scholarly journals Baryon acoustic oscillations at z = 2.34 from the correlations of Lyα absorption in eBOSS DR14

2019 ◽  
Vol 629 ◽  
pp. A85 ◽  
Author(s):  
Victoria de Sainte Agathe ◽  
Christophe Balland ◽  
Hélion du Mas des Bourboux ◽  
Nicolás G. Busca ◽  
Michael Blomqvist ◽  
...  
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Companion Paper ◽  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Angular Diameter Distance ◽  
Quasar Spectra ◽  
Sky Survey ◽  
Baryon Acoustic Oscillations ◽  
First Time

We measure the imprint of primordial baryon acoustic oscillations (BAOs) in the correlation function of Lyα absorption in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) and the extended BOSS (eBOSS) in Data Release 14 (DR14) of the Sloan Digital Sky Survey (SDSS)-IV. In addition to 179 965 spectra with absorption in the Lyman-α (Lyα) region, we use Lyα absorption in the Lyman-β region of 56 154 spectra for the first time. We measure the Hubble distance, DH, and the comoving angular diameter distance, DM, relative to the sound horizon at the drag epoch rd at an effective redshift z = 2.34. Using a physical model of the correlation function outside the BAO peak, we find DH(2.34)/rd = 8.86 ± 0.29 and DM(2.34)/rd = 37.41 ± 1.86, within 1σ from the flat-ΛCDM model consistent with CMB anisotropy measurements. With the addition of polynomial “broadband” terms, the results remain within one standard deviation of the CMB-inspired model. Combined with the quasar-Lyα cross-correlation measurement presented in a companion paper, the BAO measurements at z = 2.35 are within 1.7σ of the predictions of this model.

scholarly journals Baryon acoustic oscillations from the cross-correlation of Lyα absorption and quasars in eBOSS DR14

2019 ◽  
Vol 629 ◽  
pp. A86 ◽  
Author(s):  
Michael Blomqvist ◽  
Hélion du Mas des Bourboux ◽  
Nicolás G. Busca ◽  
Victoria de Sainte Agathe ◽  
James Rich ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Acoustic Oscillation ◽  
Companion Paper ◽  
Peak Position ◽  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Microwave Background ◽  
Angular Diameter Distance ◽  
Statistical Precision ◽  
Sky Survey

We present a measurement of the baryon acoustic oscillation (BAO) scale at redshift z = 2.35 from the three-dimensional correlation of Lyman-α (Lyα) forest absorption and quasars. The study uses 266 590 quasars in the redshift range 1.77 <  z <  3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 14 (DR14). The sample includes the first two years of observations by the SDSS-IV extended Baryon Oscillation Spectroscopic Survey (eBOSS), providing new quasars and re-observations of BOSS quasars for improved statistical precision. Statistics are further improved by including Lyα absorption occurring in the Lyβ wavelength band of the spectra. From the measured BAO peak position along and across the line of sight, we determined the Hubble distance DH and the comoving angular diameter distance DM relative to the sound horizon at the drag epoch rd: DH(z = 2.35)/rd = 9.20 ± 0.36 and DM(z = 2.35)/rd = 36.3 ± 1.8. These results are consistent at 1.5σ with the prediction of the best-fit spatially-flat cosmological model with the cosmological constant reported for the Planck (2016) analysis of cosmic microwave background anisotropies. Combined with the Lyα auto-correlation measurement presented in a companion paper, the BAO measurements at z = 2.34 are within 1.7σ of the predictions of this model.

scholarly journals Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4

2017 ◽  
Vol 608 ◽  
pp. A130 ◽  
Author(s):  
Hélion du Mas des Bourboux ◽  
Jean-Marc Le Goff ◽  
Michael Blomqvist ◽  
Nicolás G. Busca ◽  
Julien Guy ◽  
...  
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Peak Position ◽  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Microwave Background ◽  
Λcdm Model ◽  
Auto Correlation Function ◽  
Baryon Acoustic Oscillations ◽  
The Cross

We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Lyα-forest flux transmission at a mean redshift of z = 2.40. The measurement uses the complete Sloan Digital Sky Survey (SDSS-III) data sample: 168 889 forests and 234 367 quasars from the SDSS data release DR12. In addition to the statistical improvement on our previous study using DR11, we have implemented numerous improvements at the analysis level enabling a more accurate measurement of this cross-correlation. We have also developed the first simulations of the cross-correlation that allow us to test different aspects of our data analysis and to search for potential systematic errors in the determination of the BAO peak position. We measure the two ratios DH(z = 2.40) /rd = 9.01 ± 0.36 and DM(z = 2.40) /rd = 35.7 ± 1.7, where the errors include marginalization over the non-linear velocity of quasars and the cross-correlation of metals and quasars, among other effects. These results are within 1.8σ of the prediction of the flat-ΛCDM model describing the observed cosmic microwave background anisotropies. We combine this study with the Lyα-forest auto-correlation function, yielding DH(z = 2.40) /rd = 8.94 ± 0.22 and DM(z = 2.40) /rd = 36.6 ± 1.2, within 2.3σ of the same flat-ΛCDM model.

