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DTSTART;TZID=Europe/Rome:20191108T114500
DTEND;TZID=Europe/Rome:20191108T124500
DTSTAMP:20260407T012134
CREATED:20191105T085225Z
LAST-MODIFIED:20191105T085225Z
UID:7038-1573213500-1573217100@www.oa-roma.inaf.it
SUMMARY:The ultraluminous X-ray pulsar NGC 5907 ULX-1 and its nebula
DESCRIPTION:Ultraluminous X-ray pulsars are accretion-powered pulsars whose X-ray\nluminosity\, if isotropic\, largely exceeds their Eddington limit. Only a handful\nare known to date and NGC 5907 ULX-1\, distant 17 Mpc from us\, is the most luminous of them\,\nat 1e41 erg/s 500 times its Eddington limit. We constrained through\npulsar timing its orbit and spin behavior\, estimating a 5d orbital period and a spin-up\ntime <40 yr. We detected an extended X-ray feature surrounding the source: likely a young and\npowerful bubble driven by the wind from the accreting pulsar system. The nebula\nhas been powered at ~1e41 erg/s for ~70 kyr proving that a highly super-Eddington\nregime can be sustained for much longer than the spin-up time of the pulsar.\nI will present the current status of the observations and understanding of this system\nand the prospects to solve the still open problems it raises.
URL:https://www.oa-roma.inaf.it/event/the-ultraluminous-x-ray-pulsar-ngc-5907-ulx-1-and-its-nebula/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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