Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane

M. J. Harris; W. R. Purcell; D. A. Grabelsky; W. N. Johnson; G. V. Jung; R. L. Kinzer; J. D. Kurfess; K. McNaron-Brown; M. S. Strickman; M. P. Ulmer

Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane

M. J. Harris^*, W. R. Purcell, D. A. Grabelsky, W. N. Johnson, G. V. Jung, R. L. Kinzer, J. D. Kurfess, K. McNaron-Brown, M. S. Strickman, M. P. Ulmer

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (²²Na, 1.275 MeV: ⁶⁰Fe, 1.17 and 1.33 MeV) and cosmic-ray induced γ-ray lines (de-excitation of ¹²C*, 4.44 MeV, and of ¹⁶O*, 6.13 MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from ²²Na, down to 3 σ upper limits ≃ 2 10^-4 γ/(cm²-secrad). We find weak evidence (≈ 2σ) of ⁶⁰Fe line emission from positive Galactic longitudes in the central radian.

Original language	English (US)
Pages (from-to)	343-347
Number of pages	5
Journal	Astronomy and Astrophysics Supplement Series
Volume	120
Issue number	4
State	Published - Dec 1 1996

Keywords

Abundances - Gamma-rays
Cosmic rays - Galaxy
Nuclear reactions, nucleosynthesis, abundances - Ism
Observations

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{40f43285737b4d37bf8d703024e1be90,

title = "Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane",

abstract = "We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (22Na, 1.275 MeV: 60Fe, 1.17 and 1.33 MeV) and cosmic-ray induced γ-ray lines (de-excitation of 12C*, 4.44 MeV, and of 16O*, 6.13 MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from 22Na, down to 3 σ upper limits ≃ 2 10-4 γ/(cm2-secrad). We find weak evidence (≈ 2σ) of 60Fe line emission from positive Galactic longitudes in the central radian.",

keywords = "Abundances - Gamma-rays, Cosmic rays - Galaxy, Nuclear reactions, nucleosynthesis, abundances - Ism, Observations",

author = "Harris, {M. J.} and Purcell, {W. R.} and Grabelsky, {D. A.} and Johnson, {W. N.} and Jung, {G. V.} and Kinzer, {R. L.} and Kurfess, {J. D.} and K. McNaron-Brown and Strickman, {M. S.} and Ulmer, {M. P.}",

year = "1996",

month = dec,

day = "1",

language = "English (US)",

volume = "120",

pages = "343--347",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "4",

}

Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane. / Harris, M. J.; Purcell, W. R.; Grabelsky, D. A.; Johnson, W. N.; Jung, G. V.; Kinzer, R. L.; Kurfess, J. D.; McNaron-Brown, K.; Strickman, M. S.; Ulmer, M. P.

In: Astronomy and Astrophysics Supplement Series, Vol. 120, No. 4, 01.12.1996, p. 343-347.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane

AU - Harris, M. J.

AU - Purcell, W. R.

AU - Grabelsky, D. A.

AU - Johnson, W. N.

AU - Jung, G. V.

AU - Kinzer, R. L.

AU - Kurfess, J. D.

AU - McNaron-Brown, K.

AU - Strickman, M. S.

AU - Ulmer, M. P.

PY - 1996/12/1

Y1 - 1996/12/1

N2 - We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (22Na, 1.275 MeV: 60Fe, 1.17 and 1.33 MeV) and cosmic-ray induced γ-ray lines (de-excitation of 12C*, 4.44 MeV, and of 16O*, 6.13 MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from 22Na, down to 3 σ upper limits ≃ 2 10-4 γ/(cm2-secrad). We find weak evidence (≈ 2σ) of 60Fe line emission from positive Galactic longitudes in the central radian.

AB - We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (22Na, 1.275 MeV: 60Fe, 1.17 and 1.33 MeV) and cosmic-ray induced γ-ray lines (de-excitation of 12C*, 4.44 MeV, and of 16O*, 6.13 MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from 22Na, down to 3 σ upper limits ≃ 2 10-4 γ/(cm2-secrad). We find weak evidence (≈ 2σ) of 60Fe line emission from positive Galactic longitudes in the central radian.

KW - Abundances - Gamma-rays

KW - Cosmic rays - Galaxy

KW - Nuclear reactions, nucleosynthesis, abundances - Ism

KW - Observations

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M3 - Article

AN - SCOPUS:3643137485

VL - 120

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EP - 347

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 4

ER -

Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane

Abstract

Keywords

ASJC Scopus subject areas

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