetic millisecond pulsars -- dependence on viewing geometry