CGRO/OSSE observations of the Cassiopeia A supernova remnant

L. S. The; M. D. Leising; D. D. Clayton; W. N. Johnson; R. L. Kinzer; J. D. Kurfess; M. S. Strickman; G. V. Jung; D. A. Grabelsky; W. R. Purcell; M. P. Ulmer

doi:10.1086/175600

CGRO/OSSE observations of the Cassiopeia A supernova remnant

L. S. The^*, M. D. Leising, D. D. Clayton, W. N. Johnson, R. L. Kinzer, J. D. Kurfess, M. S. Strickman, G. V. Jung, D. A. Grabelsky, W. R. Purcell, M. P. Ulmer

^*Corresponding author for this work

Physics and Astronomy

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Abstract

Cassipeia A, the youngest known supernova remnant in the Galaxy and a strong radio and X-ray source, was observed by OSSE 1992 July 16-August 6. Its close distance (∼3 kpc) and its young age (∼300 yr) make Cas A the best candidate among known supernova remnants for detecting ⁴⁴Ti γ-ray lines. We find no evidence of emission at 67.9 keV, 78.4 keV, or 1.157 MeV, the three strongest ⁴⁴Ti decay lines. From simultaneous fits to the three lines our 99% confidence upper limit to the flux in each line is 5.5 × 10^-5 γ cm^-2 s ^-1 We also report upper limits for the 4.44 MeV ¹²C nuclear de-excitation line, which could be produced by interactions of accelerated particles in the supernova remnant, and for the hard X-ray continuum.

Original language	English (US)
Pages (from-to)	244-250
Number of pages	7
Journal	Astrophysical Journal
Volume	444
Issue number	1
DOIs	https://doi.org/10.1086/175600
State	Published - May 1 1995

Keywords

Gamma rays: observations
ISM: indvidual (Cassiopeia A)
Nuclear reactions, nucleosynthesis, abundances
Supernova remnants

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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@article{d1833c11d0fd4c5aa83a8c22bc97459b,

title = "CGRO/OSSE observations of the Cassiopeia A supernova remnant",

abstract = "Cassipeia A, the youngest known supernova remnant in the Galaxy and a strong radio and X-ray source, was observed by OSSE 1992 July 16-August 6. Its close distance (∼3 kpc) and its young age (∼300 yr) make Cas A the best candidate among known supernova remnants for detecting 44Ti γ-ray lines. We find no evidence of emission at 67.9 keV, 78.4 keV, or 1.157 MeV, the three strongest 44Ti decay lines. From simultaneous fits to the three lines our 99% confidence upper limit to the flux in each line is 5.5 × 10-5 γ cm-2 s -1 We also report upper limits for the 4.44 MeV 12C nuclear de-excitation line, which could be produced by interactions of accelerated particles in the supernova remnant, and for the hard X-ray continuum.",

keywords = "Gamma rays: observations, ISM: indvidual (Cassiopeia A), Nuclear reactions, nucleosynthesis, abundances, Supernova remnants",

author = "The, {L. S.} and Leising, {M. D.} and Clayton, {D. D.} and Johnson, {W. N.} and Kinzer, {R. L.} and Kurfess, {J. D.} and Strickman, {M. S.} and Jung, {G. V.} and Grabelsky, {D. A.} and Purcell, {W. R.} and Ulmer, {M. P.}",

year = "1995",

month = may,

day = "1",

doi = "10.1086/175600",

language = "English (US)",

volume = "444",

pages = "244--250",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - CGRO/OSSE observations of the Cassiopeia A supernova remnant

AU - The, L. S.

AU - Leising, M. D.

AU - Clayton, D. D.

AU - Johnson, W. N.

AU - Kinzer, R. L.

AU - Kurfess, J. D.

AU - Strickman, M. S.

AU - Jung, G. V.

AU - Grabelsky, D. A.

AU - Purcell, W. R.

AU - Ulmer, M. P.

PY - 1995/5/1

Y1 - 1995/5/1

N2 - Cassipeia A, the youngest known supernova remnant in the Galaxy and a strong radio and X-ray source, was observed by OSSE 1992 July 16-August 6. Its close distance (∼3 kpc) and its young age (∼300 yr) make Cas A the best candidate among known supernova remnants for detecting 44Ti γ-ray lines. We find no evidence of emission at 67.9 keV, 78.4 keV, or 1.157 MeV, the three strongest 44Ti decay lines. From simultaneous fits to the three lines our 99% confidence upper limit to the flux in each line is 5.5 × 10-5 γ cm-2 s -1 We also report upper limits for the 4.44 MeV 12C nuclear de-excitation line, which could be produced by interactions of accelerated particles in the supernova remnant, and for the hard X-ray continuum.

AB - Cassipeia A, the youngest known supernova remnant in the Galaxy and a strong radio and X-ray source, was observed by OSSE 1992 July 16-August 6. Its close distance (∼3 kpc) and its young age (∼300 yr) make Cas A the best candidate among known supernova remnants for detecting 44Ti γ-ray lines. We find no evidence of emission at 67.9 keV, 78.4 keV, or 1.157 MeV, the three strongest 44Ti decay lines. From simultaneous fits to the three lines our 99% confidence upper limit to the flux in each line is 5.5 × 10-5 γ cm-2 s -1 We also report upper limits for the 4.44 MeV 12C nuclear de-excitation line, which could be produced by interactions of accelerated particles in the supernova remnant, and for the hard X-ray continuum.

KW - Gamma rays: observations

KW - ISM: indvidual (Cassiopeia A)

KW - Nuclear reactions, nucleosynthesis, abundances

KW - Supernova remnants

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U2 - 10.1086/175600

DO - 10.1086/175600

M3 - Article

AN - SCOPUS:11944274083

SN - 0004-637X

VL - 444

SP - 244

EP - 250

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

CGRO/OSSE observations of the Cassiopeia A supernova remnant

Abstract

Keywords

ASJC Scopus subject areas

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