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.
The final #Syngeweek part is now live on our website.
"Yet meet we shall, and part and meet again
Where dead men meet, on lips of living men."
dias.ie/2020/03/23/syn…
Returning visitors don't forget to clear your cookies!
#DIASdiscovers
Today is the 25th anniversary of the passing of Professor J.L Synge. Part 6 and the final #SyngeWeek installment will go live this evening on our website at 6pm
#DIASdiscovers
#SyngeWeek Part5 is now live on our website!
"One of the attractions [of coming to DIAS] for me in 1948 was the prospect of being a colleague of Schrödinger. "
Read more: dias.ie/2020/03/23/syn…
Returning visitors remember to clear those cookies!
#DIASdiscovers
Part 5 of #SyngeWeek covers his career with DIAS, the publication of "Relativity:The General Theory" which made DIAS the leading centre for research in General relativity for the following decade.
Part 4 is availble until 6pm: dias.ie/2020/03/23/syn…#DIASdiscovers
On tonight!
Don't miss your chance to see this fascinating documentary about Schroedinger's time in DIAS and the seminal discovery it lead to. Not forgetting he was DIAS' first Director of Theoretical Physics.
@RTEOne#DIASdiscovers#schrodinger
"...sometime early in 1944, I got a phone call from Oswald Veblen, asking me whether I would like to go to Europe attached to the American Army in a scientific capacity."
#SyngeWeek Part 4: Columbus & Europe is now live on our website ➡️ dias.ie/2020/03/23/syn…#DIASdiscovers
"...he wanted to endow international medals in mathematics (a subject omitted from Nobel Prizes, on account of Nobel's jealousy of Mittag-Leffler..."
#SyngeWeek Part 3: Toronto-Dublin-Toronto
dias.ie/2020/03/23/syn…
Returning visitors please remember to clear those cookies 🍪
"Long before 1916 I had become a Nationalist, but the idea that there might be an armed rebellion was nothing more than a whispered rumour..."
#SyngeWeek part 3 will be posted on our website this evening at 6pm.
Part 2: University is available until then:
dias.ie/2020/03/23/syn…
#SyngeWeek Part Two: University, is now live on our website.
"...could force the rifle down the leg of his trousers, and we set out through the Front Gate of College; "
➡️dias.ie/2020/03/23/syn…
Returning visitors please be sure to clear those cookies🍪
#DIASdiscovers
#SyngeWeek part 2 is coming this evening. This will cover his University years.
J.L. Synge, an Irish mathematician & physicist, whose seven decade career included significant periods in Ireland (& DIAS) Canada, and the USA.
Part 1 ➡️ dias.ie/2020/03/23/syn…#DIASdiscovers
"My mother was Ellen Frances Price (1861-1935),
daughter of James Price, a distinguished Irish engineer.
I believe that, in so far as it was genetic, my interest
in mathematics came from this side of the family."- J.L Synge
More: dias.ie/2020/03/23/syn…#SyngeWeek#DIASdiscovers
DIAS-led team finds evidence that Young Star Clusters make Cosmic Rays
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Last Updated: 21st January 2020 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, News
The final #Syngeweek part is now live on our website. "Yet meet we shall, and part and meet again Where dead men meet, on lips of living men." dias.ie/2020/03/23/syn… Returning visitors don't forget to clear your cookies! #DIASdiscovers
Today is the 25th anniversary of the passing of Professor J.L Synge. Part 6 and the final #SyngeWeek installment will go live this evening on our website at 6pm #DIASdiscovers
What a great idea! 👩🚀👩🚀 twitter.com/SpaceStnExplor…
#SyngeWeek Part5 is now live on our website! "One of the attractions [of coming to DIAS] for me in 1948 was the prospect of being a colleague of Schrödinger. " Read more: dias.ie/2020/03/23/syn… Returning visitors remember to clear those cookies! #DIASdiscovers
Part 5 of #SyngeWeek covers his career with DIAS, the publication of "Relativity:The General Theory" which made DIAS the leading centre for research in General relativity for the following decade. Part 4 is availble until 6pm: dias.ie/2020/03/23/syn… #DIASdiscovers
On tonight! Don't miss your chance to see this fascinating documentary about Schroedinger's time in DIAS and the seminal discovery it lead to. Not forgetting he was DIAS' first Director of Theoretical Physics. @RTEOne #DIASdiscovers #schrodinger
Returning Visitors please remember to clear those cookies!
"...sometime early in 1944, I got a phone call from Oswald Veblen, asking me whether I would like to go to Europe attached to the American Army in a scientific capacity." #SyngeWeek Part 4: Columbus & Europe is now live on our website ➡️ dias.ie/2020/03/23/syn… #DIASdiscovers
Spring Newsletter just launched! See what has happened in 2020 so far: mailchi.mp/5ea85f227dce/d… Subscribe to our mailing list today to get future editions direct to your mailbox: dias.ie/mailinglistsub… #DIASdiscovers
"...he wanted to endow international medals in mathematics (a subject omitted from Nobel Prizes, on account of Nobel's jealousy of Mittag-Leffler..." #SyngeWeek Part 3: Toronto-Dublin-Toronto dias.ie/2020/03/23/syn… Returning visitors please remember to clear those cookies 🍪
"Long before 1916 I had become a Nationalist, but the idea that there might be an armed rebellion was nothing more than a whispered rumour..." #SyngeWeek part 3 will be posted on our website this evening at 6pm. Part 2: University is available until then: dias.ie/2020/03/23/syn…
Please note the reopening date of DIAS buildings is now 20 April. dias.ie/2020/03/13/ale… #coronavirus #StayHomeSaveLives
#SyngeWeek Part Two: University, is now live on our website. "...could force the rifle down the leg of his trousers, and we set out through the Front Gate of College; " ➡️dias.ie/2020/03/23/syn… Returning visitors please be sure to clear those cookies🍪 #DIASdiscovers
#SyngeWeek part 2 is coming this evening. This will cover his University years. J.L. Synge, an Irish mathematician & physicist, whose seven decade career included significant periods in Ireland (& DIAS) Canada, and the USA. Part 1 ➡️ dias.ie/2020/03/23/syn… #DIASdiscovers
"My mother was Ellen Frances Price (1861-1935), daughter of James Price, a distinguished Irish engineer. I believe that, in so far as it was genetic, my interest in mathematics came from this side of the family."- J.L Synge More: dias.ie/2020/03/23/syn… #SyngeWeek #DIASdiscovers