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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>The Scope of DR9 - 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" /> <link href="css/dr9.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 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 class="highlight" 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="navbar" id="midnav_older"> <ul> <li><a href="dr9/whatsnew.php">What's New?</a></li> <li><a class="highlight" href="dr9/scope.php">Scope</a></li> <li><a href="dr9/data_access/">Data Access</a></li> <li><a href="dr9/imaging/">Imaging</a></li> <li><a href="dr9/spectro/">Optical Spectra</a></li> <li><a href="dr9/algorithms/">Algorithms</a></li> <li><a href="dr9/software/">Software</a></li> <li><a href="dr9/help/">Help</a></li> <li><a href="dr9/tutorials/">Tutorials</a></li> </ul> <p>This document describes <span class="i">Data Release 9</span>. The latest data release is <a href="http://www.sdss.org/dr18/">Data Release 18</a>.</p> </div> <div class="main_container"> <div class="leftnav"> </div> <div class="right_content"> <h1 id="Top">The Scope of DR9</h1> <div class="summary"> <p>Data Release 9 (DR9), made publicly available in July 2012, contains the full imaging survey from the SDSS imaging camera, all of the SDSS 640-fiber spectrograph data from DR8, plus 831,000 new spectra from the new BOSS 1000-fiber spectrograph.</p> </div> <p>A <a href="science/dr9.pdf">paper</a> accompanies the data release which details the differences between DR9 and its predecessors. Major differences from the <a href="http://www.sdss3.org/dr8">DR8</a> release are: </p> <ol> <li> Updates to the astrometric positions and proper motions in the imaging.</li> <li> New stellar parameters for SDSS spectrograph data</li> <li> 831,000 new spectra from the BOSS spectrograph data</li> </ol> <p id="covercheck">To check whether a location is covered in DR9 please use the form below. Enter RA/Dec coordinates in the box, in decimal degrees, and click Submit. Your coordinates will be loaded into the <a href="http://dr9.sdss3.org">DR9 Science Archive Server (SAS)</a>. If your point is in the DR9 survey area, results will include links to all available SDSS imaging and spectroscopic data.</p> <form action="http://dr9.sdss3.org/coverageCheck/search" method="post"> <table class="centerfigure" style="width:50%;"> <tr> <td style="text-align:center;">RA/Dec <br />Coverage Check:</td> <td style="text-align:center;"> <textarea name="radecs" cols="25" rows="1">180.00 50.00</textarea> </td> <td style="text-align:center;"> <input type="submit" name="submit" value="Submit" /> </td> </tr> </table> </form> <table class="centerfigure" id="covermap"> <tr><td><a href="images/dr9_spectro_coverage.png"><img src="images/dr9_spectro_coverage.thumb.png" alt="DR9 spectroscopic coverage" /></a></td></tr> <tr><td>DR9 imaging and spectroscopic coverage in Equatorial coordinates (plot centered at RA = 6h, or 90 deg.)</td></tr> </table> <p>The data is defined as a set of photometric <a href="dr9/help/glossary.php#run">runs</a> and a set of spectroscopic <a href="dr9/help/glossary.php#plate">plates</a> (see the basics on <a href="dr9/imaging/imaging_basics.php">imaging</a> and <a href="dr9/spectro/spectro_basics.php">spectroscopy</a>). We provide links here to ASCII and FITS lists of the runs and the plates. These lists are essentially a summary of all of the data in the data release.