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BOSS Reaches Observing Milestone: 500,000 galaxies + 100,000 quasars

23 Nov 2011, 19:18 UTC
BOSS Reaches Observing Milestone: 500,000 galaxies + 100,000 quasars
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The SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) has just passed the milestone of observing 500,000 galaxies and 100,000 quasars. By the completion of the survey in 2014, BOSS will have observed 1.5 million galaxies and 250,000 quasars as it maps out the distribution of matter in the Universe and measures the properties of dark energy.

The first image, courtesy of Kyle Dawson (Utah), shows the BOSS coverage on the sky (right ascension and declination) of the current survey (red). The planned total coverage is shown in grey, and we’ve already drilled the plates for all of the tiles in blue.

The second image, courtesy of Michael Blanton (NYU), shows the redshift and right ascension coverage of the BOSS survey to date. While there are many more galaxies in the Universe beyond a redshift of 0.7, BOSS is focusing on galaxies between now and 6.5 billion years ago (redshift of 0.7, shown in white) when dark energy was just starting to have a noticeable effect. The red and yellow dots are the galaxies from the previous SDSS I/II surveys and show by contrast how much more of the Universe SDSS-III BOSS is exploring. The BOSS quasars, shown in cyan, probe the ...

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