scholarly journals Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample

2010 ◽  
Vol 401 (4) ◽  
pp. 2148-2168 ◽  
Author(s):  
Will J. Percival ◽  
Beth A. Reid ◽  
Daniel J. Eisenstein ◽  
Neta A. Bahcall ◽  
Tamas Budavari ◽  
...  
Keyword(s):  
Survey Data ◽  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Sky Survey ◽  
Data Release ◽  
Galaxy Sample ◽  
Baryon Acoustic Oscillations

scholarly journals A 2 per cent distance toz= 0.35 by reconstructing baryon acoustic oscillations – I. Methods and application to the Sloan Digital Sky Survey

2012 ◽  
Vol 427 (3) ◽  
pp. 2132-2145 ◽  
Author(s):  
Nikhil Padmanabhan ◽  
Xiaoying Xu ◽  
Daniel J. Eisenstein ◽  
Richard Scalzo ◽  
Antonio J. Cuesta ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Sky Survey ◽  
Baryon Acoustic Oscillations

scholarly journals Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys

2021 ◽  
Vol 503 (2) ◽  
pp. 2562-2582
Author(s):  
Pauline Zarrouk ◽  
Mehdi Rezaie ◽  
Anand Raichoor ◽  
Ashley J Ross ◽  
Shadab Alam ◽  
...  
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Angular Distance ◽  
Photometric Data ◽  
Cross Correlation Function ◽  
Network Approach ◽  
Acoustic Oscillations ◽  
Neural Network Approach ◽  
Baryon Acoustic Oscillations ◽  
Line Galaxy

ABSTRACT We search for the baryon acoustic oscillations in the projected cross-correlation function binned into transverse comoving radius between the SDSS-IV DR16 eBOSS quasars and a dense photometric sample of galaxies selected from the DESI Legacy Imaging Surveys. We estimate the density of the photometric sample of galaxies in this redshift range to be about 2900 deg−2, which is deeper than the official DESI emission line galaxy selection, and the density of the spectroscopic sample is about 20 deg−2. In order to mitigate the systematics related to the use of different imaging surveys close to the detection limit, we use a neural network approach that accounts for complex dependences between the imaging attributes and the observed galaxy density. We find that we are limited by the depth of the imaging surveys that affects the density and purity of the photometric sample and its overlap in redshift with the quasar sample, which thus affects the performance of the method. When cross-correlating the photometric galaxies with quasars in the range 0.6 ≤ z ≤ 1.2, the cross-correlation function can provide better constraints on the comoving angular distance DM (6 per cent precision) compared to the constraint on the spherically averaged distance DV (9 per cent precision) obtained from the autocorrelation. Although not yet competitive, this technique will benefit from the arrival of deeper photometric data from upcoming surveys that will enable it to go beyond the current limitations we have identified in this work.

scholarly journals Erratum: Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample

2011 ◽  
Vol 417 (4) ◽  
pp. 3101-3102 ◽  
Author(s):  
◽  
Will J. Percival ◽  
Beth A. Reid ◽  
Daniel J. Eisenstein ◽  
Neta A. Bahcall ◽  
...  
Keyword(s):  
Survey Data ◽  
Sloan Digital Sky Survey ◽  
Acoustic Oscillations ◽  
Sky Survey ◽  
Data Release ◽  
Galaxy Sample ◽  
Baryon Acoustic Oscillations

scholarly journals Searching for Mg ii absorbers in and around galaxy clusters

2021 ◽  
Vol 503 (3) ◽  
pp. 4309-4319
Author(s):  
Jong Chul Lee ◽  
Ho Seong Hwang ◽  
Hyunmi Song
Keyword(s):  
Galaxy Clusters ◽  
Detection Rate ◽  
Massive Star ◽  
Sloan Digital Sky Survey ◽  
Number Density ◽  
Cluster Galaxies ◽  
Star Forming ◽  
Quasar Spectra ◽  
Sky Survey ◽  
The Galaxy

ABSTRACT To study environmental effects on the circumgalactic medium (CGM), we use the samples of redMaPPer galaxy clusters, background quasars, and cluster galaxies from the Sloan Digital Sky Survey (SDSS). With ∼82 000 quasar spectra, we detect 197 Mg ii absorbers in and around the clusters. The detection rate per quasar is 2.7 ± 0.7 times higher inside the clusters than outside the clusters, indicating that Mg ii absorbers are relatively abundant in clusters. However, when considering the galaxy number density, the absorber-to-galaxy ratio is rather low inside the clusters. If we assume that Mg ii absorbers are mainly contributed by the CGM of massive star-forming galaxies, a typical halo size of cluster galaxies is smaller than that of field galaxies by 30 ± 10 per cent. This finding supports that galaxy haloes can be truncated by interaction with the host cluster.

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