Publications de Timothée Guy Olivier Delubac

Quasi-stellar objects acting as potential strong gravitational lenses in the SDSS-III BOSS survey

Frédéric Courbin, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac

We present a sample of 12 quasi-stellar objects (QSOs) that potentially act as strong gravitational lenses on background emission line galaxies (ELG) or Lyman-alpha emitters (LAEs) selected through a systematic search of the 297 301 QSOs in the Sloan Digit ...

EDP SCIENCES S A2019

Overview of the DESI Legacy Imaging Surveys

Johan Comparat, Elodie Marie Charlène Savary, Claudio Gorgoni, Zhou Xue, Paul Carter, Abhijit Saha, Jean-Paul Richard Kneib, Tobias Gabriel Meier, Alejandro Alvarez, Huanyuan Shan, Timothée Guy Olivier Delubac, Anand Stéphane Raichoor, Arjun Dey, David Schlegel

The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image approximate to 14,000 ...

IOP PUBLISHING LTD2019

The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment

Guillaume Blanc, Ghazaleh Erfanianfar, Johan Comparat, Amy Jones, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Yu Liang, Anand Stéphane Raichoor, John Wilson, Hongyu Li, Cheng Zhao, Yuting Wang, Meng Yang, David Schlegel, Yue Shen, Cheng Li, Zheng Zheng, Jiayi Sun

2018

Exploring cosmic homogeneity with the BOSS DR12 galaxy sample

Pierre Laurent, Timothée Guy Olivier Delubac

In this study, we probe the transition to cosmic homogeneity in the Large Scale Structure (LSS) of the Universe using the CMASS galaxy sample of BOSS spectroscopic survey which covers the largest effective volume to date, 3 h(-3) Gpc(3) at 0.43

Iop Publishing Ltd2017

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: final emission line galaxy target selection

Johan Comparat, Claudio Gorgoni, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Anand Stéphane Raichoor, Arjun Dey, David Schlegel, Yi Wang

We describe the algorithm used to select the emission line galaxy (ELG) sample at z similar to 0.85 for the extended Baryon Oscillation Spectroscopic Survey of the Sloan Digital Sky Survey IV, using photometric data from the DECam Legacy Survey. Our select ...

Oxford Univ Press2017

Measurement of baryon acoustic oscillation correlations at z=2.3 with SDSS DR12 Ly alpha-Forests

Timothée Guy Olivier Delubac

Here, we use flux-transmission correlations in Ly alpha forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157,783 quasars in the redshift range 2.1

Edp Sciences S A2017

The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

Guillaume Blanc, Johan Comparat, Amy Jones, Pierre Laurent, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Yu Liang, Chao Liu, Anand Stéphane Raichoor, John Wilson, Cheng Zhao, Yuting Wang, Meng Yang, Michael James Henry Smith, David Schlegel, Ginevra Favole, Cheng Li, Zheng Zheng, Yang Gao, Jiayi Sun, Chen Li

The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and the Extend ...

Iop Publishing Ltd2017

The SDSS-IV eBOSS: emission line galaxy catalogues at z approximate to 0.8 and study of systematic errors in the angular clustering

Johan Comparat, Xiaoqing Zhou, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Anand Stéphane Raichoor

We present two wide-field catalogues of photometrically selected emission line galaxies (ELGs) at z approximate to 0.8 covering about 2800 deg(2)over the south galactic cap. The catalogues were obtained using a Fisher discriminant technique described in a ...

Oxford Univ Press2017

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

Guillaume Blanc, Johan Comparat, Amy Jones, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Chao Liu, Anand Stéphane Raichoor, John Wilson, Hongyu Li, Yuting Wang, Meng Yang, David Schlegel, Cheng Li, Zheng Zheng, Jiayi Sun

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 resoluti ...

2017

Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

Eduardo Sanchez, Johan Comparat, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Yi Zhang

We present the results of the first observations of the emission line galaxies (ELG) of the extended Baryon Oscillation Spectroscopic Survey. From the total 9000 targets, 4600 have been selected from the Dark Energy Survey (DES). In this subsample, the tot ...

