TY - JOUR
T1 - The SSA22 H i Tomography Survey (SSA22-HIT). I. Data Set and Compiled Redshift Catalog
AU - Mawatari, Ken
AU - Inoue, Akio K.
AU - Yamada, Toru
AU - Hayashino, Tomoki
AU - Prochaska, J. Xavier
AU - Lee, Khee Gan
AU - Tejos, Nicolas
AU - Kashikawa, Nobunari
AU - Otsuka, Takuya
AU - Yamanaka, Satoshi
AU - Schlegel, David J.
AU - Matsuda, Yuichi
AU - Hennawi, Joseph F.
AU - Iwata, Ikuru
AU - Umehata, Hideki
AU - Mukae, Shiro
AU - Ouchi, Masami
AU - Sugahara, Yuma
AU - Tamura, Yoichi
N1 - Funding Information:
K.M. acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) through KAKENHI grant No. 20K14516. K.M. and A.K.I. are supported by JSPS KAKENHI grant Nos. 26287034 and 17H01114. H.U. is supported by JSPS Grant-in-Aid for Research Activity Start-up (16H06713) and KAKENHI grant No. 20H01953. This work was partially supported by the joint research program of the Institute for Cosmic Ray Research (ICRR), University of Tokyo. This work is supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, as well as KAKENHI Grant-in-Aid for Scientific Research (A) (15H02064 and 19H00697) through the JSPS. We thank Kohei Shinoka, Marc Kassis, Joel Aycock, Heather Hershley, and Jim Lyke for their help during the observations with the Keck/DEIMOS. We also thank Hassen M. Yesuf and Mariko Kubo for their advice in the data reduction. We thank the anonymous referee for providing constructive comments that significantly improved the clarity of the paper. Data analysis was in part carried out on the Multi-wavelength Data Analysis System operated by the Astronomy Data Center (ADC), National Astronomical Observatory of Japan. We would like to thank Editage (www.editage.com) for English language editing. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration (NASA). The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. Some of our observations with the Keck/DEIMOS were carried out under the time-exchange program between the Subaru and the Keck telescopes. The Subaru telescope is operated by the National Astronomical Observatory of Japan. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community.
Funding Information:
K.M. acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) through KAKENHI grant No. 20K14516. K.M. and A.K.I. are supported by JSPS KAKENHI grant Nos. 26287034 and 17H01114. H.U. is supported by JSPS Grant-in-Aid for Research Activity Start-up (16H06713) and KAKENHI grant No. 20H01953. This work was partially supported by the joint research program of the Institute for Cosmic Ray Research (ICRR), University of Tokyo. This work is supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, as well as KAKENHI Grant-in-Aid for Scientific Research (A) (15H02064 and 19H00697) through the JSPS. We thank Kohei Shinoka, Marc Kassis, Joel Aycock, Heather Hershley, and Jim Lyke for their help during the observations with the Keck/DEIMOS. We also thank Hassen M. Yesuf and Mariko Kubo for their advice in the data reduction. We thank the anonymous referee for providing constructive comments that significantly improved the clarity of the paper. Data analysis was in part carried out on the Multi-wavelength Data Analysis System operated by the Astronomy Data Center (ADC), National Astronomical Observatory of Japan. We would like to thank Editage ( www.editage.com ) for English language editing. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration (NASA). The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. Some of our observations with the Keck/DEIMOS were carried out under the time-exchange program between the Subaru and the Keck telescopes. The Subaru telescope is operated by the National Astronomical Observatory of Japan. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community.
Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/5/1
Y1 - 2023/5/1
N2 - We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographically map high-z H i gas through analysis of Lyα absorption in background galaxies’ spectra. In total, 198 galaxies were spectroscopically confirmed at 2.5 < z < 6 with a few low-z exceptions in the 26 × 15 arcmin2 area, of which 148 were newly determined in this study. Our redshift measurements were merged with previously confirmed redshifts available in the 34 × 27 arcmin2 area of the SSA22 field. This compiled catalog containing 730 galaxies of various types at z > 2 is useful for various applications, and it is made publicly available. Our SSA22-HIT survey has increased by approximately twice the number of spectroscopic redshifts of sources at z > 3.2 in the observed field. From a comparison with publicly available redshift catalogs, we show that our compiled redshift catalog in the SSA22 field is comparable to those among major extragalactic survey fields in terms of a combination of wide area and high surface number density of objects at z > 2. About 40% of the spectroscopically confirmed objects in SSA22-HIT show reasonable quality of spectra in the wavelengths shorter than Lyα when a sufficient amount of smoothing is adopted. Our data set enables us to make the H i tomographic map at z ≳ 3, which we present in a parallel study.
AB - We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographically map high-z H i gas through analysis of Lyα absorption in background galaxies’ spectra. In total, 198 galaxies were spectroscopically confirmed at 2.5 < z < 6 with a few low-z exceptions in the 26 × 15 arcmin2 area, of which 148 were newly determined in this study. Our redshift measurements were merged with previously confirmed redshifts available in the 34 × 27 arcmin2 area of the SSA22 field. This compiled catalog containing 730 galaxies of various types at z > 2 is useful for various applications, and it is made publicly available. Our SSA22-HIT survey has increased by approximately twice the number of spectroscopic redshifts of sources at z > 3.2 in the observed field. From a comparison with publicly available redshift catalogs, we show that our compiled redshift catalog in the SSA22 field is comparable to those among major extragalactic survey fields in terms of a combination of wide area and high surface number density of objects at z > 2. About 40% of the spectroscopically confirmed objects in SSA22-HIT show reasonable quality of spectra in the wavelengths shorter than Lyα when a sufficient amount of smoothing is adopted. Our data set enables us to make the H i tomographic map at z ≳ 3, which we present in a parallel study.
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U2 - 10.3847/1538-3881/acb707
DO - 10.3847/1538-3881/acb707
M3 - Article
AN - SCOPUS:85153473681
SN - 0004-6256
VL - 165
JO - Astronomical Journal
JF - Astronomical Journal
IS - 5
M1 - 208
ER -