The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data

Kyle S. Dawson; Jean-Paul Kneib; Will J. Percival; Shadab Alam; Franco D. Albareti; Scott F. Anderson; Eric Armengaud; Eric Aubourg; Stephen Bailey; Julian E. Bautista; Andreas A. Berlind; Matthew A. Bershady; Florian Beutler; Dmitry Bizyaev; Michael R. Blanton; Michael Blomqvist; Adam S. Bolton; Jo Bovy; W. N. Brandt; Jon Brinkmann; Joel R. Brownstein; Etienne Burtin; N. G. Busca; Zheng Cai; Chia-Hsun Chuang; Nicolas Clerc; Johan Comparat; Frances Cope; Rupert A. C. Croft; Irene Cruz-Gonzalez; Luiz N. da Costa; Marie-Claude Cousinou; Jeremy Darling; Axel de la Macorra; Sylvain de la Torre; Timothee Delubac; Helion du Mas des Bourboux; Tom Dwelly; Anne Ealet; Daniel J. Eisenstein; Michael Eracleous; S. Escoffier; Xiaohui Fan; Alexis Finoguenov; Andreu Font-Ribera; Peter Frinchaboy; Patrick Gaulme; Antonis Georgakakis; Paul Green; Hong Guo; Julien Guy; Shirley Ho; Diana Holder; Joe Huehnerhoff; Timothy Hutchinson; Yipeng Jing; Eric Jullo; Vikrant Kamble; Karen Kinemuchi; David Kirkby; Francisco-Shu Kitaura; Mark A. Klaene; Russ R. Laher; Dustin Lang; Pierre Laurent; Jean-Marc Le Goff; Cheng Li; Yu Liang; Marcos Lima; Qiufan Lin; Weipeng Lin; Yen-Ting Lin; Daniel C. Long; Britt Lundgren; Nicholas MacDonald; Marcio Antonio Geimba Maia; Elena Malanushenko; Viktor Malanushenko; Vivek Mariappan; Cameron K. McBride; Ian D. McGreer; Brice Menard; Andrea Merloni; Andres Meza; Antonio D. Montero-Dorta; Demitri Muna; Adam D. Myers; Kirpal Nandra; Tracy Naugle; Jeffrey A. Newman; Pasquier Noterdaeme; Peter Nugent; Ricardo Ogando; Matthew D. Olmstead; Audrey Oravetz; Daniel J. Oravetz; Nikhil Padmanabhan; Nathalie Palanque-Delabrouille; Kaike Pan; John K. Parejko; Isabelle Paris; John A. Peacock; Patrick Petitjean; Matthew M. Pieri; Alice Pisani; Francisco Prada; Abhishek Prakash; Anand Raichoor; Beth Reid; James Rich; Jethro Ridl; Sergio Rodriguez-Torres; Aurelio Carnero Rosell; Ashley J. Ross; Graziano Rossi; John Ruan; Mara Salvato; Conor Sayres; Donald P. Schneider; David J. Schlegel; Uros Seljak; Hee-Jong Seo; Branimir Sesar; Sarah Shandera; Yiping Shu; Anze Slosar; Flavia Sobreira; Alina Streblyanska; Nao Suzuki; Donna Taylor; Charling Tao; Jeremy L. Tinker; Rita Tojeiro; Mariana Vargas-Magana; Yuting Wang; Benjamin A. Weaver; David H. Weinberg; Martin White; W. M. Wood-Vasey; Christophe Yeche; Zhongxu Zhai; Cheng Zhao; Gong-bo Zhao; Zheng Zheng; Guangtun Ben Zhu; Hu Zou