</p> <ul> <li> List of runs: <a href="http://data.sdss3.org/sas/dr9/boss/photoObj/photoRunAll-dr9.par">photoRunAll-dr9.par</a>, <a href="http://data.sdss3.org/sas/dr9/boss/photoObj/photoRunAll-dr9.fits">photoRunAll-dr9.fits</a></li> <li> List of plates: <a href="http://data.sdss3.org/sas/dr9/sdss/spectro/redux/plates-dr9.par">plates-dr9.par</a>, <a href="http://data.sdss3.org/sas/dr9/sdss/spectro/redux/plates-dr9.fits">plates-dr9.fits</a></li> </ul> <p>SDSS-III has committed to publicly release its raw and reduced data sets. We are doing so using the <i>Catalog Archive Server</i> for retrieval of catalog data from a powerful SQL database and a <i>Science Archive Server</i> for retrieval of calibrated spectra and images. </p> <h2 id="imagestats">Imaging data statistics</h2> <table class="common"> <tr> <td>Total unique area covered</td> <td>14,555 square degrees</td> </tr> <tr> <td>Total area of imaging (including overlaps)</td> <td>31,637 square degrees (excluding supernovae runs)</td> </tr> <tr> <td>Individual image field size</td> <td>1361x2048 pixels (0.0337 square degrees)</td> </tr> <tr> <td>Number of individual fields</td> <td>938,046 (excluding supernovae runs)</td> </tr> <tr> <td>Number of catalog objects</td> <td>1,231,051,050</td> </tr> <tr> <td>Number of unique detections</td> <td>932,891,133</td> </tr> <tr> <td>Number of <a href="dr9/algorithms/resolve.php">unique, primary</a> sources </td> <td> <table class="noborder"> <tr><td>Total</td><td style="text-align:right;">469,053,874</td></tr> <tr><td>Stars</td><td style="text-align:right;">260,562,744</td></tr> <tr><td>Galaxies</td><td style="text-align:right;">208,478,448</td></tr> <tr><td>Unknown</td><td style="text-align:right;">12,682</td></tr> </table> </td> </tr> <tr> <td>Effective wavelengths and magnitude limits<br /> (95% completeness for point sources)</td> <td> <table class="noborder" style="text-align:center;"> <tr> <th><i>u</i></th> <th><i>g</i></th> <th><i>r</i></th> <th><i>i</i></th> <th><i>z</i></th> </tr> <tr> <td>3551 Å</td> <td>4686 Å</td> <td>6165 Å</td> <td>7481 Å</td> <td>8931 Å</td> </tr> <tr> <td>22.0</td> <td>22.2</td> <td>22.2</td> <td>21.3</td> <td>20.5</td> </tr> </table> </td> </tr> <tr> <td>Median PSF FWHM, <i>r</i>-band</td> <td>1.3 arcsec</td> </tr> <tr> <td>Pixel scale</td> <td>0.396 arcsec</td> </tr> <tr> <td>Exposure time per band</td> <td>53.9 sec</td> </tr> <tr> <td>Time difference between observations of each band</td> <td>71.72 sec (in <i>riuzg</i> order)</td> </tr> <tr> <td>Relative photometric calibration accuracy (RMS)<br /> <a href="http://adsabs.harvard.edu/abs/2008ApJ...674.1217P">(Padmanabhan et al. 2008)</a> </td> <td> <table class="noborder"> <tr> <th><i>u</i></th> <th><i>g</i></th> <th><i>r</i></th> <th><i>i</i></th> <th><i>z</i></th> </tr> <tr> <td>1.3%</td> <td>0.8%</td> <td>0.8%</td> <td>0.7%</td> <td>0.8%</td> </tr> </table> </td> </tr> <tr> <td>Global astrometric precision</td> <td>0.1 arcsec rms (absolute)</td> </tr> </table> <h2 id="specstats">Spectroscopic data statistics</span></h2> <table class="common"> <tr> <th style="text-align:center;"></th> <th style="text-align:center;"> SDSS spectrograph</th> <th style="text-align:center;"> BOSS spectrograph</th> </tr> <tr> <td>Area covered</td> <td> <table class="noborder"> <tr> <td>Full unique coverage</td> <td>9274 square degrees</td> </tr> <tr> <td>SEGUE-1 coverage</td> <td>1438 square degrees</td> </tr> <tr> <td>SEGUE-2 coverage</td> <td>1317 square degrees</td> </tr> <tr> <td>Legacy coverage</td> <td>7966 square degrees</td> </tr> </table> </td> <td> <table class="noborder"> <tr> <td>Full unique coverage</td> <td>3,275 square