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Ti-44 Gamma-Ray Emission Lines from SN1987A Reveal an Asymmetric ExplosionIn core-collapse supernovae, titanium-44 (Ti-44) is produced in the innermost ejecta, in the layer of material directly on top of the newly formed compact object. As such, it provides a direct probe of the supernova engine. Observations of supernova 1987A (SN1987A) have resolved the 67.87- and 78.32-kilo-electron volt emission lines from decay of Ti-44 produced in the supernova explosion. These lines are narrow and redshifted with a Doppler velocity of ~700 kilometers per second, direct evidence of large-scale asymmetry in the explosion.
Document ID
20160010524
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Boggs, S. E.
(California Univ. Berkeley, CA, United States)
Harrison, F. A.
(California Inst. of Tech. Pasadena, CA, United States)
Miyasaka, H.
(California Inst. of Tech. Pasadena, CA, United States)
Grefenstette, B. W.
(California Inst. of Tech. Pasadena, CA, United States)
Zoglauer, A.
(California Univ. Berkeley, CA, United States)
Fryer, C. L.
(Los Alamos National Lab. NM, United States)
Reynolds, S. P.
(North Carolina State Univ. Raleigh, NC, United States)
Alexander, D. M.
(Durham Univ. United Kingdom)
An, H.
(McGill Univ. Montreal, Quebec, Canada)
Barret, D.
(Institut de Recherche en Astrophysique et Planetologie (UMR) Toulouse, France)
Christensen, F. E.
(Technical Univ. of Denmark Lyngby, Denmark)
Craig, W. W.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Forster, K.
(California Inst. of Tech. Pasadena, CA, United States)
Giommi, P.
(Italian Space Agency Matera, Italy)
Hailey, C. J.
(Columbia Univ. New York, NY, United States)
Hornstrup, A.
(Technical Univ. of Denmark Lyngby, Denmark)
Kitaguchi, T.
(Institute of Physical and Chemical Research Saitama, Japan)
Koglin, J. E.
(Kavli Inst. for Particle Astrophysics and Cosmology Menlo Park, CA, United States)
Madsen, K. K.
(California Inst. of Tech. Pasadena, CA, United States)
Zhang, W. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2016
Publication Date
May 8, 2015
Publication Information
Publication: Science Magazine
Publisher: American Association for the Advancement of Science,
Volume: 348
Issue: 6235
e-ISSN: 1095-9203
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN34983
Funding Number(s)
CONTRACT_GRANT: NNG08FD60C
Distribution Limits
Public
Copyright
Other
Keywords
44Ti gamma-ray emission lines

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