%0 Generic %1 delubac2014baryon %A Delubac, Timothée %A Bautista, Julian E. %A Busca, Nicolás G. %A Rich, James %A Kirkby, David %A Bailey, Stephen %A Font-Ribera, Andreu %A Slosar, Anže %A Lee, Khee-Gan %A Pieri, Matthew M. %A Hamilton, Jean-Christophe %A Aubourg, Éric %A Blomqvist, Michael %A Bovy, Jo %A Brinkmann, J. %A Carithers, William %A Dawson, Kyle S. %A Eisenstein, Daniel J. %A Kneib, Jean-Paul %A Goff, J. M. Le %A Margala, Daniel %A Miralda-Escudé, Jordi %A Myers, Adam D. %A Nichol, Robert C. %A Noterdaeme, Pasquier %A O'Connell, Ross %A Olmstead, Matthew D. %A Palanque-Delabrouille, Nathalie %A Pâris, Isabelle %A Petitjean, Patrick %A Ross, Nicholas P. %A Rossi, Graziano %A Schlegel, David J. %A Schneider, Donald P. %A Weinberg, David H. %A Yèche, Christophe %A York, Donald G. %D 2014 %K bao lya quasar %T Baryon Acoustic Oscillations in the Ly\alpha forest of BOSS DR11 quasars %U http://arxiv.org/abs/1404.1801 %X We report a detection of the baryon acoustic oscillation (BAO) feature in the flux-correlation function of the Ly\alpha forest of high-redshift quasars with a statistical significance of five standard deviations. The study uses 137,562 quasars in the redshift range $2.1z 3.5$ from the Data Release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III. This sample contains three times the number of quasars used in previous studies. The measured position of the BAO peak determines the angular distance, $D_A(z=2.34)$ and expansion rate, $H(z=2.34)$, both on a scale set by the sound horizon at the drag epoch, $r_d$. We find $D_A/r_d=11.28\pm0.65(1\sigma)^+2.8_-1.2(2\sigma)$ and $D_H/r_d=9.18\pm0.28(1\sigma)\pm0.6(2\sigma)$ where $D_H=c/H$. The optimal combination, $D_H^0.7D_A^0.3/r_d$ is determined with a precision of $\sim2\%$. For the value $r_d=147.4~Mpc$, consistent with the CMB power spectrum measured by Planck, we find $D_A(z=2.34)=1662\pm96(1\sigma)~Mpc$ and $H(z=2.34)=222\pm7(1\sigma)~km\,s^-1Mpc^-1$. Tests with mock catalogs and variations of our analysis procedure have revealed no systematic uncertainties comparable to our statistical errors. Our results agree with the previously reported BAO measurement at the same redshift using the quasar-Ly\alpha forest cross-correlation. The auto-correlation and cross-correlation approaches are complementary because of the quite different impact of redshift-space distortion on the two measurements. The combined constraints from the two correlation functions imply values of $D_A/r_d$ and $D_H/r_d$ that are, respectively, 7% low and 7% high compared to the predictions of a flat $Łambda$CDM cosmological model with the best-fit Planck parameters. With our estimated statistical errors, the significance of this discrepancy is $2.5\sigma$.

@misc{delubac2014baryon, abstract = {We report a detection of the baryon acoustic oscillation (BAO) feature in the flux-correlation function of the Ly{\alpha} forest of high-redshift quasars with a statistical significance of five standard deviations. The study uses 137,562 quasars in the redshift range $2.1\le z \le 3.5$ from the Data Release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III. This sample contains three times the number of quasars used in previous studies. The measured position of the BAO peak determines the angular distance, $D_A(z=2.34)$ and expansion rate, $H(z=2.34)$, both on a scale set by the sound horizon at the drag epoch, $r_d$. We find $D_A/r_d=11.28\pm0.65(1\sigma)^{+2.8}_{-1.2}(2\sigma)$ and $D_H/r_d=9.18\pm0.28(1\sigma)\pm0.6(2\sigma)$ where $D_H=c/H$. The optimal combination, $\sim D_H^{0.7}D_A^{0.3}/r_d$ is determined with a precision of $\sim2\%$. For the value $r_d=147.4~{\rm Mpc}$, consistent with the CMB power spectrum measured by Planck, we find $D_A(z=2.34)=1662\pm96(1\sigma)~{\rm Mpc}$ and $H(z=2.34)=222\pm7(1\sigma)~{\rm km\,s^{-1}Mpc^{-1}}$. Tests with mock catalogs and variations of our analysis procedure have revealed no systematic uncertainties comparable to our statistical errors. Our results agree with the previously reported BAO measurement at the same redshift using the quasar-Ly{\alpha} forest cross-correlation. The auto-correlation and cross-correlation approaches are complementary because of the quite different impact of redshift-space distortion on the two measurements. The combined constraints from the two correlation functions imply values of $D_A/r_d$ and $D_H/r_d$ that are, respectively, 7% low and 7% high compared to the predictions of a flat $\Lambda$CDM cosmological model with the best-fit Planck parameters. With our estimated statistical errors, the significance of this discrepancy is $\approx 2.5\sigma$.}, added-at = {2014-04-08T09:38:53.000+0200}, author = {Delubac, Timothée and Bautista, Julian E. and Busca, Nicolás G. and Rich, James and Kirkby, David and Bailey, Stephen and Font-Ribera, Andreu and Slosar, Anže and Lee, Khee-Gan and Pieri, Matthew M. and Hamilton, Jean-Christophe and Aubourg, Éric and Blomqvist, Michael and Bovy, Jo and Brinkmann, J. and Carithers, William and Dawson, Kyle S. and Eisenstein, Daniel J. and Kneib, Jean-Paul and Goff, J. M. Le and Margala, Daniel and Miralda-Escudé, Jordi and Myers, Adam D. and Nichol, Robert C. and Noterdaeme, Pasquier and O'Connell, Ross and Olmstead, Matthew D. and Palanque-Delabrouille, Nathalie and Pâris, Isabelle and Petitjean, Patrick and Ross, Nicholas P. and Rossi, Graziano and Schlegel, David J. and Schneider, Donald P. and Weinberg, David H. and Yèche, Christophe and York, Donald G.}, biburl = {https://www.bibsonomy.org/bibtex/255dc0873824d332715b827130893d81e/miki}, description = {[1404.1801] Baryon Acoustic Oscillations in the Ly{\alpha} forest of BOSS DR11 quasars}, interhash = {f9322bb3aa9aeadb13c6e919dca3f8d2}, intrahash = {55dc0873824d332715b827130893d81e}, keywords = {bao lya quasar}, note = {cite arxiv:1404.1801Comment: to be submitted to A&A. 17 pages, 18 figures}, timestamp = {2014-04-08T09:38:53.000+0200}, title = {Baryon Acoustic Oscillations in the Ly{\alpha} forest of BOSS DR11 quasars}, url = {http://arxiv.org/abs/1404.1801}, year = 2014 }