doi:10.3847/0004-6256/151/2/44

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data

Kyle S. Dawson, Jean-Paul Kneib, Will J. Percival, Shadab Alam, Franco D. Albareti, Scott F. Anderson, Eric Armengaud, Eric Aubourg, Stephen Bailey, Julian E. Bautista, Andreas A. Berlind, Matthew A. Bershady, Florian Beutler, Dmitry Bizyaev, Michael R. Blanton, Michael Blomqvist, Adam S. Bolton, Jo Bovy, W. N. Brandt, Jon BrinkmannJoel R. Brownstein, Etienne Burtin, N. G. Busca, Zheng Cai, Chia-Hsun Chuang, Nicolas Clerc, Johan Comparat, Frances Cope, Rupert A. C. Croft, Irene Cruz-Gonzalez, Luiz N. da Costa, Marie-Claude Cousinou, Jeremy Darling, Axel de la Macorra, Sylvain de la Torre, Timothee Delubac, Helion du Mas des Bourboux, Tom Dwelly, Anne Ealet, Daniel J. Eisenstein, Michael Eracleous, S. Escoffier, Xiaohui Fan, Alexis Finoguenov, Andreu Font-Ribera, Peter Frinchaboy, Patrick Gaulme, Antonis Georgakakis, Paul Green, Hong Guo, Julien Guy, Shirley Ho, Diana Holder, Joe Huehnerhoff, Timothy Hutchinson, Yipeng Jing, Eric Jullo, Vikrant Kamble, Karen Kinemuchi, David Kirkby, Francisco-Shu Kitaura, Mark A. Klaene, Russ R. Laher, Dustin Lang, Pierre Laurent, Jean-Marc Le Goff, Cheng Li, Yu Liang, Marcos Lima, Qiufan Lin, Weipeng Lin, Yen-Ting Lin, Daniel C. Long, Britt Lundgren, Nicholas MacDonald, Marcio Antonio Geimba Maia, Elena Malanushenko, Viktor Malanushenko, Vivek Mariappan, Cameron K. McBride, Ian D. McGreer, Brice Menard, Andrea Merloni, Andres Meza, Antonio D. Montero-Dorta, Demitri Muna, Adam D. Myers, Kirpal Nandra, Tracy Naugle, Jeffrey A. Newman, Pasquier Noterdaeme, Peter Nugent, Ricardo Ogando, Matthew D. Olmstead, Audrey Oravetz, Daniel J. Oravetz, Nikhil Padmanabhan, Nathalie Palanque-Delabrouille, Kaike Pan, John K. Parejko, Isabelle Paris, John A. Peacock, Patrick Petitjean, Matthew M. Pieri, Alice Pisani, Francisco Prada, Abhishek Prakash, Anand Raichoor, Beth Reid, James Rich, Jethro Ridl, Sergio Rodriguez-Torres, Aurelio Carnero Rosell, Ashley J. Ross, Graziano Rossi, John Ruan, Mara Salvato, Conor Sayres, Donald P. Schneider, David J. Schlegel, Uros Seljak, Hee-Jong Seo, Branimir Sesar, Sarah Shandera, Yiping Shu, Anze Slosar, Flavia Sobreira, Alina Streblyanska, Nao Suzuki, Donna Taylor, Charling Tao, Jeremy L. Tinker, Rita Tojeiro, Mariana Vargas-Magana, Yuting Wang, Benjamin A. Weaver, David H. Weinberg, Martin White, W. M. Wood-Vasey, Christophe Yeche, Zhongxu Zhai, Cheng Zhao, Gong-bo Zhao, Zheng Zheng, Guangtun Ben Zhu, Hu Zou

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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 < z < 2.2. Using more than 250,000 new, spectroscopically confirmed luminous red galaxies at a median redshift z = 0.72, we project that eBOSS will yield measurements of the angular diameter distance d_A(z) to an accuracy of 1.2% and measurements of H(z) to 2.1% when combined with the z > 0.6 sample of BOSS galaxies. With ~195,000 new emission line galaxy redshifts, we expect BAO measurements of dA(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 < z < 2.2, with expected precision of 2.8% and 4.2% on d_A(z) and H(z), respectively. Finally, with 60,000 new quasars and re-observation of 60,000 BOSS quasars, we will obtain new Lyα forest measurements at redshifts z > 2.1; these new data will enhance the precision of d_A(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.

