Apache Point Observatory Galactic Evolution Experiment
Encyclopedia
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is an astronomical survey established to study 100,000 red giant
stars encompassing the entire galactic bulge, bar, disk, and halo
. It will use high-resolution, high signal-to-noise infrared spectroscopy
. This will be used in order to penetrate the dust
obsuring the inner galaxy.
This survey is one of four components of SDSS-III.
Red giant
A red giant is a luminous giant star of low or intermediate mass in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius immense and the surface temperature low, somewhere from 5,000 K and lower...
stars encompassing the entire galactic bulge, bar, disk, and halo
Galactic halo
The term galactic halo is used to denote an extended, roughly spherical component of a galaxy, which extends beyond the main, visible component. It can refer to any of several distinct components which share these properties:* the galactic spheroid...
. It will use high-resolution, high signal-to-noise infrared spectroscopy
Infrared spectroscopy
Infrared spectroscopy is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light. It covers a range of techniques, mostly based on absorption spectroscopy. As with all spectroscopic...
. This will be used in order to penetrate the dust
Cosmic dust
Cosmic dust is a type of dust composed of particles in space which are a few molecules to 0.1 µm in size. Cosmic dust can be further distinguished by its astronomical location; for example: intergalactic dust, interstellar dust, interplanetary dust and circumplanetary dust .In our own Solar...
obsuring the inner galaxy.
This survey is one of four components of SDSS-III.
See also
The other components of SDSS-III are:- Baryon Oscillation Spectroscopic SurveyBaryon Oscillation Spectroscopic SurveyThe Baryon Oscillation Spectroscopic Survey is an astronomical survey designed to measure the expansion rate of the Universe.It will focus on luminous red galaxies and quasars, mapping the spatial distribution....
(BOSS) - Multi-object APO Radial Velocity Exoplanet Large-area SurveyMulti-object APO Radial Velocity Exoplanet Large-area SurveyThe Multi-object APO Radial Velocity Exoplanet Large-area Survey ' is a ground-based Doppler survey of 11,000 of the brightest stars. The project will use the SDSS telescope and new multi-object Doppler instruments to monitor radial velocities...
(MARVELS) - Sloan Extension for Galactic Understanding and Exploration 2Sloan Extension for Galactic Understanding and Exploration 2The Sloan Extension for Galactic Understanding and Exploration 2 is an astronomical survey designed to map the outer reaches of the Milky Way with a spectra of 240,000 stars...
(SEGUE-2)