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

Using new and archival observations made with the Swift satellite and otherfacilities, we examine 147 X-ray sources selected from the ROSAT All-Sky-SurveyBright Source Catalog (RASS/BSC) to produce a new limit on the number ofisolated neutron stars (INSs) in the RASS/BSC, the most constraining such limitto-date. Independent of X-ray spectrum and variability, the number of INSs is<=48 (90% confidence). Restricting attention to soft (having an effectivetemperature of < 200 eV), non-variable X-ray sources -- as in a previous study-- yields an all-sky limit of <=31 INSs. In the course of our analysis, weidentify five new high-quality INS candidates for targeted follow-upobservations. A future all-sky X-ray survey with eROSITA, or another missionwith similar capabilities, can be expected to increase the detected populationof X-ray-discovered INSs from the 8 to 50 in the BSC, to (for a diskpopulation) 240 to 1500, which will enable a more detailed study of neutronstar population models.

A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT All-Sky Survey Bright Source Catalog