Original language	English
Article number	44
Number of pages	39
Journal	Astronomical Journal
Volume	151
Issue number	2
Early online date	4 Feb 2016
DOIs	https://doi.org/10.3847/0004-6256/151/2/44
Publication status	Published - Feb 2016

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astro-ph.CO

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10.3847/0004-6256/151/2/44

eBOSS_early_dataAccepted author manuscript, 3.38 MB

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Dawson, K. S., Kneib, J.-P., Percival, W. J., Alam, S., Albareti, F. D., Anderson, S. F., Armengaud, E., Aubourg, E., Bailey, S., Bautista, J. E., Berlind, A. A., Bershady, M. A., Beutler, F., Bizyaev, D., Blanton, M. R., Blomqvist, M., Bolton, A. S., Bovy, J., Brandt, W. N., ... Zou, H. (2016). The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data. Astronomical Journal, 151(2), Article 44. https://doi.org/10.3847/0004-6256/151/2/44

@article{2407f015e25c40ada7b019c91da107b6,

title = "The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data",

abstract = "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 < z < 2.2. Using more than 250,000 new, spectroscopically confirmed luminous red galaxies at a median redshift z = 0.72, we project that eBOSS will yield measurements of the angular diameter distance dA(z) to an accuracy of 1.2% and measurements of H(z) to 2.1% when combined with the z > 0.6 sample of BOSS galaxies. With ~195,000 new emission line galaxy redshifts, we expect BAO measurements of dA(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 < z < 2.2, with expected precision of 2.8% and 4.2% on dA(z) and H(z), respectively. Finally, with 60,000 new quasars and re-observation of 60,000 BOSS quasars, we will obtain new Lyα forest measurements at redshifts z > 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.",

keywords = "astro-ph.CO",

author = "Dawson, {Kyle S.} and Jean-Paul Kneib and Percival, {Will J.} and Shadab Alam and Albareti, {Franco D.} and Anderson, {Scott F.} and Eric Armengaud and Eric Aubourg and Stephen Bailey and Bautista, {Julian E.} and Berlind, {Andreas A.} and Bershady, {Matthew A.} and Florian Beutler and Dmitry Bizyaev and Blanton, {Michael R.} and Michael Blomqvist and Bolton, {Adam S.} and Jo Bovy and Brandt, {W. N.} and Jon Brinkmann and Brownstein, {Joel R.} and Etienne Burtin and Busca, {N. G.} and Zheng Cai and Chia-Hsun Chuang and Nicolas Clerc and Johan Comparat and Frances Cope and Croft, {Rupert A. C.} and Irene Cruz-Gonzalez and Costa, {Luiz N. da} and Marie-Claude Cousinou and Jeremy Darling and Macorra, {Axel de la} and Torre, {Sylvain de la} and Timothee Delubac and Bourboux, {Helion du Mas des} and Tom Dwelly and Anne Ealet and Eisenstein, {Daniel J.} and Michael Eracleous and S. Escoffier and Xiaohui Fan and Alexis Finoguenov and Andreu Font-Ribera and Peter Frinchaboy and Patrick Gaulme and Antonis Georgakakis and Paul Green and Hong Guo and Julien Guy and Shirley Ho and Diana Holder and Joe Huehnerhoff and Timothy Hutchinson and Yipeng Jing and Eric Jullo and Vikrant Kamble and Karen Kinemuchi and David Kirkby and Francisco-Shu Kitaura and Klaene, {Mark A.} and Laher, {Russ R.} and Dustin Lang and Pierre Laurent and Goff, {Jean-Marc Le} and Cheng Li and Yu Liang and Marcos Lima and Qiufan Lin and Weipeng Lin and Yen-Ting Lin and Long, {Daniel C.} and Britt Lundgren and Nicholas MacDonald and Maia, {Marcio Antonio Geimba} and Elena Malanushenko and Viktor Malanushenko and Vivek Mariappan and McBride, {Cameron K.} and McGreer, {Ian D.} and Brice Menard and Andrea Merloni and Andres Meza and Montero-Dorta, {Antonio D.} and Demitri Muna and Myers, {Adam D.} and Kirpal Nandra and Tracy Naugle and Newman, {Jeffrey A.} and Pasquier Noterdaeme and Peter Nugent and Ricardo Ogando and Olmstead, {Matthew D.} and Audrey Oravetz and Oravetz, {Daniel J.} and Nikhil Padmanabhan and Nathalie Palanque-Delabrouille and Kaike Pan and Parejko, {John K.} and Isabelle Paris and Peacock, {John A.} and Patrick Petitjean and Pieri, {Matthew M.} and Alice Pisani and Francisco Prada and Abhishek Prakash and Anand Raichoor and Beth Reid and James Rich and Jethro Ridl and Sergio Rodriguez-Torres and Rosell, {Aurelio Carnero} and Ross, {Ashley J.} and Graziano Rossi and John Ruan and Mara Salvato and Conor Sayres and Schneider, {Donald P.} and Schlegel, {David J.} and Uros Seljak and Hee-Jong Seo and Branimir Sesar and Sarah Shandera and Yiping Shu and Anze Slosar and Flavia Sobreira and Alina Streblyanska and Nao Suzuki and Donna Taylor and Charling Tao and Tinker, {Jeremy L.} and Rita Tojeiro and Mariana Vargas-Magana and Yuting Wang and Weaver, {Benjamin A.} and Weinberg, {David H.} and Martin White and Wood-Vasey, {W. M.} and Christophe Yeche and Zhongxu Zhai and Cheng Zhao and Gong-bo Zhao and Zheng Zheng and Zhu, {Guangtun Ben} and Hu Zou",

