Abstract
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits of primary Wide-Field Camera 3 Ultraviolet and VISible light F275W imaging with coordinated parallel Advanced Camera for Surveys F435W imaging, on four of the five premier extragalactic survey fields: GOODS-N, GOODS-S, EGS, and COSMOS. We introduce this survey by presenting a comprehensive analysis of the absolute escape fraction ( f esc abs ) of Lyman continuum radiation through stacking the UV images of a population of star-forming galaxies with secure redshifts at 2.4 ≤ z ≤ 3.0. Our stacking benefits from the catalogs of high-quality spectroscopic redshifts compiled from archival ground-based data and HST slitless spectroscopy, carefully vetted by dedicated visual inspection efforts. We develop a robust stacking method to apply to 10 samples of in total 56 galaxies, and perform detailed Monte Carlo simulations of the intergalactic medium (IGM) attenuation, to take into account the sample variance of the mean IGM transmission when measuring f esc abs . The full stack at z ≈ 2.44 from 28 galaxies places a stringent 1σ upper limit of f esc abs ≲ 5 % , whereas the full stack at z ≈ 2.72 of an equal number of galaxies gives an upper limit of f esc abs ≲ 26 % at 1σ confidence level. These new F275W and F435W imaging mosaics from UVCANDELS have been made publicly available on the Barbara A. Mikulski Archive for Space Telescopes.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 74 |
| Tidsskrift | Astrophysical Journal |
| Vol/bind | 980 |
| Udgave nummer | 1 |
| Antal sider | 22 |
| ISSN | 0004-637X |
| DOI | |
| Status | Udgivet - 5 feb. 2025 |
Bibliografisk note
Funding Information:We would like to thank the anonymous referee for their very useful comments that helped improve the clarity of this paper. X.W. is supported by the National Natural Science Foundation of China (grant No. 12373009), the CAS Project for Young Scientists in Basic Research grant No. YSBR-062, the Fundamental Research Funds for the Central Universities, the Xiaomi Young Talents Program, and a science research grant from the China Manned Space Project. X.W. acknowledges work carried out, in part, at the Swinburne University of Technology, sponsored by the ACAMAR visiting fellowship, and the hospitality of the International Centre of Supernovae (ICESUN), Yunnan Key Laboratory at Yunnan Observatories, Chinese Academy of Sciences. This work is based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. Support for program No. HST-GO-15647 was provided through a grant from the STScI under NASA contract NAS5-26555. X.W. acknowledges work carried out, in part, by IPAC at the California Institute of Technology, and was sponsored by the National Aeronautics and Space Administration. R.A.W. acknowledges support from NASA JWST Interdisciplinary Scientist grants NAG5-12460, NNX14AN10G, and 80NSSC18K0200 from GSFC. We thank A. Barger and N. Reddy for providing reduced spectra of their Keck observations, which were useful for our visual inspection efforts. We acknowledge A. Inoue for providing the line-of-sight Monte Carlo IGM transmission code.
Publisher Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.