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SUMMARY:V. Vecchiotti - Constraints on Hadronic Emission from Microquasars
  detected by LHAASO
DTSTART:20260326T130000Z
DTEND:20260326T150000Z
DTSTAMP:20260502T072700Z
UID:indico-event-51532@agenda.infn.it
CONTACT:info-seminars@lngs.infn.it
DESCRIPTION:Speakers: Valerio D'Andrea (Istituto Nazionale di Fisica Nucle
 are)\, Dounia Helis (Istituto Nazionale di Fisica Nucleare)\, Nicola Rossi
  (Istituto Nazionale di Fisica Nucleare)\, Izabela Anna Kochanek (Istituto
  Nazionale di Fisica Nucleare)\n\nRecently\, the Large High-Altitude Air S
 hower Observatory (LHAASO) collaboration reported ultra-high-energy gamma-
 rays from six microquasar systems. For five of these\, the emission exceed
 s $100$ TeV\, making microquasars promising Galactic PeVatrons. In this wo
 rk\, we investigate whether gamma-rays around $100$ TeV can originate from
  hadronic interactions of accelerated cosmic rays with the ambient medium 
 and estimate the contribution of these sources to the CR proton knee.  Tw
 o transport scenarios are considered: one in which particle transport arou
 nd the source is dominated by advection\, and another in which it is domin
 ated by diffusion\, with the diffusion coefficient reduced with respect to
  the Galactic value. In both scenarios\, the diffusion coefficient matches
  the Galactic value at large distances from the source. We also explore tw
 o injection models: continuous cosmic-ray injection over the entire lifeti
 me of the source\, and intermittent injection during periodic outbursts. W
 e find that in both advection and diffusion scenarios\, hadrons alone cann
 ot fully explain the observed emission\, allowing us to place upper limits
  on the hadronic fraction of the flux. Finally\, we estimate the contribut
 ion of these sources to the Galactic cosmic-ray spectrum\; this quantity s
 trongly depends on source age and injection history.------------Vittoria V
 ecchiottiINAF - Osservatorio Astrofisico di Arcetri\n \n \n \nIMPORTANT
 : registration is mandatory for people without a valid LNGS badge.  \n\
 nhttps://agenda.infn.it/event/51532/
LOCATION:Room B. Pontecorvo (LNGS)
URL:https://agenda.infn.it/event/51532/
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