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The Low-redshift Lyman Continuum Survey. II. New Insights into LyC Diagnostics

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 R. and Xu, Xinfeng and Wang, Bingjie and Oey, M. S. and Ford, N. M. and Heckman, Timothy and Ji, Zhiyuan and Giavalisco, Mauro and Amorín, Ricardo and Atek, Hakim and Blaizot, Jeremy and Borthakur, Sanchayeeta and Carr, Cody and Castellano, Marco 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 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 (2022) The Low-redshift Lyman Continuum Survey. II. New Insights into LyC Diagnostics. Astrophysical Journal, 930 (2). Art. No. 126. ISSN 0004-637X. doi:10.3847/1538-4357/ac61e4.

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The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z ≳ 6) owing to intergalactic H i absorption. To identify LyC emitters (LCEs) and infer the fraction of escaping LyC, astronomers have developed various indirect diagnostics of LyC escape. Using measurements of the LyC from the Low-redshift Lyman Continuum Survey (LzLCS), we present the first statistical test of these diagnostics. While optical depth indicators based on Lyα, such as peak velocity separation and equivalent width, perform well, we also find that other diagnostics, such as the [O iii]/[O ii] flux ratio and star formation rate surface density, predict whether a galaxy is an LCE. The relationship between these galaxy properties and the fraction of escaping LyC flux suggests that LyC escape depends strongly on H i column density, ionization parameter, and stellar feedback. We find that LCEs occupy a range of stellar masses, metallicities, star formation histories, and ionization parameters, which may indicate episodic and/or different physical causes of LyC escape.

Item Type:Article
Related URLs:
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, Stephan R.0000-0003-0503-4667
Xu, Xinfeng0000-0002-9217-7051
Wang, Bingjie0000-0001-9269-5046
Oey, M. S.0000-0002-5808-1320
Ford, N. M.0000-0001-8921-3624
Heckman, Timothy0000-0001-6670-6370
Ji, Zhiyuan0000-0001-7673-2257
Giavalisco, Mauro0000-0002-7831-8751
Amorín, 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
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
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
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 2022 March 16; accepted 2022 March 26; published 2022 May 11. 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), matplotlib (Hunter 2007), numpy (van der Walt et al. 2011), scipy (Virtanen et al. 2020).
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; Hubble Space Telescope; Ultraviolet astronomy; Emission line galaxies
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Reionization (1383); Galactic and extragalactic astronomy (563); Hubble Space Telescope (761); Ultraviolet astronomy (1736); Emission line galaxies (459)
Record Number:CaltechAUTHORS:20220512-561410000
Persistent URL:
Official Citation:Sophia R. Flury et al 2022 ApJ 930 126
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114707
Deposited By: George Porter
Deposited On:13 May 2022 17:38
Last Modified:13 May 2022 17:38

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