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

Pair instabilities in supernovae might prevent the formation of black holeswith masses between $\sim 50 M_\odot$ and $\sim 130 M_\odot$. Multiplegenerations of black-hole mergers provide a possible way to populate this "massgap" from below. However this requires an astrophysical environment with asufficiently large escape speed to retain merger remnants, and prevent themfrom being ejected by gravitational-wave recoils. We show that, if the mass gapis indeed populated by multiple mergers, the observation of a single black-holebinary component in the mass gap implies that its progenitors grew in anenvironment with escape speed $v_{\rm esc} \gtrsim 50$ km/s. This is largerthan the escape speeds of most globular clusters, requiring denser and heavierenvironments such as nuclear star clusters or disks-assisted migration ingalactic nuclei. A single detection in the upper mass gap would hint at theexistence of a much larger population of first-generation events from the sameenvironment, thus providing a tool to disentangle the contribution of differentformation channels to the observed merger rate.

Escape speed of stellar clusters from multiple-generation black-hole mergers in the upper mass gap