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

One of the central goals of LISA is the detection of gravitational waves fromthe merger of supermassive black holes. Contrary to stellar-mass black holemergers, such events are expected to be rich X-ray sources due to the accretionof material from the circumbinary disks onto the black holes. The orbitaldynamics before merger is also expected to modulate the resulting X-rayemission via Doppler boosting in a quasi-periodic way, and in a simple phaserelation with the gravitational wave from the inspiral of the black holes.Detecting the X-ray source would enable a precise and early localization of thebinary, thus allowing many telescopes to observe the very moment of the merger.Although identifying the correct X-ray source in the relatively large LISA skylocalization will be challenging due to the presence of many confounding pointsources, the quasi-periodic modulation may aid in the identification. Weexplore the practical feasibility of such idea. We simulate populations ofmerging supermassive black holes, their detection with LISA and their X-raylightcurves using a simple model. Taking the parameters of the X-ray Telescopeon the proposed NASA Transient Astrophysics Probe, we then design and simulatean observation campaign that searches for the modulated X-ray source while LISAis still observing the inspiral of the black holes. Assuming a fiducial LISAdetection rate of $10$ mergers per year at redshift closer than $3.5$, weexpect a few detections of modulated X-ray counterparts over the nominalduration of the LISA mission.

Detectability of modulated X-rays from LISA's supermassive black hole mergers