Astronomy Papers That Caught My Eye In Today's arXiv
There are 59 papers today (Wednesday), not counting replacements. There were quite a few papers on the slowing of the rotation of magnetars.
Topics: Metalicity & SN at z=1.49, Nova Ejecta, Making a Star ClusterMetalicity & SN at z-1.49 http://arxiv.org/abs/1503.08822
Galaxies seem to have started out getting lots of metals in their cores and more slowly spreading that higher metal/Hydrogen ratio to the outer spiral arms over time. This is pretty difficult to measure at the moment. Bright light sources where we can see absorption lines are needed, but at z>1 not much is bright. Someday the E-ELT and similar telescopes will be able to just look and see supernovae at such distances, but for now, we have to wait for rare lensed supernovae, and this paper is about one such SN, and the galactocentric metalicity gradient for one face-on spiral galaxy at z=1.49.Nova Ejecta http://arxiv.org/abs/1503.08840
Recurrent Nova T Pyxidis was observed erupting six times since 1890 and probably erupted once around 1866, but that 1866 eruption may have been the first, or at least the first after millenia of being quiet. We know this because when it erupted in 2011, Hubble was used periodically to check on how the light from that eruption reionized knots of material from the previous eruptions. This paper tells the story, and shows the images of the light echos.Making a Star Cluster http://arxiv.org/abs/1503.09037
S254-S258 OB Complex is a large infrared dark cloud with interior filaments about 8000 light years from here. It contains many protostars and young stellar objects., and is showing us what an open cluster looks like before it is done being made. From this example we can see one instance of how efficient and rapid the process of forming stars is. It is currently forming about 30 solar masses of stars every million years.