BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Erlangen Centre for Astroparticle Physics - ECPv6.2.3.2//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Erlangen Centre for Astroparticle Physics
X-ORIGINAL-URL:https://ecap.nat.fau.de
X-WR-CALDESC:Events for Erlangen Centre for Astroparticle Physics
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250206T130000
DTEND;TZID=Europe/Berlin:20250206T140000
DTSTAMP:20260416T232138
CREATED:20250204T101329Z
LAST-MODIFIED:20250204T101329Z
UID:5588-1738846800-1738850400@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Foteini Oikonomou
DESCRIPTION:Ultra-high energy cosmic rays: Constraints on the maximum-energy distribution of the sources and the possible role of ultra-fast outflows in active galactic nuclei\nAn open question in the search for ultra-high-energy cosmic-ray (UHECR) sources is whether they are few and prominent or if a large population of sources collectively contributes to the diffuse flux. Motivated by this question\, we investigated whether the latest UHECR data are consistent with originating from a population of sources that exhibit substantial diversity in terms of the cosmic-ray spectra they produce. We found that the fit to the cosmic ray data requires sources that are intrinsically very similar in terms of the maximum energy reached. This is surprising\, considering the sizeable astrophysical diversity exhibited by the candidate astrophysical source populations. One source class that may satisfy the constraints imposed by the UHECR observations is non-jetted active galactic nuclei. An increasing number of observations suggest that semi-relativistic winds\, termed ultra-fast outflows\, are present in a large fraction of these sources. In this talk\, I will show that cosmic ray nuclei can be accelerated to ultra-high energies in such ultra-fast outflows. Ultra-fast outflows can\, therefore\, possibly account for a substantial fraction of the observed diffuse UHECR flux.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-foteini-oikonomou/
LOCATION:ECAP Laboratory\, 00.061\, Nikolaus-Fiebiger-Str. 2\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
END:VEVENT
END:VCALENDAR