THE SDSS-IV EXTENDED BARYON OSCILLATION SPECTROSCOPIC SURVEY: OVERVIEW AND EARLY DATA

In a six-year program started in 2014 July, the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. These observations will be conducted simultaneously with the Time Domain Spectroscopic Survey (TDSS) designed for variability studies and the Spectroscopic Identification of eROSITA Sources (SPIDERS) program designed for studies of X-ray sources. In particular, eBOSS will measure with percent-level precision the distance-redshift relation with baryon acoustic oscillations (BAO) in the clustering of matter. eBOSS will use four different tracers of the underlying matter density field to vastly expand the volume covered by BOSS and map the large-scale-structures over the relatively unconstrained redshift range 0.6 0.6 sample of BOSS galaxies. With ~195,000 new emission line galaxy redshifts, we expect BAO measurements of d_A(z) to an accuracy of 3.1% and H(z) to 4.7% at an effective redshift of z = 0.87. A sample of more than 500,000 spectroscopically confirmed quasars will provide the first BAO distance measurements over the redshift range 0.9 2.1; these new data will enhance the precision of dA(z) and H(z) at z > 2.1 by a factor of 1.44 relative to BOSS. Furthermore, eBOSS will provide improved tests of General Relativity on cosmological scales through redshift-space distortion measurements, improved tests for non-Gaussianity in the primordial density field, and new constraints on the summed mass of all neutrino species. Here, we provide an overview of the cosmological goals, spectroscopic target sample, demonstration of spectral quality from early data, and projected cosmological constraints from eBOSS.

W. M. Wood-Vasey | A. Myers | A. Slosar | M. Bershady | J. Brinkmann | D. Schneider | A. Ealet | W. Percival | J. Kneib | C. Tao | J. Peacock | F. D. Albareti | S. Anderson | E. Armengaud | S. Bailey | J. Bautista | F. Beutler | D. Bizyaev | M. Blanton | M. Blomqvist | A. Bolton | J. Bovy | J. Brownstein | E. Burtin | N. Busca | Z. Cai | A. Rosell | Chia-Hsun Chuang | N. Clerc | J. Comparat | R. Croft | L. Costa | K. Dawson | T. Delubac | T. Dwelly | D. Eisenstein | S. Escoffier | Xiaohui Fan | A. Finoguenov | A. Font-Ribera | P. Frinchaboy | P. Gaulme | Hong Guo | S. Ho | J. Huehnerhoff | K. Kinemuchi | D. Kirkby | F. Kitaura | M. Klaene | D. Lang | Pierre Laurent | J. M. Goff | D. Long | B. Lundgren | M. Maia | E. Malanushenko | V. Malanushenko | C. McBride | I. McGreer | A. Merloni | A. Montero-Dorta | D. Muna | J. Newman | P. Noterdaeme | R. Ogando | M. Olmstead | A. Oravetz | D. Oravetz | N. Padmanabhan | N. Palanque-Delabrouille | K. Pan | J. Parejko | I. Pâris | P. Petitjean | M. Pieri | F. Prada | A. Prakash | B. Reid | J. Rich | A. Ross | G. Rossi | J. Ruan | M. Salvato | C. Sayres | D. Schlegel | H. Seo | Y. Shu | F. Sobreira | A. Streblyanska | J. Tinker | R. Tojeiro | M. Vargas-Magaña | B. Weaver | D. Weinberg | M. White | W. Wood-Vasey | C. Yèche | Gong-Bo Zhao | Zheng Zheng | G. Zhu | M. Lima | E. Aubourg | A. Berlind | W. Brandt | Yen-Ting Lin | N. MacDonald | B. Ménard | T. Naugle | P. Nugent | Y. Liang | J. Guy | N. Suzuki | Yuting Wang | S. Alam | F. Cope | I. Cruz-Gonzalez | M. Cousinou | J. Darling | A. D. L. Macorra | S. L. Torre | Hélion du Mas des Bourboux | M. Eracleous | A. Georgakakis | P. Green | D. Holder | T. Hutchinson | Y. Jing | E. Jullo | Vikrant Kamble | R. Laher | Cheng Li | Q. Lin | Weipeng Lin | V. Mariappan | A. Meza | K. Nandra | A. Pisani | A. Raichoor | J. Ridl | S. Rodriguez-Torres | U. Seljak | B. Sesar | S. Shandera | Donna Taylor | Zhongxu Zhai | Cheng Zhao | H. Zou | A. C. Rosell | S. D. Torre | C. Chuang | X. Fan | D. Schneider | A. Macorra | G. Zhao | S. Rodríguez-Torres | C. Yéche | Hélion Marie du Mas des Bourboux | I. Cruz-González | J. Goff | É. Burtin | Sergio A. Rodríguez-Torres | S. Anderson | D. Schneider | D. Schneider | H. Seo

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