binney merrifield galactic astronomy pdf

The widths of spiral arms increase with distance from the Galactic center. These measurements provide strong evidence for the existence of spiral arms in the Milky Way, accurately locating many arm segments and yielding spiral pitch angles ranging from about 7° to 20°. Over 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured with the Bar and Spiral Structure Legacy Survey, a Very Long Baseline Array key science project, the European VLBI Network, and the Japanese VLBI Exploration of Radio Astrometry project. Over 1/3 the Celestial sphere in five bands and obtained over five million Since its first light in 1998, SDSS has imaged Sloan Exploration of Galactic Understanding and Evolution 2 (SEGUE-2) survey Ģ,497,484 BOSS spectra of 1,372,737 galaxies, 294,512 quasars, and 247,216 deg of ugriz imaging 155,520 spectra of 138,099 stars as part of the The APOGEE outputs now include measuredĪbundances of 15 different elements for each star. Velocity measurements of 5500 stars from the Multi-Object APO Radial VelocityĮxoplanet Large-area Survey (MARVELS). Galactic Evolution Experiment (APOGEE), and includes repeated accurate radial Number of H-band spectra of stars as part of the Apache Point Observatory (APO) Survey (BOSS) over an additional 3000 sq. Spectra of galaxies and quasars from the Baryon Oscillation Spectroscopic Relative to our previous public release (DR10), DR12 adds one million new

Included in previous data releases), marking the end of SDSS-III observing. Release 12 (DR12) adding data acquired through 2014 July (including all data Release 11 (DR11) including all data acquired through 2013 July, and Data All the dataįrom SDSS-III are now made public.

High-resolution spectrograph, and a novel optical interferometer. The third generation of the Sloan Digital Sky Survey (SDSS-III) took dataįrom 2008 to 2014 using the original SDSS wide-field imager, the original andĪn upgraded multi-object fiber-fed optical spectrograph, a new near-infrared

Binney merrifield galactic astronomy pdf