Lyman alpha and Lyman continuum emission of Mg Ⅱ-selected star-forming galaxies

Izotov, Y. I.; Chisholm, J.; Worseck, G.; Guseva, N. G.; Schaerer, D.; Prochaska, J. X.

doi:10.1093/mnras/stac1899

Title: Lyman alpha and Lyman continuum emission of Mg Ⅱ-selected star-forming galaxies

Journal Article · 21 July 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac1899 · OSTI ID:1982631

^[1];

^[2];

^[3]; Guseva, N. G. ^[1]; Schaerer, D. ^[4]; Prochaska, J. X. ^[5]

National Academy of Sciences of Ukraine, Kyiv (Ukraine)
University of Texas, Austin, TX (United States)
University of Potsdam (Germany)
University of Geneva (Switzerland); Centre National de la Recherche Scientifique (CNRS), Toulouse(France)
University of California, Santa Cruz, CA (United States)

We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of seven compact low-mass star-forming galaxies at redshifts, z, in the range 0.3161–0.4276, with various O₃Mg₂ = [O iii] λ5007/Mg ii λ2796+2803 and Mg₂ = Mg ii λ2796/Mg ii λ2803 emission-line ratios. We aim to study the dependence of leaking Lyman continuum (LyC) emission on the characteristics of Mg ii emission together with the dependencies on other indirect indicators of escaping ionizing radiation. LyC emission with escape fractions f_esc(LyC) = 3.1–4.6 percent is detected in four galaxies, whereas only 1σ upper limits of f_esc(LyC) in the remaining three galaxies were derived. A strong narrow Lyα emission line with two peaks separated by V_sep ~ 298–592 km s^-1 was observed in four galaxies with detected LyC emission and very weak Lyα emission is observed in galaxies with LyC non-detections. Our new data confirm the tight anticorrelation between f_esc(LyC) and V_sep found for previous low-redshift galaxy samples. V_sep remains the best indirect indicator of LyC leakage among all considered indicators. It is found that escaping LyC emission is detected predominantly in galaxies with Mg₂ ≳ 1.3. A tendency of an increase of f_esc(LyC) with increasing of both the O₃Mg₂ and Mg₂ is possibly present. However, there is substantial scatter in these relations not allowing their use for reliable prediction of f_esc(LyC).

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS); University of California, Santa Cruz, CA (United States); University of Texas, Austin, TX (United States)

Sponsoring Organization:: Alfred P. Sloan Foundation; National Academy of Sciences of Ukraine; National Aeronautics and Space Agency (NASA); USDOE Office of Science (SC)

OSTI ID:: 1982631

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 515; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters Flury, Sophia R.; Jaskot, Anne E.; Ferguson, Harry C. The Astrophysical Journal Supplement Series, Vol. 260, Issue 1 https://doi.org/10.3847/1538-4365/ac5331	journal	April 2022
Q1549-C25: A CLEAN SOURCE OF LYMAN-CONTINUUM EMISSION AT z = 3.15 Shapley, Alice E.; Steidel, Charles C.; Strom, Allison L. The Astrophysical Journal, Vol. 826, Issue 2 https://doi.org/10.3847/2041-8205/826/2/L24	journal	July 2016

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