MaNGA Pre-Survey Review and Team Meeting in Portsmouth, UK

23 01 2014

Around 45 astronomers have been in Portsmouth, England this week attending the MaNGA Pre-Survey Review and Team Meeting.

MaNGA  (Mapping Nearby Galaxies at APO) is part of the plans for the next phase of the Sloan Digital Sky Survey (along with eBOSS and APOGEE2) due to start in July of this year.

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The MaNGA Team and Review Panel in front of the Institute of Cosmology and Gravitation at the University of Portsmouth. Image Credit: Edd Edmondson

As well as the full science program, the astronomers have been enjoying the British pubs, Indian Food, and historic Naval ships to be found in Portsmouth.

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The MaNGA Team enjoyed a special tour of HMS Warrior 1860 in the Portsmouth Historic Dockyard. Here shown just before sunset on Wednesday. Image Credit: Karen Masters

The MaNGA Team are happy with the outcome of the review, and it’s full speed ahead to survey operations. The discussions continue today and tomorrow with open issues and plans for early science papers.





We’ll always have Paris

21 09 2010

Blog by David Weinberg (SDSS-III Project Scientist)

One-hundred and thirty scientists from four continents gathered in Paris for the second annual meeting of the SDSS-III collaboration, hosted by the laboratoire AstroParticule et Cosmologie (APC).

Paris 2010 continues a tradition that began in 1994, with the first SDSS collaboration meeting at Yerkes Observatory. Early collaboration meetings were filled with discussions of hardware, data pipelines, target selection, and survey strategy. Over the years, as the SDSS steadily accumulated the largest data sets in the history of astronomy, the proceedings shifted more and more towards scientific discoveries, about the large scale structure of the universe, the evolution of galaxies and quasars, the history of the Milky Way, the physics of stars, and the genealogy of asteroid families (see the highlights summaryat sdss.org). The sequence of SDSS-I and SDSS-II collaboration meetings culminated in 2008 with an international symposium that celebrated the scientific achievements and influence of the SDSS.

SDSS-III involves four new surveys, two new instruments, major upgrades to the original SDSS spectrographs and the fiber system that supports them, and many new participating institutions and scientists. The first SDSS-III collaboration meeting (Princeton, 2009) was in many ways a return to the early days, focused again on hardware, software, survey strategy, and organization of science teams.

One year along, Paris 2010 shows a project in transition, or, more precisely, four projects at four different transitions. Talks about nearly complete analyses of the chemistry and kinematics of the Galactic disks in SEGUE-2 and the aridity of the brown dwarf desert in MARVELS alternated with talks describing first measurements from the BOSS galaxy and Lyman-alpha forest surveys and the rapid progress of the APOGEE infrared spectrograph toward its commissioning in early 2011. After a day and a half of plenary sessions, the meeting split into another day and half of survey-specific parallel sessions, where team members dug into details of the science analyses, reviews of target selection efficiency, theoretical predictions and mock catalogs, and the nitty-gritty of signal-to-noise thresholds, sky coverage, and plate scheduling algorithms.

While the days started early and ran late, everyone also took the opportunity to enjoy the delights of Paris, guided expertly by LOC Chair Eric Aubourg. Highlights included the conference dinner cruise along the Seine and “wine lover’s lunches” at a small restaurant near the APC. It was asserted more than once that attending a wine lover’s lunch would improve one’s afternoon talk. This attractive hypothesis was not rigorously tested, though anecdotal evidence did not prove it obviously false.

Twenty years after the SDSS was conceived, it remains an exciting project at the cutting edge of observational astronomy, and it continues to demand the efforts, talents, and insights of a large collaboration. The collaboration meetings are intense, and they are fun.

Plus ca change, plus c’est la meme chose.





SDSS3 collaboration visits Pittsburgh

5 07 2010

Thirty members of the BOSS Lyman-alpha Forest and Quasar Working Groups met for a workshop in Pittsburgh from Jun 21-24 , hosted by the McWilliams Center for Cosmology at Carnegie Mellon University.

The Working Groups comprise those survey members most interested in high redshift quasars and the intergalactic medium. The quasar spectra collected by the survey act as backlights, illuminating the intergalactic gas. This gas causes absorption features in the spectra (mostly the hydrogen Lyman-alpha “forest”) and by analyzing the spectra we can measure the large scale structure of intergalactic material. The prime aim of the survey is to see this structure on scales many times larger than any previous Lyman-alpha forest survey, and use the presence of the baryon oscillation feature to constrain dark energy.

The accumulation of this vast new dataset, will make many other science projects be possible, from measurements of faint quasar black hole clustering to the searches for faint traces of rare chemical elements in intergalactic space. The Pittsburgh meeting was partly dedicated to exploring these different possibilities.

BOSS Survey Scientist Kyle Dawson started the meeting off with a summary of what has been a successful first year of survey operations. There are nearly as many quasar spectra in the interesting redshift range to analyze than all previous surveys put together, and there are still 5 years of data to come.

Questions of survey strategy came up, and in particular how the signal to noise reached so far in spectra will translate into cosmological constraints. Here David Weinberg leads a discussion on how well the survey is doing.

Preliminary results from first year data were presented in many of the talks. Here Jordi Miralda-Escude reports on measurements of large-scale structure in the intergalactic medium made by the survey.

Members of the French Participation Group were heavily represented. Their team is examining every single of the tens of thousands of quasar target spectra by eye. Christophe Yeche and Isabelle Paris seen here with conference co-organizer Nic Ross show that they must be enjoying it.

Whether the SDSS3 logo looks better on an ipad was also an interesting issue for some people.

With 30 talks and working group sessions spread over 4 days, it was useful to be able continue serious discussion at a Pittsburgh landmark, the Church Brew Works:








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