Oxford Univ Press2017

The Sdss-Iv Extended Baryon Oscillation Spectroscopic Survey: Luminous Red Galaxy Target Selection

Johan Comparat, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, David Schlegel

We describe the algorithm used to select the luminous red galaxy (LRG) sample for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV) using photometric data from both the SDSS and the Wide-field Infrare ...

Iop Publishing Ltd2016

The evolution of the [O II], H beta and [O III] emission line luminosity functions over the last nine billions years

Johan Richard, Johan Comparat, Jeffrey Newman, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Anand Stéphane Raichoor

Emission line galaxies are one of the main tracers of the large-scale structure to be targeted by the next-generation dark energy surveys. To provide a better understanding of the properties and statistics of these galaxies, we have collected spectroscopic ...

Oxford Univ Press2016

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: selecting emission line galaxies using the Fisher discriminant

Johan Comparat, Xiaoqing Zhou, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Jian Wang, Anand Stéphane Raichoor, Zhe Jiang

We present a new selection technique of producing spectroscopic target catalogues for massive spectroscopic surveys for cosmology. This work was conducted in the context of the extended Baryon Oscillation Spectroscopic Survey (eBOSS), which will use simila ...

Edp Sciences S A2016

Clustering properties of g-selected galaxies at z similar to 0.8

Johan Comparat, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, David Schlegel, Ginevra Favole

Current and future large redshift surveys, as the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey (SDSS-IV/eBOSS) or the Dark Energy Spectroscopic Instrument (DESI), will use emission-line galaxies (ELGs) to probe cosmological ...

Wiley-Blackwell2016

The extended Baryon Oscillation Spectroscopic Survey: a cosmological forecast

Johan Comparat, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Yuting Wang, Hanyu Zhang

We present a science forecast for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) survey. Focusing on discrete tracers, we forecast the expected accuracy of the baryonic acoustic oscillation (BAO), the redshift-space distortion (RSD) measureme ...

Oxford Univ Press2016

SDSS-IV eBOSS emission-line galaxy pilot survey

Eduardo Sanchez, Johan Comparat, Jean-Paul Richard Kneib, Zhirui Xu, Timothée Guy Olivier Delubac, Yi Zhang, Anand Stéphane Raichoor, David Schlegel

The Sloan Digital Sky Survey IV extended Baryonic Oscillation Spectroscopic Survey (SDSS-IV/eBOSS) will observe 195 000 emission-line galaxies (ELGs) to measure the baryonic acoustic oscillation (BAO) standard ruler at redshift 0.9. To test different ELG s ...

Edp Sciences S A2016

The Sdss-Iv Extended Baryon Oscillation Spectroscopic Survey: Overview And Early Data

Johan Comparat, Pierre Laurent, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Yu Liang, Anand Stéphane Raichoor, Cheng Zhao, Yuting Wang, David Schlegel, Cheng Li, Zheng Zheng

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 simultaneous ...

Iop Publishing Ltd2016

NEAR-ULTRAVIOLET SPECTROSCOPY OF STAR-FORMING GALAXIES FROM eBOSS: SIGNATURES OF UBIQUITOUS GALACTIC-SCALE OUTFLOWS (vol 815, 48, 2015)

Johan Comparat, Jeffrey Newman, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Anand Stéphane Raichoor

Iop Publishing Ltd2016

The 0.1 < z < 1.65 evolution of the bright end of the [O II] luminosity function

Johan Richard, Johan Comparat, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Jun Ma, David Schlegel, Zhenyu Wu

We present the [O II] (lambda lambda 3729; 3726) luminosity function measured in the redshift range 0.1 < z < 1.65 with unprecedented depth and accuracy. Our measurements are based on medium resolution flux-calibrated spectra of emission line galaxies with ...

EDP Sciences2015

The Eleventh And Twelfth Data Releases Of The Sloan Digital Sky Survey: Final Data From Sdss-Iii

Johan Comparat, Pierre Laurent, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Jian Liu, David Schlegel, Yue Shen, Zheng Zheng

The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution spectrograp ...

Iop Publishing Ltd2015