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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present results of a follow-up search for continuous gravitational waves(CWs) associated with sub-threshold candidates from the LIGO-Virgo-KAGRA (LVK)All-Sky All-Frequency (ASAF) directed radiometer analysis, using Advanced LIGOdata from the third observing run (O3). Each ASAF candidate corresponds to a$1/32\,\,\mathrm{Hz}$ frequency band and ${\sim}13\,\,\mathrm{deg}^2$ skypixel. Assuming they represent possible CW sources, we analyze all $515$ ASAFcandidates using a semi-coherent, $\mathcal{F}$-statistic-based matched filtersearch. The search algorithm incorporates a hidden Markov model (HMM),expanding the signal model to allow frequency spin-wandering, as well asunmodeled frequency evolution of less than $10^{-5}$ Hz per day that is notcaptured by the searched range of $\pm10^{-9}\,\,\mathrm{Hz/s}$ in frequencyderivative. Significance thresholds with a $5\%$ probability of false alarm perASAF candidate are determined empirically by searching detector noise atvarious off-target sky positions. We obtain $14$ outliers surviving a set ofvetoes designed to eliminate instrumental artifacts. Upon furtherinvestigation, these outliers are deemed unlikely to represent astrophysicalsignals. We estimate the sensitivity of our search to both isolated and binarysources with orbital period greater than one year by recovering simulatedsignals added to detector data. The minimum detectable strain amplitude at$95\%$ confidence for isolated (long-period binary) sources is $h_0^{95\%} =8.8\times 10^{-26}$ ($9.4\times 10^{-26}$) at a frequency of$222.6\,\,\mathrm{Hz}$. While this study focuses on ASAF sub-thresholdcandidates, the method presented could be applied to follow up candidates fromfuture all-sky CW searches, complementing currently existing methods.

Search for continuous gravitational waves directed at sub-threshold radiometer candidates in O3 LIGO data