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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>APOGEE: Probing the Evolution of the Milky Way - SDSS-III</title> <base href="https://www.sdss3.org/" /> <link href="images/sdss3.ico" rel="icon" type="image/x-icon" /> <link href="images/sdss3.ico" rel="shortcut icon" type="image/x-icon" /> <link href="css/styles_inner.css" rel="stylesheet" type="text/css" /> <link href="css/styles.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="js/sdss3lib.js"></script> </head> <body> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-51460428-1', 'sdss3.org'); ga('send', 'pageview'); </script> <div class="header"> <form action="search.php" method="post"><p><label for="inputq">Search </label><input type="text" name="q" id="inputq" maxlength="256" size="7" /></p></form> <p><a href="sitemap.php">Site Map</a></p> </div> <div class="navbar" id="topnav"> <ul> <li><a href="index.php">Home</a></li> <li><a class="highlight" href="surveys/">Surveys</a></li> <li><a href="science/">Results</a></li> <li><a href="instruments/">Instruments</a></li> <li><a href="http://www.sdss.org/data/">Data Releases</a> <ul> <li><a href="dr18/">DR18</a></li> <li><a href="dr17/">DR17</a></li> <li><a href="dr16/">DR16</a></li> <li><a href="dr15/">DR15</a></li> <li><a href="dr14/">DR14</a></li> <li><a href="http://www.sdss.org/dr13/">DR13 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://www.sdss.org/dr12/">DR12 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://www.sdss.org/dr11/">DR11 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="dr10/">DR10</a></li> <li><a href="dr9/">DR9</a></li> <li><a href="dr8/">DR8</a></li> <li><a href="http://classic.sdss.org/dr7/">DR7 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr6/">DR6 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr5/">DR5 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr4/">DR4 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr3/">DR3 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr2/">DR2 <img src="images/offsite.png" alt="[EXT]" /></a></li> <li><a href="http://classic.sdss.org/dr1/">DR1 <img src="images/offsite.png" alt="[EXT]" /></a></li> </ul></li> <li><a href="education/">Education</a></li> <li><a href="collaboration/">Collaboration</a></li> <li><a href="future/">Future</a></li> <li><a href="contact.php">Contact</a></li> </ul> </div> <div class="main_container"> <div class="leftnav"> <ul> <li><a href="surveys/">Surveys</a></li> <li><a href="surveys/boss.php">BOSS</a></li> <li><a href="surveys/segue2.php">SEGUE-2</a></li> <li><a class="highlight" href="surveys/apogee.php">APOGEE</a></li> <li><a href="surveys/marvels.php">MARVELS</a></li> </ul> </div> <div class="right_content"> <h1 id="Top">APOGEE: Probing the Evolution of the Milky Way</h1> <p>The APO Galactic Evolution Experiment (APOGEE) is using high-resolution, high signal-to-noise infrared spectroscopy to penetrate the dust that obscures significant fractions of the disk and bulge of our Galaxy. APOGEE will survey over 100,000 red giant stars across the full range of the Galactic bulge, bar, disk, and halo. Precise radial velocities and detailed chemical abundance "fingerprinting" will provide unprecedented insights into the dynamical structure and chemical history of the Galaxy. APOGEE will also contribute to unraveling problems in fundamental astrophysics, and complement other major surveys such as Kepler and CoRoT.</p> <p>The SEGUE-2 and APOGEE datasets will play a central role in near-field cosmology tests of galaxy formation and the small-scale distribution of dark matter.</p> <table class="centerfigure"> <tr><td><img src="images/apogee/2mass2.jpg" alt="2MASS image of the Milky Way" /></td></tr> <tr><td>IR map of the whole Galaxy showing the plane and bulge of the Galaxy full of stars and dust. APOGEE uses new IR instrumentation to study stars within the disk and is less affected by the extinction from interstellar dust.</td></tr> </table> <table class="common"> <tr><th>APOGEE at a glance</th></tr> <tr><td>Bright time observations</td></tr> <tr><td>Spring 2011 - Spring 2014</td></tr> <tr><td>100,000 giant stars to magnitude H=12.2</td></tr> <tr><td>Resolution R~22,500, typical S/N > 100</td></tr> <tr><td>Wavelengths 1.51-1.70 μm</td></tr> <tr><td>Stellar parameters including log(g), T<sub>eff</sub>, [Fe/H], [α/Fe]</td></tr> <tr><td>Abundance of 15 chemical species to 0.1 dex precision </td></tr> <tr><td>Velocity error < 100 m/s</td></tr> </table> <p>For a detailed description of APOGEE, see section 5 of the <a href="collaboration/description.pdf">Project Description</a>, available as a PDF document.</p> <h3>Working with APOGEE data</h3> <p> <a href="dr10/">Data Release 10</a> represents the first public release of APOGEE spectra. </p> <ul> <li>There are some <a href="dr10/tutorials/">basic tutorials</a> for accessing and viewing SDSS data.</li> <li>There are descriptions of the <a href="dr10/irspec/targets.php">target selection</a> for APOGEE stars.</li> </ul> <h3>APOGEE papers</h3> <p> APOGEE has submitted and/or published several papers which are listed on the <a href="science/apogee_publications.php">APOGEE Publications page</a>. </p> <p class="footer">Copyright © 2010-2013 SDSS-III</p> <table class="footer"><tr><td id="fileft"> </td><td id="firight"> </td></tr></table> </div> </div> </body> </html>