degrees</td> </tr> </table> </td> </tr> <tr> <td>Number of plates</td> <td> <table class="noborder"> <tr> <th>Category</th> <th style="text-align:right;">Total</th> <th style="text-align:right;"><a href="dr9/spectro/catalogs.php#platequality">Good/<br />marginal</a></th> <th style="text-align:right;"><a href="dr9/spectro/catalogs.php#platequality">Primary</a></th> </tr> <tr> <td>All programs</td> <td style="text-align:right;">2880</td> <td style="text-align:right;">2764</td> <td style="text-align:right;">2654</td> </tr> <tr> <td>Legacy</td> <td style="text-align:right;">1926</td> <td style="text-align:right;">1869</td> <td style="text-align:right;">1794</td> </tr> <tr> <td>SEGUE-1</td> <td style="text-align:right;">442</td> <td style="text-align:right;">427</td> <td style="text-align:right;">407</td> </tr> <tr> <td>SEGUE-2</td> <td style="text-align:right;">211</td> <td style="text-align:right;">211</td> <td style="text-align:right;">204</td> </tr> <tr> <td>Special</td> <td style="text-align:right;">301</td> <td style="text-align:right;">257</td> <td style="text-align:right;">246</td> </tr> </table> </td> <td> <table class="noborder"> <tr> <th>Category</th> <th style="text-align:right;">Total</th> <th style="text-align:right;"><a href="dr9/spectro/catalogs.php#platequality">Good/<br />marginal</a></th> <th style="text-align:right;"><a href="dr9/spectro/catalogs.php#platequality">Primary</a></th> </tr> <tr> <td>All programs</td> <td style="text-align:right;">831</td> <td style="text-align:right;">831</td> <td style="text-align:right;">819</td> </tr> <tr> <td>BOSS</td> <td style="text-align:right;">809</td> <td style="text-align:right;">809</td> <td style="text-align:right;">801</td> </tr> <tr> <td>Special</td> <td style="text-align:right;">22</td> <td style="text-align:right;">22</td> <td style="text-align:right;">18</td> </tr> </table> </td> </tr> <tr> <td>Plate area</td> <td>1.49 deg radius, 6.97 deg<sup>2</sup></td> <td>1.49 deg radius, 6.97 deg<sup>2</sup></td> </tr> <tr> <td>Fibers per plate</td> <td>640</td> <td>1000</td> </tr> <tr> <td>Numbers of spectra</td> <td> <table class="noborder"> <tr> <th>Category</th> <th style="text-align:right;">Total</th> <th style="text-align:right;">On <a href="dr9/spectro/catalogs.php#platequality">good or <br />marginal</a> plates </th> <th style="text-align:right;"><a href="dr9/spectro/catalogs.php#unique">Unique</a></th> </tr> <tr> <td>All programs</td> <td style="text-align:right;">1,843,200</td> <td style="text-align:right;">1,768,960</td> <td style="text-align:right;">1,629,129</td> </tr> <tr> <td>Main galaxy targets</td> <td style="text-align:right;">778,410</td> <td style="text-align:right;">755,111</td> <td style="text-align:right;">711,726</td> </tr> <tr> <td>LRG targets (excluding Main)</td> <td style="text-align:right;">106,650</td> <td style="text-align:right;">103,662</td> <td style="text-align:right;">95,990</td> </tr> <tr> <td>SEGUE-1 targets</td> <td style="text-align:right;">250,422</td> <td style="text-align:right;">242,008</td> <td style="text-align:right;">220,851</td> </tr> <tr> <td>SEGUE-2 targets</td> <td style="text-align:right;">128,112</td> <td style="text-align:right;">128,112</td> <td style="text-align:right;">118,151</td> </tr> <tr> <td>Stars</td> <td style="text-align:right;">600,967</td> <td style="text-align:right;">577,157</td> <td style="text-align:right;">521,990</td> </tr> <tr> <td>Galaxies</td> <td style="text-align:right;">952,740</td> <td style="text-align:right;">921,007</td> <td style="text-align:right;">860,836</td> </tr> <tr> <td>QSOs</td> <td