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Stellar Magnetic Fields
On Feb 24, 7:44*am, Phillip Helbig---undress to reply
....the paper you mentioned provides NO EVIDENCE WHATSOEVER that there might be an ultracompact object in the remnant of Tycho's supernova. Well, the paper models the weak gamma-ray flux in terms of a point source located approximately at the center of the SNR. However, it is true that at this point the resolution is not sufficient to say much about the morphology of the source, or its exact location. Let's stay calm and let nature answer the question. Note that for SN 1006, another type-I SN, there are two gamma-ray hotspots symmetrically located on opposite sides of the expanding shell [this is referenced in the Tycho's SN paper]. One possible explanation is that twin hadronic and/or leptonic jets coming from a central ultracompact object are exciting this emission. Purely conjecture at this point, but SN 1006 is clearly another fascinating system to watch regarding the definitive prediction of this thread. Both Tycho's SN and SN 1006 are relatively nearby type-I SN remnants. They probably represent the best available test systems for evaluating the prediction, other than a brand new local SN-I event. I look forward to further developments as these systems are investigated with greater detail at various wavelengths. RLO www.amherst.edu/~rloldershaw [Mod. note: for SN1006, have a look at the X-ray emission: the X-rays are clearly non-thermal emission from the rim of the SNR, and the TeV gamma-rays are completely consistent with being inverse-Compton emission from the electrons responsible for the X-rays (this is a required process). See e.g. http://www.mpi-hd.mpg.de/hfm/HESS/pa...e/som/2008/08/ for pictures. No evidence for jets here, and I write as a big fan of jets -- mjh] |
#32
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Stellar Magnetic Fields
"Recent observations have revealed that many nearby GRBs are
associated with core-collapse SNe. ... The observed GRB-connected SNe are all Type Ic SNe." That's Type I, mind you. http://arxiv.org/PS_cache/arxiv/pdf/...104.0754v1.pdf Now, what typically produces a GRB? RLO http://www3.amherst.edu/~rloldershaw Discrete Scale Relativity |
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