Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

BLANTON, MICHAEL R.; BERSHADY, MATTHEW A.; ABOLFATHI, BELA; ALBARETI, FRANCO D.; PRIETO, CARLOS ALLENDE; ALMEIDA, ANDRES; ALONSO-GARCÍA, JAVIER; ANDERS, FRIEDRICH; ANDERSON, SCOTT F.; ANDREWS, BRETT; AQUINO-ORTÍZ, ERIK; ARAGÓN-SALAMANCA, ALFONSO; ARGUDO-FERNÁNDEZ, MARIA; ARMENGAUD, ERIC; AUBOURG, ERIC; AVILA-REESE, VLADIMIR; BADENES, CARLES; BAILEY, STEPHEN; BARGER, KATHLEEN A.; BARRERA-BALLESTEROS, JORGE; BARTOSZ, CURTIS; BATES, DOMINIC; BAUMGARTEN, FALK; BAUTISTA, JULIAN; BEATON, RACHAEL; BEERS, TIMOTHY C.; BELFIORE, FRANCESCO; BENDER, CHAD F.; BERLIND, ANDREAS A.; BERNARDI, MARIANGELA; BEUTLER, FLORIAN; BIRD, JONATHAN C.; BIZYAEV, DMITRY; BLANC, GUILLERMO A.; BLOMQVIST, MICHAEL; BOLTON, ADAM S.; BOQUIEN, MÉDÉRIC; BORISSOVA, JURA; BOSCH, REMCO VAN DEN; BOVY, JO; BRANDT, WILLIAM N.; BRINKMANN, JONATHAN; BROWNSTEIN, JOEL R.; BUNDY, KEVIN; BURGASSER, ADAM J.; BURTIN, ETIENNE; BUSCA, NICOLÁS G.; CAPPELLARI, MICHELE; CARIGI, MARIA LETICIA DELGADO; CARLBERG, JOLEEN K.; ROSELL, AURELIO CARNERO; CARRERA, RICARDO; C

ASTRONOMICAL JOURNAL

IOP PUBLISHING LTD

Año: 2017 vol. 154

0004-6256

We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratios in the near-infrared. The Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey is obtaining spatially resolved spectroscopy for thousands of nearby galaxies (median z ∼ 0.03). The extended Baryon Oscillation Spectroscopic Survey (eBOSS) is mapping the galaxy, quasar, and neutral gas distributions between z ~ 0.6 and 3.5 to constrain cosmology using baryon acoustic oscillations, redshift space distortions, and the shape of the power spectrum. Within eBOSS, we are conducting two major subprograms: the SPectroscopic IDentification of eROSITA Sources (SPIDERS), investigating X-ray AGNs and galaxies in X-ray clusters, and the Time Domain Spectroscopic Survey (TDSS), obtaining spectra of variable sources. All programs use the 2.5 m Sloan Foundation Telescope at the Apache Point Observatory; observations there began in Summer 2014. APOGEE-2 also operates a second near-infrared spectrograph at the 2.5 m du Pont Telescope at Las Campanas Observatory, with observations beginning in early 2017. Observations at both facilities are scheduled to continue through 2020. In keeping with previous SDSS policy, SDSS-IV provides regularly scheduled public data releases; the first one, Data Release 13, was made available in 2016 July.