نتایج جستجو برای: leigh disease
تعداد نتایج: 1491454 فیلتر نتایج به سال:
Identifying the progenitors of Type Ib and Type Ic supernovae requires knowing, among other things, whether SNe Ib eject hydrogen, and whether SNe Ic eject helium, and perhaps even hydrogen. Recently it has become clear that some SNe Ib do eject hydrogen, and it may be that all SNe Ib do. Two arguments that have been made in the past that SNe Ic eject helium are difficult to confirm, but I disc...
We report on the optical recovery of SN 1986E 7.1 and 7.9 years after explosion. The spectra are dominated by broad H and O I] 6300,6364 emission lines with a minor contribution from Ca II] 7291,7324 and, possibly, Fe II] 7155. Compared with the spectra of the other recovered SNII, SN1986E shows strong H luminosity similar to SN 1979C but, in contrast, weak O III] emission. So far, among classi...
Type Ia supernovae (SNe Ia) are not perfectly homogeneous. There are peculiar ones: SN 1991T-like (overluminous), SN 1986G-like (subluminous), and SN 1991bg-like (very subluminous) objects. Figure 1 shows a comparison of the spectra of peculiar SNe Ia with that of a relatively normal SN Ia, SN 1994D. The peculiarity rate, however, is not well established. An estimate (less than 10%) by Branch e...
On the basis of the current observational evidence, we put forward the case that the merger of two CO white dwarfs produces both a Type Ia supernova explosion and a stellar remnant, the latter in the form of a magnetar. The estimated occurrence rates raise the possibility that many, if not most, SNe Ia might result from white dwarf mergers.
The abundance of the subarctic copepod, Calanus finmarchicus, and temperate, shelf copepod, Centropages typicus, was estimated from samples collected bi-monthly over the Northeast U.S. continental shelf (NEUS) from 1977-2010. Latitudinal variation in long term trends and seasonal patterns for the two copepod species were examined for four sub-regions: the Gulf of Maine (GOM), Georges Bank (GB),...
We present the rst measurement of the rate of Type Ia supernovae at high redshift. The result is derived using a large subset of data from the Supernova Cosmology Project. Three supernovae were discovered in a surveyed area of 1.7 square degrees. The survey spanned a 3 week baseline and used images with 3 limiting magnitude of R 23. We present our methods for estimating the numbers of galaxies ...
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