{"id":4478,"date":"2025-07-10T11:24:59","date_gmt":"2025-07-10T09:24:59","guid":{"rendered":"https:\/\/www.oa-cagliari.inaf.it\/seminari\/quali-sono-gli-spin-dei-buchi-neri-di-massa-stellare\/"},"modified":"2025-09-22T19:00:57","modified_gmt":"2025-09-22T17:00:57","slug":"quali-sono-gli-spin-dei-buchi-neri-di-massa-stellare","status":"publish","type":"seminari","link":"https:\/\/www.oa-cagliari.inaf.it\/en\/seminars\/quali-sono-gli-spin-dei-buchi-neri-di-massa-stellare\/","title":{"rendered":"What are the spins of stellar-mass black holes?"},"content":{"rendered":"

\"Quali<\/p>\n

In recent years, spins of merging black holes have been relatively accurately measured based on their gravitational-wave signals. Their spins are generally low, with the estimated average effective spin parameter as low as 0.06.<\/p>\n

On the other hand, spins of many accreting black-hole binaries have been measured to be high, some close to the maximum spin parameter of 1, e.g. greater than 0.9985 at 3 sigma in Cyg X-1. I will present our recent results regarding this discrepancy.
\nIn particular, I will discuss possible systematic effects affecting the spin measurements in accreting systems and whether they can be reconciled with those based on gravitational waves.<\/p>\n","protected":false},"template":"","class_list":["post-4478","seminari","type-seminari","status-publish","hentry","categorie_seminari-colloquium"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari\/4478","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari"}],"about":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/types\/seminari"}],"wp:attachment":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/media?parent=4478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}