The Lyman Continuum Escape Fraction of Star-forming Galaxies at $2.4\lesssim z\lesssim3.0$ from UVCANDELS
Creators: name: Wang, Xin
name: Teplitz, Harry I.
name: Smith, Brent M.
name: Windhorst, Rogier A.
name: Rafelski, Marc
name: Mehta, Vihang
name: Alavi, Anahita
name: Brammer, Gabriel
name: Colbert, James
name: Grogin, Norman
name: Hathi, Nimish P.
name: Koekemoer, Anton M.
name: Prichard, Laura
name: Scarlata, Claudia
name: Sunnquist, Ben
name: Haro, Pablo Arrabal
name: Conselice, Christopher
name: Gawiser, Eric
name: Guo, Yicheng
name: Hayes, Matthew
name: Jansen, Rolf A.
name: Ji, Zhiyuan
name: Lucas, Ray A.
name: O'Connell, Robert
name: Robertson, Brant
name: Rutkowski, Michael
name: Siana, Brian
name: Vanzella, Eros
name: Ashcraft, Teresa
name: Bagley, Micaela
name: Baronchelli, Ivano
name: Barro, Guillermo
name: Blanche, Alex
name: Broussard, Adam
name: Carleton, Timothy
name: Chartab, Nima
name: Cheng, Yingjie
name: Codoreanu, Alex
name: Cohen, Seth
name: Dai, Y. Sophia
name: Darvish, Behnam
name: Dave, Romeel
name: DeGroot, Laura
name: De Mello, Duilia
name: Dickinson, Mark
name: Emami, Najmeh
name: Ferguson, Henry
name: Ferreira, Leonardo
name: Finkelstein, Keely
name: Finkelstein, Steven
name: Gardner, Jonathan P.
name: Gburek, Timothy
name: Giavalisco, Mauro
name: Grazian, Andrea
name: Gronwall, Caryl
name: Hemmati, Shoubaneh
name: Howell, Justin
name: Iyer, Kartheik
name: Kaviraj, Sugata
name: Kurczynski, Peter
name: Lazar, Ilin
name: MacKenty, John
name: Mantha, Kameswara Bharadwaj
name: Martin, Alec
name: Martin, Garreth
name: McCabe, Tyler
name: Mobasher, Bahram
name: Nedkova, Kalina
name: Olsen, Charlotte
name: Otteson, Lillian
name: Ravindranath, Swara
name: Redshaw, Caleb
name: Sattari, Zahra
name: Soto, Emmaris
name: Yung, L. Y. Aaron
name: Zabelle, Bonnabelle
name: team, the UVCANDELS
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 ($f_{\rm esc}^{\rm abs}$) of Lyman continuum (LyC) radiation through stacking the UV images of a population of star-forming galaxies with secure redshifts at $2.4\leq z\leq3.0$. 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 (MC) simulations of the intergalactic medium (IGM) attenuation, to take into account the sample variance of the mean IGM transmission when measuring $f_{\rm esc}^{\rm abs}$. The full stack at $z\approx2.44$ from 28 galaxies places a stringent 1-$σ$ upper limit of $f_{\rm esc}^{\rm abs}\lesssim5\%$, whereas the full stack at $z\approx2.72$ of equal number of galaxies gives an upper limit of $f_{\rm esc}^{\rm abs}\lesssim26\%$ at 1-$σ$ 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 (MAST).
description: 28 pages, 7 figures, and 4 tables. Accepted to ApJ