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 observations of two strong-lensing galaxy clusters located withinthe $90$ per cent credible sky localization maps released followingLIGO-Virgo's discovery of the binary black hole (BH-BH) gravitational wave (GW)source GW170814. Our objectives were (1) to search for candidateelectromagnetic (EM) counterparts to GW170814 under the hypothesis that it wasstrongly-lensed, and thus more distant and less massive than inferred byLIGO-Virgo, and (2) to demonstrate the feasibility of rapid target ofopportunity observations to search for faint lensed transient point sources incrowded cluster cores located within GW sky localizations. Commencing $20$hours after discovery, and continuing over $12$ nights, we observed Abell 3084($z=0.22$) and SMACSJ0304.3$-$4401 ($z=0.46$) with GMOS on the Gemini-Southtelescope, and Abell 3084 with MUSE on ESO's Very Large Telescope. We detect nocandidate EM counterparts in these data. Calibration of our photometricanalysis methods using simulations yield $5\sigma$ detection limits fortransients in difference images of the cores of these clusters of $i=25$. Thisis the most sensitive photometric search to date for counterparts to GWsources, and rules out the possibility that GW170814 was lensed by theseclusters with a kilonova-like EM counterpart. Based on the detector framemasses of the compact objects, and assuming that at least one Neutron Star (NS)is required in the merging system to produce a kilonova-like counterpart,implies that GW170814 was neither a NS-NS nor NS-BH merger at $z>8$ lensed byeither of these clusters. Also, in the first ever emission line search forcounterparts to GW sources, we detected no lines down to a $5\sigma$ detectionlimit of $5\times10^{-17}{\rm erg\,s^{-1}\,cm^{-2}}$.

Deep and rapid observations of strong-lensing galaxy clusters within the sky localisation of GW170814