Nucleosynthesis and mixing in Cassiopeia A

John P. Hughes, Cara E. Rakowski, David Nelson Burrows, Patrick O. Slane

Research output: Contribution to journalArticle

214 Citations (Scopus)

Abstract

We present results from the first light observations of the Cassiopeia A supernova remnant (SNR) by the Chandra X-Ray Observatory. Based on representative spectra from four selected regions, we investigate the processes of nucleosynthesis and mixing in Cas A. We make the first unequivocal identification of iron-rich ejecta produced by explosive silicon burning in a young Galactic SNR. Elsewhere in the remnant, we see silicon-rich ejecta from explosive oxygen burning. The Fe-rich ejecta lie outside the Si-rich material, indicating that bulk motions were extensive and energetic enough in Cas A to cause a spatial inversion of a significant portion of the supernova core. It is likely that this inversion was caused by "Fe"-rich ejecta emerging in plumes from the rising bubbles in the neutrino-driven convection layer during the supernova explosion. In addition, the radioactive decay energy from 56Ni may have contributed to the subsequent evolution of the material. We have also discovered faint, well-defined filaments with featureless X-ray spectra that are possibly sites of cosmic-ray acceleration in Cas A.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume528
Issue number2 PART 2
StatePublished - Jan 10 2000

Fingerprint

Cassiopeia A
ejecta
nuclear fusion
supernova remnants
silicon
supernovae
explosive
inversions
radioactive decay
cosmic ray
plumes
explosions
bubble
explosion
cosmic rays
emerging
filaments
observatories
x rays
convection

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hughes, J. P., Rakowski, C. E., Burrows, D. N., & Slane, P. O. (2000). Nucleosynthesis and mixing in Cassiopeia A. Astrophysical Journal, 528(2 PART 2).
Hughes, John P. ; Rakowski, Cara E. ; Burrows, David Nelson ; Slane, Patrick O. / Nucleosynthesis and mixing in Cassiopeia A. In: Astrophysical Journal. 2000 ; Vol. 528, No. 2 PART 2.
@article{8b7ce8d54f5b426eb51b9088a81d6645,
title = "Nucleosynthesis and mixing in Cassiopeia A",
abstract = "We present results from the first light observations of the Cassiopeia A supernova remnant (SNR) by the Chandra X-Ray Observatory. Based on representative spectra from four selected regions, we investigate the processes of nucleosynthesis and mixing in Cas A. We make the first unequivocal identification of iron-rich ejecta produced by explosive silicon burning in a young Galactic SNR. Elsewhere in the remnant, we see silicon-rich ejecta from explosive oxygen burning. The Fe-rich ejecta lie outside the Si-rich material, indicating that bulk motions were extensive and energetic enough in Cas A to cause a spatial inversion of a significant portion of the supernova core. It is likely that this inversion was caused by {"}Fe{"}-rich ejecta emerging in plumes from the rising bubbles in the neutrino-driven convection layer during the supernova explosion. In addition, the radioactive decay energy from 56Ni may have contributed to the subsequent evolution of the material. We have also discovered faint, well-defined filaments with featureless X-ray spectra that are possibly sites of cosmic-ray acceleration in Cas A.",
author = "Hughes, {John P.} and Rakowski, {Cara E.} and Burrows, {David Nelson} and Slane, {Patrick O.}",
year = "2000",
month = "1",
day = "10",
language = "English (US)",
volume = "528",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART 2",

}

Hughes, JP, Rakowski, CE, Burrows, DN & Slane, PO 2000, 'Nucleosynthesis and mixing in Cassiopeia A', Astrophysical Journal, vol. 528, no. 2 PART 2.

Nucleosynthesis and mixing in Cassiopeia A. / Hughes, John P.; Rakowski, Cara E.; Burrows, David Nelson; Slane, Patrick O.

In: Astrophysical Journal, Vol. 528, No. 2 PART 2, 10.01.2000.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nucleosynthesis and mixing in Cassiopeia A

AU - Hughes, John P.

AU - Rakowski, Cara E.

AU - Burrows, David Nelson

AU - Slane, Patrick O.

PY - 2000/1/10

Y1 - 2000/1/10

N2 - We present results from the first light observations of the Cassiopeia A supernova remnant (SNR) by the Chandra X-Ray Observatory. Based on representative spectra from four selected regions, we investigate the processes of nucleosynthesis and mixing in Cas A. We make the first unequivocal identification of iron-rich ejecta produced by explosive silicon burning in a young Galactic SNR. Elsewhere in the remnant, we see silicon-rich ejecta from explosive oxygen burning. The Fe-rich ejecta lie outside the Si-rich material, indicating that bulk motions were extensive and energetic enough in Cas A to cause a spatial inversion of a significant portion of the supernova core. It is likely that this inversion was caused by "Fe"-rich ejecta emerging in plumes from the rising bubbles in the neutrino-driven convection layer during the supernova explosion. In addition, the radioactive decay energy from 56Ni may have contributed to the subsequent evolution of the material. We have also discovered faint, well-defined filaments with featureless X-ray spectra that are possibly sites of cosmic-ray acceleration in Cas A.

AB - We present results from the first light observations of the Cassiopeia A supernova remnant (SNR) by the Chandra X-Ray Observatory. Based on representative spectra from four selected regions, we investigate the processes of nucleosynthesis and mixing in Cas A. We make the first unequivocal identification of iron-rich ejecta produced by explosive silicon burning in a young Galactic SNR. Elsewhere in the remnant, we see silicon-rich ejecta from explosive oxygen burning. The Fe-rich ejecta lie outside the Si-rich material, indicating that bulk motions were extensive and energetic enough in Cas A to cause a spatial inversion of a significant portion of the supernova core. It is likely that this inversion was caused by "Fe"-rich ejecta emerging in plumes from the rising bubbles in the neutrino-driven convection layer during the supernova explosion. In addition, the radioactive decay energy from 56Ni may have contributed to the subsequent evolution of the material. We have also discovered faint, well-defined filaments with featureless X-ray spectra that are possibly sites of cosmic-ray acceleration in Cas A.

UR - http://www.scopus.com/inward/record.url?scp=0034627516&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034627516&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034627516

VL - 528

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 2

ER -

Hughes JP, Rakowski CE, Burrows DN, Slane PO. Nucleosynthesis and mixing in Cassiopeia A. Astrophysical Journal. 2000 Jan 10;528(2 PART 2).