TY - JOUR
T1 - Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOODS-N field
AU - Iwata, Ikuru
AU - Inoue, Akio K.
AU - Micheva, Genoveva
AU - Matsuda, Yuichi
AU - Yamada, Toru
N1 - Funding Information:
IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. This research made use of ASTROPY, a community-developed core PYTHON package for Astronomy.
Funding Information:
Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Proposal IDs: S11A-016, S15A-019, S18A-042. The authors thank staff members of the Subaru Telescope and the Subaru Mitaka Office for their support, and the anonymous referee for careful reading of the manuscript and constructive suggestions. II acknowledges Dr. Naveen Reddy and the MOSDEF team for providing near-infrared spectra of an object used in this study. He also thanks Dr. Chuck Steidel for providing us with a Keck/LRIS spectrum of a galaxy, and Dr. Marcin Sawicki for arranging a comfortable work environment for him during the analyses of the present research. This work was supported byJSPS KAKENHI Grant Numbers 18740114, 24244018, and 17H0114. Some of the archived data collected at the Subaru Telescope are obtained from SMOKA, which is operated by the Astronomy Data Center, National Astronomical Observatory of Japan, and STARS (Subaru Telescope Archive System) operated by the Subaru Telescope. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This research partly uses the database of the Sloan Digital Sky Survey (SDSS). Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS website is http://www.sdss.org/. IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. This research made use of ASTROPY, a community-developed core PYTHON package for Astronomy. We wish to express our gratitude to the indigenous Hawaiian community for their understanding of the significant role of the summit of Maunakea in astronomical research.
Funding Information:
Some of the archived data collected at the Subaru Telescope are obtained from SMOKA, which is operated by the Astronomy Data Center, National Astronomical Observatory of Japan, and STARS (Subaru Telescope Archive System) operated by the Subaru Telescope. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This research partly uses the database of the Sloan Digital Sky Survey (SDSS). Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS website is http://www.sdss.org/.
Funding Information:
This work was supported byJSPS KAKENHI Grant Numbers 18740114, 24244018, and 17H0114.
Publisher Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
PY - 2019/10/1
Y1 - 2019/10/1
N2 - We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 and 157 photometrically selected z = 3.1 Lyman α emitter (LAE) candidates as the targets. After removing galaxies spectroscopically confirmed to be contaminated by foreground sources, we found two SFGs and one AGN as candidate LyC-emitting sources among the targets with spectroscopic redshifts. Among LAE candidates, five sources are detected in the NB359 image, and three among them may be contaminated by foreground sources. We compare the sample galaxies in the GOODS-N with those in the SSA22, where a prominent protocluster at z = 3.1 is known and an LyC search using the same NB359 filter has been made. The frequency of galaxies with LyC leakage in the SSA22 field may be about two times higher than that of galaxies in the GOODS-N with the sample ultraviolet (UV) magnitude range, although the numbers of LyC detections in these fields are too small to make a statistically significant conclusion. By combining the sample galaxies in these fields, we place the 3σ upper limits of the observed LyC-to-UV flux density ratio and LyC escape fraction for galaxies at z = 3.1 with absolute UV magnitude MUV < −18.8 as (fLyC/fUV)obs < 0.036 and fescabs < 8 per cent, respectively.
AB - We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 and 157 photometrically selected z = 3.1 Lyman α emitter (LAE) candidates as the targets. After removing galaxies spectroscopically confirmed to be contaminated by foreground sources, we found two SFGs and one AGN as candidate LyC-emitting sources among the targets with spectroscopic redshifts. Among LAE candidates, five sources are detected in the NB359 image, and three among them may be contaminated by foreground sources. We compare the sample galaxies in the GOODS-N with those in the SSA22, where a prominent protocluster at z = 3.1 is known and an LyC search using the same NB359 filter has been made. The frequency of galaxies with LyC leakage in the SSA22 field may be about two times higher than that of galaxies in the GOODS-N with the sample ultraviolet (UV) magnitude range, although the numbers of LyC detections in these fields are too small to make a statistically significant conclusion. By combining the sample galaxies in these fields, we place the 3σ upper limits of the observed LyC-to-UV flux density ratio and LyC escape fraction for galaxies at z = 3.1 with absolute UV magnitude MUV < −18.8 as (fLyC/fUV)obs < 0.036 and fescabs < 8 per cent, respectively.
KW - Cosmology: observations
KW - Galaxies: evolution
KW - Galaxies: high-redshift
KW - Intergalactic medium
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U2 - 10.1093/mnras/stz2081
DO - 10.1093/mnras/stz2081
M3 - Article
AN - SCOPUS:85083190730
SN - 0035-8711
VL - 488
SP - 5671
EP - 5689
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -