Massive stars produced at the collapse of giant molecular clouds, form compact groups and remain tightly linked during their entire life. Acceleration of particles in these objects can be initiated by interacting winds directly in the vicinity of stars or in the so-called superbubbles driven by stellar winds and SN explosions (see Figure).
The conditions in these objects can be more favorable for particle acceleration to PeV energies than in individual SNRs. This makes the clusters of massive young stars an attractive alternative to SNRs as CR factories contributing to the highest energy CRs around the “knee”.
DIAS researchers have led a team to report on a compelling similarity of the energy and radial distributions of multi-TeV protons extracted from observations of gamma-ray from these extended structures surrounding three young star clusters (for detail see https://www.nature.com/articles/s41550-019-0724-0). The derived 1/r decrement of the CR density with the distance from a star cluster is a distinct signature of continuous, over a few million years, cosmic ray injection into the interstellar medium. The hard (E-2.3 type) energy spectra and the required high acceleration efficiency derived from gamma-ray data, point to clusters of young massive stars as promising candidates for cosmic PeVatrons (accelerators boosting the energy of protons up to energy 1 PeV=1015 eV) and dominant contributors to the flux of highest energy cosmic rays in the Milky Way.
Our final Samhain agus Science event is now confirmed!
Dunsink Observatory will host it's first ever movie screening on Saturday 02 Nov. This special screening of E.T. The Extra-Terrestrial is not to be missed.
Tickets on Sale tomorrow via Eventbrite
eventbrite.ie/e/samhain-agus…
Thanks to @dubfire for their hasty response and saving tonight's open evening. Here they are checking out the telescope with @petertgallagher after all their hard work! 🔥🚒
Tonight is DIAS's last @Histfest event for 2019. Thanks to all who took part! The open night at DIAS Dunsink Observatory is completely booked out!
Fear Not! Our Samhain agus Science mini-fest kicks off on the 30 October.
Book your free place here: eventbrite.ie/o/dublin-insti…
While there is an obvious @DIASDunsink link, there is another #DIAS link to this event. Pictured on the right here you will see @TomRayDIAS with his daughter @Emma_Ray_Artist whose own flash of creativity won the commission in 2018.
What a day yesterday! Amazing autumnal sunshine for not only the Hamilton walk but the official unveiling of the new artwork commemorating William Rowan Hamilton's "eureka" moment at what is now Broombridge luas stop.
DIAS-led team finds evidence that Young Star Clusters make Cosmic Rays
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Last Updated: 17th April 2019 by Niamh Breathnach
Massive stars produced at the collapse of giant molecular clouds, form compact groups and remain tightly linked during their entire life. Acceleration of particles in these objects can be initiated by interacting winds directly in the vicinity of stars or in the so-called superbubbles driven by stellar winds and SN explosions (see Figure).
The conditions in these objects can be more favorable for particle acceleration to PeV energies than in individual SNRs. This makes the clusters of massive young stars an attractive alternative to SNRs as CR factories contributing to the highest energy CRs around the “knee”.
DIAS researchers have led a team to report on a compelling similarity of the energy and radial distributions of multi-TeV protons extracted from observations of gamma-ray from these extended structures surrounding three young star clusters (for detail see https://www.nature.com/articles/s41550-019-0724-0). The derived 1/r decrement of the CR density with the distance from a star cluster is a distinct signature of continuous, over a few million years, cosmic ray injection into the interstellar medium. The hard (E-2.3 type) energy spectra and the required high acceleration efficiency derived from gamma-ray data, point to clusters of young massive stars as promising candidates for cosmic PeVatrons (accelerators boosting the energy of protons up to energy 1 PeV=1015 eV) and dominant contributors to the flux of highest energy cosmic rays in the Milky Way.
Category: Astronomy and Astrophysics Section News & Events, Featured Blog Posts, News
Our final Samhain agus Science event is now confirmed! Dunsink Observatory will host it's first ever movie screening on Saturday 02 Nov. This special screening of E.T. The Extra-Terrestrial is not to be missed. Tickets on Sale tomorrow via Eventbrite eventbrite.ie/e/samhain-agus…
Exciting times! twitter.com/Space_Station/…
DIAS's @Luke_Drury hasn't slowed down on retirement. He recently attended an Open Science fair in Porto in his capacity as an @ALLEA_academies board member to introduce some key points on the Plan S project. More here ➡️allea.org/allea-discusse… #DIASdiscovers
🤩 twitter.com/sam_green93/st…
Thanks to @dubfire for their hasty response and saving tonight's open evening. Here they are checking out the telescope with @petertgallagher after all their hard work! 🔥🚒
Tonight is DIAS's last @Histfest event for 2019. Thanks to all who took part! The open night at DIAS Dunsink Observatory is completely booked out! Fear Not! Our Samhain agus Science mini-fest kicks off on the 30 October. Book your free place here: eventbrite.ie/o/dublin-insti…
The competition was commissioned by the @RIAdawson, @TFIupdates and Transport Infrastructure Ireland. #DIASdiscovers
While there is an obvious @DIASDunsink link, there is another #DIAS link to this event. Pictured on the right here you will see @TomRayDIAS with his daughter @Emma_Ray_Artist whose own flash of creativity won the commission in 2018.
What a day yesterday! Amazing autumnal sunshine for not only the Hamilton walk but the official unveiling of the new artwork commemorating William Rowan Hamilton's "eureka" moment at what is now Broombridge luas stop.