Gamma-ray spectroscopy of galactic nucleosynthesis

Roland Diehl; Jochen Greiner; Martin Krause; Moritz Pleintinger; Thomas Siegert

doi:10.1051/epjconf/202327902001

Gamma-ray spectroscopy of galactic nucleosynthesis

Roland Diehl, Jochen Greiner, Martin Krause, Moritz Pleintinger, Thomas Siegert

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Abstract

Diffuse gamma-ray emission from the decay of radioactive $^{26}$Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed to ejections from massive stars and their supernovae, the gamma-ray signal includes information about nucleosynthesis in massive star interiors as it varies with evolutionary stages, and about their feedback on the surrounding interstellar medium. Our method of population synthesis of massive-star groups has been refined as a diagnostic tool for this purpose. It allows to build a bottom-up prediction of the diffuse gamma-ray sky when known massive star group distributions and theoretical models of stellar evolution and core-collapse supernova explosions are employed. We find general consistency of an origin in such massive-star groups, in particular we also find support for the clumpy distribution of such source regions across the Galaxy, and characteristics of large cavities around these. A discrepancy in the integrated $^{26}$Al gamma-ray flux is interpreted as an indication for excess $^{26}$Al emission from nearby, distributed in cavities that extend over major regions of the sky.

Original language	English
Pages	1-6
Number of pages	6
DOIs	https://doi.org/10.1051/epjconf/202327902001
Publication status	E-pub ahead of print - 22 Mar 2023
Event	Nuclear Physics in Astrophysics X - Geneva, Italy Duration: 5 Sept 2022 → 9 Sept 2022 https://indico.cern.ch/event/804609/#:~:text=Every%20two%20years%20the%20Nuclear,and%20fast%20developing%20research%20fields.

Conference

Conference	Nuclear Physics in Astrophysics X
Abbreviated title	NPA-X 20222
Country/Territory	Italy
City	Geneva
Period	5/09/22 → 9/09/22
Internet address	https://indico.cern.ch/event/804609/#:~:text=Every%20two%20years%20the%20Nuclear,and%20fast%20developing%20research%20fields.

Keywords

astro-ph.HE

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10.1051/epjconf/202327902001Licence: CC BY

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© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Final published version, 5.19 MBLicence: CC BY

Cite this

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title = "Gamma-ray spectroscopy of galactic nucleosynthesis",

abstract = " Diffuse gamma-ray emission from the decay of radioactive $^{26}$Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed to ejections from massive stars and their supernovae, the gamma-ray signal includes information about nucleosynthesis in massive star interiors as it varies with evolutionary stages, and about their feedback on the surrounding interstellar medium. Our method of population synthesis of massive-star groups has been refined as a diagnostic tool for this purpose. It allows to build a bottom-up prediction of the diffuse gamma-ray sky when known massive star group distributions and theoretical models of stellar evolution and core-collapse supernova explosions are employed. We find general consistency of an origin in such massive-star groups, in particular we also find support for the clumpy distribution of such source regions across the Galaxy, and characteristics of large cavities around these. A discrepancy in the integrated $^{26}$Al gamma-ray flux is interpreted as an indication for excess $^{26}$Al emission from nearby, distributed in cavities that extend over major regions of the sky. ",

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author = "Roland Diehl and Jochen Greiner and Martin Krause and Moritz Pleintinger and Thomas Siegert",

note = "{\textcopyright} The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).; Nuclear Physics in Astrophysics X, NPA-X 20222 ; Conference date: 05-09-2022 Through 09-09-2022",

year = "2023",

month = mar,

day = "22",

doi = "10.1051/epjconf/202327902001",

language = "English",

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TY - CONF

T1 - Gamma-ray spectroscopy of galactic nucleosynthesis

AU - Diehl, Roland

AU - Greiner, Jochen

AU - Krause, Martin

AU - Pleintinger, Moritz

AU - Siegert, Thomas

N1 - © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).

PY - 2023/3/22

Y1 - 2023/3/22

N2 - Diffuse gamma-ray emission from the decay of radioactive $^{26}$Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed to ejections from massive stars and their supernovae, the gamma-ray signal includes information about nucleosynthesis in massive star interiors as it varies with evolutionary stages, and about their feedback on the surrounding interstellar medium. Our method of population synthesis of massive-star groups has been refined as a diagnostic tool for this purpose. It allows to build a bottom-up prediction of the diffuse gamma-ray sky when known massive star group distributions and theoretical models of stellar evolution and core-collapse supernova explosions are employed. We find general consistency of an origin in such massive-star groups, in particular we also find support for the clumpy distribution of such source regions across the Galaxy, and characteristics of large cavities around these. A discrepancy in the integrated $^{26}$Al gamma-ray flux is interpreted as an indication for excess $^{26}$Al emission from nearby, distributed in cavities that extend over major regions of the sky.

AB - Diffuse gamma-ray emission from the decay of radioactive $^{26}$Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed to ejections from massive stars and their supernovae, the gamma-ray signal includes information about nucleosynthesis in massive star interiors as it varies with evolutionary stages, and about their feedback on the surrounding interstellar medium. Our method of population synthesis of massive-star groups has been refined as a diagnostic tool for this purpose. It allows to build a bottom-up prediction of the diffuse gamma-ray sky when known massive star group distributions and theoretical models of stellar evolution and core-collapse supernova explosions are employed. We find general consistency of an origin in such massive-star groups, in particular we also find support for the clumpy distribution of such source regions across the Galaxy, and characteristics of large cavities around these. A discrepancy in the integrated $^{26}$Al gamma-ray flux is interpreted as an indication for excess $^{26}$Al emission from nearby, distributed in cavities that extend over major regions of the sky.

KW - astro-ph.HE

U2 - 10.1051/epjconf/202327902001

DO - 10.1051/epjconf/202327902001

M3 - Paper

SP - 1

EP - 6

T2 - Nuclear Physics in Astrophysics X

Y2 - 5 September 2022 through 9 September 2022

ER -

Gamma-ray spectroscopy of galactic nucleosynthesis

Abstract

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Keywords

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