The Progenitor of the New COMPTEL/ROSAT Supernova Remnant in Vela

Abstract

We show that (1) the newly discovered supernova remnant (SNR), GRO J0852--4642/RX J0852.0--4622, was created by a core-collapse supernova of a massive star, and (2) the same supernova event which produced the ${}^{44}$Ti detected by COMPTEL from this source is probably also responsible for a large fraction of the observed ${}^{26}$Al emission in the Vela region detected by the same instrument. The first conclusion is based on the fact that the remnant is currently expanding too slowly given its young age for it to be caused by a Type Ia supernova. If the current SNR shell expansion speed is greater than 3000 km/s, a $15M_{\odot }$ Type II supernova with a moderate kinetic energy exploding at about 150 pc away is favored. If the SNR expansion speed is lower than 2000 km s${}^{-1}$, as derived naively from the X-ray data, a much more energetic supernova is required to have occurred at $\sim 250$ pc away in a dense environment at the edge of the Gum nebula. This progenitor has a preferred ejecta mass of $\le 10M_{\odot }$ and therefore, it is probably a Type Ib or Type Ic supernova. However, the required high ambient density of $n_H\ge 100c{m}^{-3}$ in this scenario is difficult to reconcile with the regional CO data. A combination of our estimates of the age/energetics of the new SNR and the almost perfect positional coincidence of the new SNR with the centroid of the COMPTEL ${}^{26}$Al emission feature of the Vela region strongly favors a causal connection. If confirmed, this will be the first case where both ${}^{44}$Ti and ${}^{26}$Al are detected from the same young SNR and together they can be used to select preferred theoretical core-collapse supernova models.

Revised, 10 pages, 2 figures, to appear in ApJ Lett Vol.514 on April 1, 1999

Cited by in corpus (11)

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• HESS Observations and VLT Spectroscopy of PG 1553+113
• On the Expansion Rate, Age, and Distance of the Supernova Remnant G266.2-1.2 (Vela Jr.)
• Bullets in a Core Collapse Supernova Remnant: The Vela Remnant
• A detailed study of the interstellar protons toward the TeV $\gamma$-ray SNR RX J0852.0$-$4622 (G266.2$-$1.2, Vela Jr.); a third case of the $\gamma$-rays and ISM spatial correspondence
• Non-Thermal X-ray Emission from the Northwestern Rim of the Galactic Supernova Remnant G266.2-1.2 (RX J0852.0-4622)
• Neutron star natal kick and jets in core collapse supernovae
• Footprints of the Newly-Discovered Vela Supernova in Antarctic Ice Cores?
• Probing r-Process Production of Nuclei Beyond Bi209 with Gamma Rays
• SRG/eROSITA and XMM-Newton observations of Vela Jr
• Search for broad absorption lines in spectra of stars in the field of supernova remnant RX J0852.0-4622 (Vela Jr.)