note = "39 pages, 13 figures, accepted AJ, revised for consistency with accepted version",

year = "2016",

month = feb,

doi = "10.3847/0004-6256/151/2/44",

language = "English",

volume = "151",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing",

number = "2",

}

Dawson, KS, Kneib, J-P, Percival, WJ, Alam, S, Albareti, FD, Anderson, SF, Armengaud, E, Aubourg, E, Bailey, S, Bautista, JE, Berlind, AA, Bershady, MA, Beutler, F, Bizyaev, D, Blanton, MR, Blomqvist, M, Bolton, AS, Bovy, J, Brandt, WN, Brinkmann, J, Brownstein, JR, Burtin, E, Busca, NG, Cai, Z, Chuang, C-H, Clerc, N, Comparat, J, Cope, F, Croft, RAC, Cruz-Gonzalez, I, Costa, LND, Cousinou, M-C, Darling, J, Macorra, ADL, Torre, SDL, Delubac, T, Bourboux, HDMD, Dwelly, T, Ealet, A, Eisenstein, DJ, Eracleous, M, Escoffier, S, Fan, X, Finoguenov, A, Font-Ribera, A, Frinchaboy, P, Gaulme, P, Georgakakis, A, Green, P, Guo, H, Guy, J, Ho, S, Holder, D, Huehnerhoff, J, Hutchinson, T, Jing, Y, Jullo, E, Kamble, V, Kinemuchi, K, Kirkby, D, Kitaura, F-S, Klaene, MA, Laher, RR, Lang, D, Laurent, P, Goff, J-ML, Li, C, Liang, Y, Lima, M, Lin, Q, Lin, W, Lin, Y-T, Long, DC, Lundgren, B, MacDonald, N, Maia, MAG, Malanushenko, E, Malanushenko, V, Mariappan, V, McBride, CK, McGreer, ID, Menard, B, Merloni, A, Meza, A, Montero-Dorta, AD, Muna, D, Myers, AD, Nandra, K, Naugle, T, Newman, JA, Noterdaeme, P, Nugent, P, Ogando, R, Olmstead, MD, Oravetz, A, Oravetz, DJ, Padmanabhan, N, Palanque-Delabrouille, N, Pan, K, Parejko, JK, Paris, I, Peacock, JA, Petitjean, P, Pieri, MM, Pisani, A, Prada, F, Prakash, A, Raichoor, A, Reid, B, Rich, J, Ridl, J, Rodriguez-Torres, S, Rosell, AC, Ross, AJ, Rossi, G, Ruan, J, Salvato, M, Sayres, C, Schneider, DP, Schlegel, DJ, Seljak, U, Seo, H-J, Sesar, B, Shandera, S, Shu, Y, Slosar, A, Sobreira, F, Streblyanska, A, Suzuki, N, Taylor, D, Tao, C, Tinker, JL, Tojeiro, R, Vargas-Magana, M, Wang, Y, Weaver, BA, Weinberg, DH, White, M, Wood-Vasey, WM, Yeche, C, Zhai, Z, Zhao, C, Zhao, G, Zheng, Z, Zhu, GB & Zou, H 2016, 'The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data', Astronomical Journal, vol. 151, no. 2, 44. https://doi.org/10.3847/0004-6256/151/2/44

