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The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters

Flury, Sophia R. and Jaskot, Anne E. and Ferguson, Harry C. and Worseck, Gábor and Makan, Kirill and Chisholm, John and Saldana-Lopez, Alberto and Schaerer, Daniel and McCandliss, Stephan and Wang, Bingjie and Ford, N. M. and Heckman, Timothy and Ji, Zhiyuan and Giavalisco, Mauro and Amorin, Ricardo and Atek, Hakim and Blaizot, Jeremy and Borthakur, Sanchayeeta and Carr, Cody and Castellano, Marco and Cristiani, Stefano and De Barros, Stephane and Dickinson, Mark and Finkelstein, Steven L. and Fleming, Brian and Fontanot, Fabio and Garel, Thibault and Grazian, Andrea and Hayes, Matthew and Henry, Alaina and Mauerhofer, Valentin and Micheva, Genoveva and Oey, M. S. and Ostlin, Goran and Papovich, Casey and Pentericci, Laura and Ravindranath, Swara and Rosdahl, Joakim and Rutkowski, Michael and Santini, Paola and Scarlata, Claudia and Teplitz, Harry and Thuan, Trinh and Trebitsch, Maxime and Vanzella, Eros and Verhamme, Anne and Xu, Xinfeng (2022) The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters. Astrophysical Journal Supplement Series, 260 (1). Art. No. 1. ISSN 0067-0049. doi:10.3847/1538-4365/ac5331.

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The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics to infer the rate at which galaxies contribute LyC photons to reionize the universe by studying lower-redshift analogs. We present the Low-redshift Lyman Continuum Survey (LzLCS) comprising measurements made with the Hubble Space Telescope Cosmic Origins Spectrograph for a z = 0.2–0.4 sample of 66 galaxies. After careful processing of the far-UV spectra, we obtain a total of 35 Lyman continuum emitters (LCEs) detected with 97.725% confidence, nearly tripling the number of known local LCEs. We estimate escape fractions from the detected LyC flux and upper limits on the undetected LyC flux, finding a range of LyC escape fractions up to 50%. Of the 35 LzLCS LCEs, 12 have LyC escape fractions greater than 5%, more than doubling the number of known local LCEs with cosmologically relevant LyC escape.

Item Type:Article
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URLURL TypeDescription Paper
Flury, Sophia R.0000-0002-0159-2613
Jaskot, Anne E.0000-0002-6790-5125
Ferguson, Harry C.0000-0001-7113-2738
Worseck, Gábor0000-0003-0960-3580
Makan, Kirill0000-0003-3157-1191
Chisholm, John0000-0002-0302-2577
Saldana-Lopez, Alberto0000-0001-8419-3062
Schaerer, Daniel0000-0001-7144-7182
McCandliss, Stephan0000-0003-0503-4667
Wang, Bingjie0000-0001-9269-5046
Ford, N. M.0000-0001-8921-3624
Heckman, Timothy0000-0001-6670-6370
Ji, Zhiyuan0000-0001-7673-2257
Giavalisco, Mauro0000-0002-7831-8751
Amorin, Ricardo0000-0001-5758-1000
Atek, Hakim0000-0002-7570-0824
Blaizot, Jeremy0000-0003-1609-7911
Borthakur, Sanchayeeta0000-0002-2724-8298
Carr, Cody0000-0003-4166-2855
Castellano, Marco0000-0001-9875-8263
Cristiani, Stefano0000-0002-2115-5234
De Barros, Stephane0000-0002-5877-8793
Dickinson, Mark0000-0001-5414-5131
Finkelstein, Steven L.0000-0001-8519-1130
Fleming, Brian0000-0002-2129-0292
Fontanot, Fabio0000-0003-4744-0188
Garel, Thibault0000-0002-9613-9044
Grazian, Andrea0000-0002-5688-0663
Hayes, Matthew0000-0001-8587-218X
Henry, Alaina0000-0002-6586-4446
Mauerhofer, Valentin0000-0003-0595-9483
Micheva, Genoveva0000-0003-4376-2841
Oey, M. S.0000-0002-5808-1320
Ostlin, Goran0000-0002-3005-1349
Papovich, Casey0000-0001-7503-8482
Pentericci, Laura0000-0001-8940-6768
Ravindranath, Swara0000-0002-5269-6527
Rosdahl, Joakim0000-0002-7534-8314
Rutkowski, Michael0000-0001-7016-5220
Santini, Paola0000-0002-9334-8705
Scarlata, Claudia0000-0002-9136-8876
Teplitz, Harry0000-0002-7064-5424
Trebitsch, Maxime0000-0002-6849-5375
Vanzella, Eros0000-0002-5057-135X
Verhamme, Anne0000-0002-2201-1865
Xu, Xinfeng0000-0002-9217-7051
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 August 5; revised 2021 December 14; accepted 2022 January 7; published 2022 April 21. We thank the anonymous referee for feedback that improved the clarity of this paper. Support for this work was provided by NASA through grant No. HST-GO-15626 from the Space Telescope Science Institute. Additional work was based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute from HST proposals 13744, 14635, 15341, and 15639. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration. R.A. acknowledges support from ANID Fondecyt Regular 1202007. Software: astropy (Astropy Collaboration et al. 2013, 2018), bpass (Stanway & Eldridge 2018), calcos, Cloudy (Ferland et al. 2013), emcee (Foreman-Mackey et al. 2013), FaintCOS (Worseck et al. 2016; Makan et al. 2021), matplotlib (Hunter 2007), numpy (van der Walt et al. 2011), Prospector (Leja et al. 2017; Johnson et al. 2019), pyneb (Luridiana et al. 2015), scipy (Virtanen et al. 2020), Starburst99 (Leitherer et al. 1999, 2010, 2014).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 5-26555
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Participating InstitutionsUNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1202007
Subject Keywords:Reionization; Galactic and extragalactic astronomy; Ultraviolet astronomy; Hubble Space Telescope
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Reionization (1383); Galactic and extragalactic astronomy (563); Ultraviolet astronomy (1736); Hubble Space Telescope (761)
Record Number:CaltechAUTHORS:20220623-707897200
Persistent URL:
Official Citation:Sophia R. Flury et al 2022 ApJS 260 1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115250
Deposited By: Tony Diaz
Deposited On:24 Jun 2022 22:49
Last Modified:28 Jun 2022 19:22

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