Low-redshift Lyman continuum leaking galaxies with high [O iii]/[O ii] ratios
By Y. Izotov, G. Worseck, Daniel Schaerer, N. Guseva, T. Thuan, K. Fricke, A. Verhamme, I. A. Observatory, Kyiv, Ukraine and 15 more. 2018
206 citations recorded by the source corpus.
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of five star-forming galaxies at redshifts z in the range 0.2993-0.4317 and with high emission-line flux ratios O32=[OIII]5007/[OII]3727 ~ 8-27 aiming to detect the Lyman continuum (LyC) emission. We detect LyC emission in all galaxies with the escape fractions fesc(LyC) in a range of 2-72 per cent. A narrow Ly-alpha emission line with two peaks in four galaxies and with three peaks in one object is seen in medium-resolution COS spectra with a velocity separation between the peaks Vsep varying from ~153 km/s to ~345 km/s. We find a general increase of the LyC escape fraction with increasing O32 and decreasing stellar mass M*, but with a large scatter of fesc(LyC). A tight anti-correlation is found between fesc(LyC) and Vsep making Vsep a good parameter for the indirect determination of the LyC escape fraction. We argue that one possible source driving the escape of ionizing radiation is stellar winds and radiation from hot massive stars.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/896b722d479725124c1211871ff4423b317df88e
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In Astronomy and Astrophysics
Citations in the corpus
- Rapid Reionization by the Oligarchs: The Case for Massive, UV-bright, Star-forming Galaxies with High Escape Fractions (2019, background): “The campaigns targeting Green Peas at z∼0.3 with Hubble Space Telescope (HST)/COS have proven remarkably efficient (boasting a 100% success rate for LyC detection; Izotov et al. 2016b, 2018b).”
- RELICS: Reionization Lensing Cluster Survey (2019, background): “…been obtained recently for ∼40 galaxies with detected LyC leakage, including half extending from the local universe (e.g., Leitherer et al. 2016) to z ∼ 0.3 (e.g., Izotov et al. 2018), with the other half at z ∼ 2 − 4 (e.g., Shapley et al. 2016; Rivera-Thorsen et al. 2017; Vanzella et al. 2018).”
- Evolution of the AGN UV luminosity function from redshift 7.5 (2018, background): “Alternatively, it may be possible to balance the ionization rate deficit by the contribution from low-redshift LyC-leaking galaxies (Izotov et al. 2016, 2018a,b)”
- JWST Census for the Mass–Metallicity Star Formation Relations at z = 4–10 with Self-consistent Flux Calibration and Proper Metallicity Calibrators (2023, background): “Its implication regarding the escape of ionizing photons ( and that of Ly α photons ) are also discussed ( e.g., Nakajima & Ouchi 2014; Izotov et al. 2016, 2018; Verhamme et al. 2017; Steidel et al. 2018; Fletcher et al. 2019; Erb et al. 2019; Nakajima et al. 2020; Katz et al. 2020; Flury et al.…”