Type 1a Supernoave: A Non-Standard Candle

Type 1a Supernoave: A Non-Standard Candle

One of the most exciting discoveries of astronomy in recent years was the measurement of an acceleration term in the universe’s rate of expansion. Announced by both the Supernova Cosmology Project at the Lawrence Berkeley National Laboratory and the High-z Supernova Search Team, these results at once confirmed one another an revolutionized how astronomers view the universe. This discovery meant, quite simply, that our universe will expand forever, tearing itself apart and ever increasing rates. Someday, the expansion of space will carry everything we are not gravitationally attached to so far away so fast that the light will get red-shifted beyond all easy (and perhaps even all possible) reach. (image credit: NASA, ESA, CXC, JPL-Caltech, J. Hester and A....

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Scientific Dialogue by Journal Article: Coffee maybe required

Today I had two juxtapositions of journal articles. On one hand I had the photo-ready proofs of a journal article on the Astronomy Cast listener survey I submitted to, and had accepted by CAP. On the other hand I had a bunch of journal articles my student was working on data mining for our research (those articles are on the evolution of galaxies in clusters). I have to admit, my own journal article (which I’ll post links to once it is online), would put me to sleep – it is a dry recitation of facts, figures, numbers and a couple charts. Everything is quantified and potential errors are noted. If you want to replicate my analysis, almost everything you need is there, and the only stuff missing is the exact words folks wrote in the fill in the blank...

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Seyfert’s Sextet, Stephan’s Quintet, and Compact Groups

Seyfert’s Sextet, Stephan’s Quintet, and Compact Groups

This morning I was flipping digitally through the preprints on arXiv, and I stumbled on a rich paper on the evolution of Seyfert’s Sextet. In the paper, they discuss Seyfert’s Sextet as a more evolved version of Stephan’s Quintet. Now, these two compact galaxy groups (CGG) are two of my favorite objects to image, so I couldn’t resist pausing to read the article. But I have to admit that I had to do a bit of googling first. This is because Seyfert’s Sextet doesn’t have 6 member galaxies, and Stephan’s Quintet doesn’t have 5 member galaxies. And while I didn’t remember just how many the two of them had, I knew the answer was attached to the captions of the two pretty pictures above. So, here’s the...

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