TY - JOUR

T1 - The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data

AU - Dawson, Kyle S.

AU - Kneib, Jean-Paul

AU - Percival, Will J.

AU - Alam, Shadab

AU - Albareti, Franco D.

AU - Anderson, Scott F.

AU - Armengaud, Eric

AU - Aubourg, Eric

AU - Bailey, Stephen

AU - Bautista, Julian E.

AU - Berlind, Andreas A.

AU - Bershady, Matthew A.

AU - Beutler, Florian

AU - Bizyaev, Dmitry

AU - Blanton, Michael R.

AU - Blomqvist, Michael

AU - Bolton, Adam S.

AU - Bovy, Jo

AU - Brandt, W. N.

AU - Brinkmann, Jon

AU - Brownstein, Joel R.

AU - Burtin, Etienne

AU - Busca, N. G.

AU - Cai, Zheng

AU - Chuang, Chia-Hsun

AU - Clerc, Nicolas

AU - Comparat, Johan

AU - Cope, Frances

AU - Croft, Rupert A. C.

AU - Cruz-Gonzalez, Irene

AU - Costa, Luiz N. da

AU - Cousinou, Marie-Claude

AU - Darling, Jeremy

AU - Macorra, Axel de la

AU - Torre, Sylvain de la

AU - Delubac, Timothee

AU - Bourboux, Helion du Mas des

AU - Dwelly, Tom

AU - Ealet, Anne

AU - Eisenstein, Daniel J.

AU - Eracleous, Michael

AU - Escoffier, S.

AU - Fan, Xiaohui

AU - Finoguenov, Alexis

AU - Font-Ribera, Andreu

AU - Frinchaboy, Peter

AU - Gaulme, Patrick

AU - Georgakakis, Antonis

AU - Green, Paul

AU - Guo, Hong

AU - Guy, Julien

AU - Ho, Shirley

AU - Holder, Diana

AU - Huehnerhoff, Joe

AU - Hutchinson, Timothy

AU - Jing, Yipeng

AU - Jullo, Eric

AU - Kamble, Vikrant

AU - Kinemuchi, Karen

AU - Kirkby, David

AU - Kitaura, Francisco-Shu

AU - Klaene, Mark A.

AU - Laher, Russ R.

AU - Lang, Dustin

AU - Laurent, Pierre

AU - Goff, Jean-Marc Le

AU - Li, Cheng

AU - Liang, Yu

AU - Lima, Marcos

AU - Lin, Qiufan

AU - Lin, Weipeng

AU - Lin, Yen-Ting

AU - Long, Daniel C.

AU - Lundgren, Britt

AU - MacDonald, Nicholas

AU - Maia, Marcio Antonio Geimba

AU - Malanushenko, Elena

AU - Malanushenko, Viktor

AU - Mariappan, Vivek

AU - McBride, Cameron K.

AU - McGreer, Ian D.