style="text-align:right;">130,300</td> <td style="text-align:right;">126,368</td> <td style="text-align:right;">116,003</td> </tr> <tr> <td>Skies</td> <td style="text-align:right;">110,288</td> <td style="text-align:right;">103,046</td> <td style="text-align:right;">93,187</td> </tr> <tr> <td>Unknown</td> <td style="text-align:right;">48,905</td> <td style="text-align:right;">41,382</td> <td style="text-align:right;">37,113</td> </tr> </table> </td> <td> <table class="noborder"> <tr> <th>Category</th> <th>Total</th> <th style="text-align:right;">Unique</th> </tr> <tr> <td>Total</td> <td style="text-align:right;">831,000</td> <td style="text-align:right;">763,425</td> </tr> <tr> <td>Stars</td> <td style="text-align:right;">90,897</td> <td style="text-align:right;">82,645</td> </tr> <tr> <td>Galaxies</td> <td style="text-align:right;">535,995</td> <td style="text-align:right;">493,845</td> </tr> <tr> <td>QSOs</td> <td style="text-align:right;">102,100</td> <td style="text-align:right;">93,003</td> </tr> <tr> <td>Sky</td> <td style="text-align:right;">78,573</td> <td style="text-align:right;">75,850</td> </tr> <tr> <td>Unknown</td> <td style="text-align:right;">62,303</td> <td style="text-align:right;">54,978</td> </tr> </table> </td> </tr> <tr> <td>Wavelength coverage</td> <td>3800 to 9200 Å</td> <td>3600 to 10,400 Å</td> </tr> <tr> <td>Resolution</td> <td>1800 to 2000</td> <td>1400 to 2600 Å</td> </tr> <tr> <td>Median S/N</td> <td>at g(fiber) = 20.2 mag, 4.2 per pixel (Legacy)<br /> 7.0 per pixel (SEGUE-1, -2)</td> <td>at i(fiber) = 21 mag, 6.1 per pixel</td> </tr> <tr> <td>Typical redshift accuracy</td> <td>30 km/s rms for main galaxy sample (from repeat observations)<br /> 4.0 km/s rms for SEGUE near g=18th mag (from repeat observations)<br /> 1.8 km/s systematic limit for high signal-to-noise stars </td> <td>65 km/s rms for LRG sample (from repeat observations)<br /> 1.8 km/s systematic limit for high signal-to-noise stars </td> </tr> <tr> <td>Approximate magnitude limits<br /> (Corrected for Galactic dust extinction)</td> <td> <table class="noborder"> <tr> <td>Main sample galaxies</td> <td>Petrosian <i>r</i> < 17.77</td> <td><a href="http://adsabs.harvard.edu/abs/2002AJ....124.1810S">Strauss et al. (2002)</a></td> </tr> <tr> <td>Luminous Red Galaxies</td> <td>Petrosian <i>r</i> < 19.2</td> <td><a href="http://adsabs.harvard.edu/abs/2001AJ....122.2267E">Eisenstein et al. (2001)</a></td> </tr> <tr> <td>z < 3 quasars</td> <td>PSF <i>i</i> < 19.1</td> <td><a href="http://adsabs.harvard.edu/abs/2002AJ....123.2945R">Richards et al. (2002)</a></td> </tr> <tr> <td>z > 3 quasars</td> <td>PSF <i>i</i> < 20.2</td> <td><a href="http://adsabs.harvard.edu/abs/2002AJ....123.2945R">Richards et al. (2002)</a></td> </tr> <tr> <td>SEGUE-1 Faint</td> <td>PSF 17.8 < <i>r</i> < 20.1</td> <td><a href="http://adsabs.harvard.edu/abs/2009AJ....137.4377Y">Yanny et al. (2009)</a></td> </tr> <tr> <td>SEGUE-1 Bright</td> <td>PSF <i>r</i> < 17.8</td> <td><a href="http://adsabs.harvard.edu/abs/2009AJ....137.4377Y">Yanny et al. (2009)</a></td> </tr> <tr> <td>SEGUE-2</td> <td>PSF <i>r</i> < 20.2</td> <td></td> </tr> </table> </td> <td> <table class="noborder"> <tr> <td>LRGs</td> <td><i>i</i> < 19.9 </td> <td><a href="http://iopscience.iop.org/0004-637X/728/2/126">White et al. (2011)</a></td> </tr> <tr> <td>QSOs</td> <td><i>g</i> < 22<br /> <i>i</i> < 22</td> <td><a href="http://adsabs.harvard.edu/abs/2012ApJS..199....3R">Ross et al. (2012)</a></td> </tr> </table> </td> </tr> </table> <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>