SDSS-III at the American Astronomical Society meeting in Long Beach

8 01 2013

The SDSS-III is at the 221st meeting of the American Astronomical Society. We have a number of talks and posters at this year’s meeting, including a special Thursday 10am morning session (Session 402, Room 102C) on the latest results from studying matter along the path to distant quasars.

LGB_Convention_Center

If you’re at the meeting please stop by and say hi. You could meet people like Jordan Raddick, SDSS-III education and public outreach and press officer; Peter Frinchaboy, key player in the APOGEE survey; or David Schlegel, principal investigator of the BOSS survey. They may not always be standing left-to-right as pictured below, but you can also learn about the latest results from APOGEE that they’re discussing displayed on the left.

AAS221_SDSS-III_booth_500





BOSS Survey and Plug Plate Featured in January 2013 National Geographic

4 01 2013

The SDSS-III BOSS survey is highlighted in this month’s 125th anniversary issue of National Geographic. This news update features a dramatic image of one of the 1000-hole SDSS-III plates used to place the fiber optic cables. Each fiber optic cable carries the light of a target in the sky to the BOSS spectrograph where its light is split apart to identify the nature of distant galaxies and quasars and how much the Universe has expanded since that light was emitted.





ACT+BOSS Kinetic SZ Effect a Top 10 Breakthrough of 2012

18 12 2012

A paper published this year in Physical Review Letters (2012, 109, 041101), Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel’dovich Effect, represented a joint collaboration between the Atacama Cosmology Telescope and the SDSS-III BOSS survey. This work presented the first detection of the kinetic Sunyaev-Zeldovich effect.

This paper has just been recognized by Physics World as one of the Top 10 Breakthroughs of 2012:

http://physicsworld.com/cws/article/news/2012/dec/14/physics-world-reveals-its-top-10-breakthroughs-for-2012





APOGEE Sets Record of 54,000 High-Resolution Infrared Spectra in Two Months

12 12 2012

The APOGEE survey had stupendously productive October and November bright runs[*] with 206 plates successfully observed. This achievement is a great credit to the Apache Point Observatory mountain observing and engineering staff, who worked hard to complete these observations while simultaneously performing system maintenance and validation. Thanks to their efforts 107 plates were observed during the October bright run and 99 during the November bright run. This total of 206 observations included multiple observations of 120 unique plates covering 87 different fields on the sky, for a total of 54,000 new spectra of over 23,000 stars, including 11,000 previously unobserved stars.

The APOGEE survey is currently on pace to finish its goal of observing 100,000 stars by the end of the SDSS-III survey in 2014.Those interested in the future of APOGEE and the Sloan Foundation 2.5-m Telescope after SDSS-III are invited to read about the plans for a trio of surveys that will study our own galaxy and beyond


http://www.sdss3.org/future

[*] A “bright run” is the time the moon is bright in the sky, roughly from one week before full moon through one week after new moon. The moon makes the background sky much brighter in visual wavelengths (note how many more stars you can see with your eyes when the moon is below the horizon compared to the night of a full moon). But the additional brightness of the moon is much less important in the infrared, so infrared observations are generally scheduled for times the moon is up, while visual-wavelength observations, such as those of the BOSS survey, are scheduled for times when the moon is below the horizon or only partially illuminated from our perspective on Earth.





BOSS Detects Baryon Acoustic Oscillations in the Lyman-alpha Forest at z of 2.3.

13 11 2012

SDSS-III astronomers announce today the first detection of BAO in the Lyman-alpha forest 11 billion years ago. The paper has been submitted to Astronomy & Astrophysics and is available on arXiv:

“Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars”
N. Busca et al.
Submitted to Astronomy & Astrophysics

http://arxiv.org/abs/1211.2616


The new BOSS Lyman-alpha measurement of H(z)/(1+z) is illustrated by the red dot.


The Lyman-alpha forest is detected through the imprint of hydrogen cloud absorpt
ion lines on the light from background quasars.

For more details see today’s press release at


http://www.sdss3.org/press/lyabao.php





DR9 BOSS Galaxy Clustering Ancillary Data Now Available

16 10 2012

The SDSS-III BOSS Galaxy Clustering Working Group has collected its primary DR9 science results and ancillary data and made them available to the public on the SDSS-III public web site. The goal is to provide sufficient information for the wider astronomical community to recreate and perhaps even improve these analyses. At
http://www.sdss3.org/science/boss_publications.php
, one can find the following data products:

* Tabulated correlation function measurements and power spectrum measurements, both pre- and post-reconstruction, used in the detection of the BAO feature in Anderson et al. Covariance matrices for all measurements are included as well.
* Tabulated correlation function measurements and errors from the analysis of the full shape of the CMASS clustering signal from Sanchez et al.
* Tabulated measurements and covariance matrices for the redshift-space multipoles of the CMASS correlation function, from Reid et al and Samushia et al. A software package to compute the theoretical correlation functions is also linked to from the public SDSS-III SVN.
* CosmoMC modules that allow users to incorporate the BAO detection and the theoretical analyses of the redshift-space multipoles into CosmoMC Markov chains.
* Tabulated results from the enhanced redshift distortions analysis of Tojeiro et al.
* Small-scale correlation functions, both redshift-space and projected, and errors from Nuza et al.

At this web page, we also include high-quality figures from these papers that we encourage people to include in presentations that incorporate BOSS results. Questions about the files should be directed at the corresponding author of the paper from which the measurements came.

1) Anderson et al:
“The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample”

http://arxiv.org/abs/1203.6594

2) Reid et al:
“The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z=0.57 from anisotropic clustering”

http://arxiv.org/abs/1203.6641

3) Sanchez et al:
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the large-scale two-point correlation function

http://arxiv.org/abs/1203.6616

4) Nuza et al:
“The clustering of galaxies at z~0.5 in the SDSS-III Data Release 9 BOSS-CMASS sample: a test for the LCDM cosmology”

http://arxiv.org/abs/1202.6057

5) Manera et al:
“The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: a large sample of mock galaxy catalogues”

http://arxiv.org/abs/1203.6609

6) Samushia et al:
“The Clustering of Galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Testing Deviations from Lambda and General Relativity using anisotropic clustering of galaxies”

http://arxiv.org/abs/1206.5309

7) Tojeiro et al:
“The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measuring structure growth using passive galaxies”

http://arxiv.org/abs/1203.6565





Gone with the wind: new study finds quasars that change quickly

1 10 2012

A new SDSS press release is up! This time, we’re featuring work led by Nurten Filiz Ak of Penn State, studying disappearing broad absorption line troughs in quasars. They have found several quasars in which the BAL trough disappears over a nine-year period. The simplest explanation for this observation is that as the quasar’s accretion disk has rotated, carrying the absorption region out of the line of sight between us and the quasar. In other words, as the press release says, the gas cloud is…

Gone, with the Wind

A glowing red-orange disk surrounding a small black dot, with thick blue lines radiating out from the center. An inset on 	the top left shows two SDSS spectra, which appear as wavy red and blue lines.

An artist’s impression of a quasar, along with its spectra from SDSS observations








Follow

Get every new post delivered to your Inbox.

Join 33 other followers