AU - Menard, Brice

AU - Merloni, Andrea

AU - Meza, Andres

AU - Montero-Dorta, Antonio D.

AU - Muna, Demitri

AU - Myers, Adam D.

AU - Nandra, Kirpal

AU - Naugle, Tracy

AU - Newman, Jeffrey A.

AU - Noterdaeme, Pasquier

AU - Nugent, Peter

AU - Ogando, Ricardo

AU - Olmstead, Matthew D.

AU - Oravetz, Audrey

AU - Oravetz, Daniel J.

AU - Padmanabhan, Nikhil

AU - Palanque-Delabrouille, Nathalie

AU - Pan, Kaike

AU - Parejko, John K.

AU - Paris, Isabelle

AU - Peacock, John A.

AU - Petitjean, Patrick

AU - Pieri, Matthew M.

AU - Pisani, Alice

AU - Prada, Francisco

AU - Prakash, Abhishek

AU - Raichoor, Anand

AU - Reid, Beth

AU - Rich, James

AU - Ridl, Jethro

AU - Rodriguez-Torres, Sergio

AU - Rosell, Aurelio Carnero

AU - Ross, Ashley J.

AU - Rossi, Graziano

AU - Ruan, John

AU - Salvato, Mara

AU - Sayres, Conor

AU - Schneider, Donald P.

AU - Schlegel, David J.

AU - Seljak, Uros

AU - Seo, Hee-Jong

AU - Sesar, Branimir

AU - Shandera, Sarah

AU - Shu, Yiping

AU - Slosar, Anze

AU - Sobreira, Flavia

AU - Streblyanska, Alina

AU - Suzuki, Nao

AU - Taylor, Donna

AU - Tao, Charling

AU - Tinker, Jeremy L.

AU - Tojeiro, Rita

AU - Vargas-Magana, Mariana

AU - Wang, Yuting

AU - Weaver, Benjamin A.

AU - Weinberg, David H.

AU - White, Martin

AU - Wood-Vasey, W. M.

AU - Yeche, Christophe

AU - Zhai, Zhongxu

AU - Zhao, Cheng

AU - Zhao, Gong-bo

AU - Zheng, Zheng

AU - Zhu, Guangtun Ben

AU - Zou, Hu

N1 - 39 pages, 13 figures, accepted AJ, revised for consistency with accepted version

PY - 2016/2

Y1 - 2016/2

N2 - 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 < z < 2.2. Using more than 250,000 new, spectroscopically confirmed luminous red galaxies at a median redshift z = 0.72, we project that eBOSS will yield measurements of the angular diameter distance dA(z) to an accuracy of 1.2% and measurements of H(z) to 2.1% when combined with the z > 0.6 sample of BOSS galaxies. With ~195,000 new emission line galaxy redshifts, we expect BAO measurements of dA(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 < z < 2.2, with expected precision of 2.8% and 4.2% on dA(z) and H(z), respectively. Finally, with 60,000 new quasars and re-observation of 60,000 BOSS quasars, we will obtain new Lyα forest measurements at redshifts z > 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.

AB - 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 < z < 2.2. Using more than 250,000 new, spectroscopically confirmed luminous red galaxies at a median redshift z = 0.72, we project that eBOSS will yield measurements of the angular diameter distance dA(z) to an accuracy of 1.2% and measurements of H(z) to 2.1% when combined with the z > 0.6 sample of BOSS galaxies. With ~195,000 new emission line galaxy redshifts, we expect BAO measurements of dA(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 < z < 2.2, with expected precision of 2.8% and 4.2% on dA(z) and H(z), respectively. Finally, with 60,000 new quasars and re-observation of 60,000 BOSS quasars, we will obtain new Lyα forest measurements at redshifts z > 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.

KW - astro-ph.CO

U2 - 10.3847/0004-6256/151/2/44

DO - 10.3847/0004-6256/151/2/44

M3 - Article

SN - 0004-6256

VL - 151

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - 44

ER -

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data

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Access to Document

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Cite this