%0 Journal Article %1 Chang2010 %A Chang, Tzu-Ching %A Pen, Ue-Li %A Bandura, Kevin %A Peterson, Jeffrey B. %D 2010 %I Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. %J Nature %K astrophysics %N 7305 %P 463--465 %R 10.1038/nature09187 %T An intensity map of hydrogen 21-cm emission at redshift z ≈ 0.8 %U http://dx.doi.org/10.1038/nature09187 %V 466 %X Observations of 21-cm radio emission by neutral hydrogen at redshifts z ≈ 0.5 to \ 2.5 are expected to provide a sensitive probe of cosmic dark energy1, 2. This is particularly true around the onset of acceleration at z ≈ 1, where traditional optical cosmology becomes very difficult because of the infrared opacity of the atmosphere. Hitherto, 21-cm emission has been detected3 only to z = 0.24. More distant galaxies generally are too faint for individual detections but it is possible to measure the aggregate emission from many unresolved galaxies in the ‘cosmic web’. Here we report a three-dimensional 21-cm intensity field at z = 0.53 to 1.12. We then co-add neutral-hydrogen (H i) emission from the volumes surrounding about 10,000 galaxies (from the DEEP2 optical galaxy redshift survey4). We detect the aggregate 21-cm glow at a significance of \ 4$\sigma$.

@article{Chang2010, abstract = {Observations of 21-cm radio emission by neutral hydrogen at redshifts z ≈ 0.5 to \ 2.5 are expected to provide a sensitive probe of cosmic dark energy1, 2. This is particularly true around the onset of acceleration at z ≈ 1, where traditional optical cosmology becomes very difficult because of the infrared opacity of the atmosphere. Hitherto, 21-cm emission has been detected3 only to z = 0.24. More distant galaxies generally are too faint for individual detections but it is possible to measure the aggregate emission from many unresolved galaxies in the ‘cosmic web’. Here we report a three-dimensional 21-cm intensity field at z = 0.53 to 1.12. We then co-add neutral-hydrogen (H i) emission from the volumes surrounding about 10,000 galaxies (from the DEEP2 optical galaxy redshift survey4). We detect the aggregate 21-cm glow at a significance of \ 4$\sigma$.}, added-at = {2010-07-23T07:14:55.000+0200}, author = {Chang, Tzu-Ching and Pen, Ue-Li and Bandura, Kevin and Peterson, Jeffrey B.}, biburl = {https://www.bibsonomy.org/bibtex/2e36a68b327700f1d67d18cb8e5c4a059/richterek}, doi = {10.1038/nature09187}, interhash = {ee86b0398680cf0aa1d254392324e430}, intrahash = {e36a68b327700f1d67d18cb8e5c4a059}, issn = {0028-0836}, journal = {Nature}, keywords = {astrophysics}, mendeley-tags = {astrophysics}, month = jul, number = 7305, pages = {463--465}, publisher = {Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.}, shorttitle = {Nature}, timestamp = {2010-07-23T07:14:58.000+0200}, title = {{An intensity map of hydrogen 21-cm emission at redshift z ≈ 0.8}}, url = {http://dx.doi.org/10.1038/nature09187}, volume = 466, year = 2010 }