Abstract
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since July 2014. This paper describes the second data release from this phase, and the fourteenth from SDSS overall (making this, Data Release Fourteen or DR14). This release makes public data taken by SDSS-IV in its first two years of operation (July 2014-2016). Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey (eBOSS); the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data driven machine learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS website (www.sdss.org) has been updated for this release, and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020, and will be followed by SDSS-V.
Highlights
It is sixteen years since the first data release from the Sloan Digital Sky Survey (SDSS; York et al 2000)
Fig. 2.— DR14 extended Baryon Oscillation Spectroscopic Survey (eBOSS) spectroscopic coverage in Equatorial coordinates Baryon Oscillation Spectroscopic Survey (BOSS) coverage is shown in grey, SEQUELS in red, and the eBOSS data newly released for DR14 is shown in blue
Multiwavelength properties of RASS and XMM-Newton Slew Survey point source catalog (XMMSL) AGN. In these two Value Added Catalogues (VACs), we present the multi-wavelength characterization over the area covered by the SEQUELS and eBOSS DR14 surveys ( 2500 deg2) of two highly complete samples of X-ray sources: 1. The ROSAT All-Sky Survey (RASS) X-ray source catalogue (2XRS; Boller et al 2016)
Summary
It is sixteen years since the first data release from the Sloan Digital Sky Survey (SDSS; York et al 2000). Most stellar surveys of equivalent scale – including those which have concluded (e.g., RAVE, SEGUE-1 and -2, and ARGOS; Steinmetz+2006, Yanny+2009, Rockosi+2009, Freeman+2013), are currently underway (e.g., LAMOST, Gaia-ESO, GALAH, and Gaia; Cui+2012, Gilmore+2012, Zucker+2012, Permian+2001), or are anticipated in the future (e.g., WEAVE, 4MOST, and MOONS; Dalton+2014, de Jong+2014, Cirasuolo+2014) – have been or will be performed in the optical, and/or with largely medium spectral resolution ( we note plans for a high-res modes for some of these) All of these projects provide complementary data in the form of different wavelength or spatial regimes providing essential contributions to the ongoing census of the Milky Way’s stars.
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