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The Top 12 of 2012

2. Constraining Dark Energy at high redshifts

Why it is important: Dark energy is still almost as mysterious as it was in its Nobel-prize winning discovery in 1998. These observations help tighten constraints on one of the things we most want to know– how does dark energy now compare to dark energy in the early universe?

This paper presents an updated sample of type Ia supernovae, including ten at z > 1. Here, the authors show that the current constraints from these supernovae, the CMB, and Baryon Acoustic Oscillations (see #4) are still consistent (contours) with Einstein’s model of a cosmological constant (w0 = -1, x-axis) which does not vary with time (wa = 0, y-axis). (Adapted from Figure 6 of Suzuki et al.).

Next: (#1) So Many Gamma Rays, So Little Time: The Best and Biggest Look at the Gamma-ray Sky (So Far)

Previous: (#3) We are Small, but We are Many! Kepler Measures an Increasing Frequency of Small Planets

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I am a 22nd-grader at UCLA, working with Mark Morris and spending the year at the MPIA in Heidelberg finishing my thesis. I like molecules in space, radio telescopes, the extreme center of our galaxy, getting to look at things no-one else has ever seen before, solving puzzles, and finding creative ways to survive graduate school

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Discussion

6 Responses to “The Top 12 of 2012”

  1. Hi Betsy:

    Just a note– it looks like the arXiv link that you have on the first page of this article does not link to the title you provide.

    The link looks like it goes here:

    http://arxiv.org/abs/1106.0499

    “How supernova feedback turns dark matter cusps into cores”

    instead of here:

    http://arxiv.org/abs/1107.1261

    “Keck Spectroscopy of Faint 3<z<8 Lyman Break Galaxies:- Evidence for a Declining Fraction of Emission Line Sources In the Redshift Range 6<z<8"

    Thanks,
    Dave

    Posted by Dave Coulter | February 20, 2013, 5:14 pm
  2. Fascinating articles! But counting citations seriously distorts what astronomy is about. Because most young astronomers today work in observational cosmology, 10/12 papers are on that topic, the most glamorous frontier. But 10/12 of the most significant new papers of 2012 (selected some other way) paint a certainly much broader canvas, and reflect the amazing scope of astronomical research!
    Only the search for new planets (another glamour topic) and new calculations of the evolution of rotating stars in the HR diagram (a classic issue in stellar astronomy) penetrated the top twelve. So much more was missing!
    Nonetheless, an interesting citation poll.

    Posted by Donald D Clayton | February 20, 2013, 7:39 pm
  3. Hi, I think the mass-to-light ratio of a low-mass star is higher than that of a high-mass star. In addition, the Salpeter IMF has more low-mass stars than the Kroupa and Chabrier IMFs.

    I think that the article in astrobites has more detail introduction:
    http://astrobites.com/2012/02/16/the-imf-is-not-universal/

    Posted by Song, Wang | February 20, 2013, 9:05 pm

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