%0 Generic %1 krolewski2017detection %A Krolewski, Alex %A Lee, Khee-Gan %A White, Martin %A Hennawi, Joseph %A Schlegel, David J. %A Nugent, Peter E. %A Lukić, Zarija %A Stark, Casey W. %A Fèvre, Olivier Le %A Lemaux, Brian C. %A Maier, Christian %A Salvato, Mara %A Tasca, Lidia %D 2017 %K detection tomography void %T A Detection of $z$~2.3 Cosmic Voids from 3D Lyman-$\alpha$ Forest Tomography in the COSMOS Field %U http://arxiv.org/abs/1710.02612 %X We present the most distant detection of cosmic voids ($z 2.3$) and the first detection of three-dimensional voids in the Lyman-$\alpha$ forest using the 3D tomographic map from the CLAMATO survey. Using the LRIS spectrograph on the 10.3m Keck-I telescope, CLAMATO obtained moderate-resolution spectra from 240 background Lyman-break galaxies and quasars in a 26.6' by 21.3' section of the COSMOS field to reconstruct the Ly$\alpha$ absorption field on 2.5 $h^-1$ Mpc scales over a comoving volume of $3.15 10^5$ $h^-3$ Mpc$^3$. We detect voids using a spherical overdensity finder with thresholds calibrated from hydrodynamical simulations of the intergalactic medium. We find that the same thresholds produce a consistent volume fraction of voids in both data (19.1%) and simulations (18.1%). We fit the void radius function using excursion set models at $z 2.3$ and we compare the two-dimensional and radially averaged stacked profiles of large voids ($r > 5$ $h^-1$ Mpc) to stacked voids in mock observations and the simulated density field. Finally, using 432 coeval galaxies in the same volume as the IGM map, we find that the tomography-identified voids are underdense in galaxies by 5.91$\sigma$ compared to random cells.

@misc{krolewski2017detection, abstract = {We present the most distant detection of cosmic voids ($z \sim 2.3$) and the first detection of three-dimensional voids in the Lyman-$\alpha$ forest using the 3D tomographic map from the CLAMATO survey. Using the LRIS spectrograph on the 10.3m Keck-I telescope, CLAMATO obtained moderate-resolution spectra from 240 background Lyman-break galaxies and quasars in a 26.6' by 21.3' section of the COSMOS field to reconstruct the Ly$\alpha$ absorption field on 2.5 $h^{-1}$ Mpc scales over a comoving volume of $3.15 \times 10^5$ $h^{-3}$ Mpc$^3$. We detect voids using a spherical overdensity finder with thresholds calibrated from hydrodynamical simulations of the intergalactic medium. We find that the same thresholds produce a consistent volume fraction of voids in both data (19.1%) and simulations (18.1%). We fit the void radius function using excursion set models at $z \sim 2.3$ and we compare the two-dimensional and radially averaged stacked profiles of large voids ($r > 5$ $h^{-1}$ Mpc) to stacked voids in mock observations and the simulated density field. Finally, using 432 coeval galaxies in the same volume as the IGM map, we find that the tomography-identified voids are underdense in galaxies by 5.91$\sigma$ compared to random cells.}, added-at = {2017-10-10T10:01:00.000+0200}, author = {Krolewski, Alex and Lee, Khee-Gan and White, Martin and Hennawi, Joseph and Schlegel, David J. and Nugent, Peter E. and Lukić, Zarija and Stark, Casey W. and Fèvre, Olivier Le and Lemaux, Brian C. and Maier, Christian and Salvato, Mara and Tasca, Lidia}, biburl = {https://www.bibsonomy.org/bibtex/270d8622f48dc85a304a3fde42baa416b/miki}, description = {[1710.02612] A Detection of $z$~2.3 Cosmic Voids from 3D Lyman-$\alpha$ Forest Tomography in the COSMOS Field}, interhash = {16b0f5ec5864ffdfd6170d77ce60e5c8}, intrahash = {70d8622f48dc85a304a3fde42baa416b}, keywords = {detection tomography void}, note = {cite arxiv:1710.02612Comment: 18 pages, 9 figures, to be submitted to ApJ}, timestamp = {2017-10-10T10:01:00.000+0200}, title = {A Detection of $z$~2.3 Cosmic Voids from 3D Lyman-$\alpha$ Forest Tomography in the COSMOS Field}, url = {http://arxiv.org/abs/1710.02612}, year = 2017 }