| 1. |
- Iping, Rosina C., et al.
(författare)
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Search for O VI Emission from the Shocked Circumstellar Ring of SN 1987A
- 2007
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Ingår i: SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. - : AIP. - 9780735404489 ; , s. 182-184
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A search for O VI 1032-38 Å emission from the circumstellar shock interaction zones of SN 1987A was made with the FUSE satellite. The shock interaction of supernova ejecta with the dense inner ring began in the mid-1990s. Broad (FWHM ~300 km s−1) emission from optical coronal lines (e.g. [Fe X], [Fe XI], and [Fe XIV]) has emerged and increased exponentially in strength. O VI emission is expected to track the coronal lines and is expected to be the primary cooling transition for the million-degree shocked gas. In the most recent FUSE observation of SN 1987A, June 2004, a weak broad O VI feature may be present. An upper limit on the intrinsic O VI flux is ~1×10−13 erg cm−2 s−1 (corrected for foreground Galactic and LMC extinction). A follow-up observation of planned for mid-2007.
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| 2. |
- Lundqvist, Peter
(författare)
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The Flash Ionization of the Circumstellar Gas of SN 1987A
- 2007
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Ingår i: UPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. - : AIP. - 9780735404489
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The photons from the shock breakout of SN 1987A ionized the gas they encountered in less than a few hours. Twenty years later the recombining circumstellar gas is still glowing. Here we discuss what the analysis of this emission has revealed about the structure and properties of the circumstellar gas, as well as about the properties of the shock breakout.
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| 3. |
- Nymark, Tanja, et al.
(författare)
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Modeling the X-Rays from SNe 1993J & 1998S
- 2007
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Ingår i: Supernova 1987A. - : American Institute of Physics (AIP). - 9780735404489 ; , s. 430-432
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Konferensbidrag (refereegranskat)abstract
- The X-ray emission from the Type II supernovae SNe 1993J and 1998S is modelled using the numerical code described in Nymark et al. (2006), assuming that most of the observed Xray emission comes from the reverse shock created by the interaction between the supernova ejecta and a dense circumstellar medium. We find that the spectra of both SNe are compatible with a CNO-enriched composition. For SN 1998S we find evidence for a component from both the reverse and forward shocks while the X-ray flux for SN 1993J is dominated by the reverse shock.
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| 4. |
- Nymark, Tanja, et al.
(författare)
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Modeling the X‐rays from SNe 1993J & 1998S
- 2007
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Ingår i: AIP Conference Proceedings. - : AIP. - 0094-243X .- 1551-7616. - 9780735404489 ; 937:430, s. 430-432
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Tidskriftsartikel (refereegranskat)abstract
- TheX-ray emission from the Type II supernovae SNe 1993J and1998S is modelled using the numerical code described in Nymarket al. (2006), assuming that most of the observed X-ray emissioncomes from the reverse shock created by the interaction betweenthe supernova ejecta and a dense circumstellar medium. We findthat the spectra of both SNe are compatible with aCNO-enriched composition. For SN 1998S we find evidence for acomponent from both the reverse and forward shock, while theX-ray flux for SN 1993J is dominated by the reverseshock.
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