Ly as indirect probe of LyC escape from galaxies Anne Verhamme - PowerPoint PPT Presentation

Ly α as indirect probe of LyC escape from galaxies Anne Verhamme Observatoire de Genève & CRAL Lyon SIMS: Thibault Garel, Jérémy Blaizot, Léo Michel-Dansac, Joki Rosdahl, Alaina Henry, Claudia Scarlata LCEs: Ivana Orlitova, Daniel Schaerer, John Chisholm, Matthew Hayes, Yuri Izotov, Gabor Worseck, Natalia Guseva, Trin Thuan MUSE: Josie Kerutt, Hanae Inami, Johan Richard, Mieke Paalvast, Peter Weilbacher and the GTO consortium

Recovering systemic redshift from Ly α On ArXiv next week : Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 2/38

Recovering systemic redshif from the Lya emission Zheng & Wallace 2014 Verhamme et al 2015 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 3/38

A sample of LAEs with known systemic redshift 13 CIII]+Ly α emitters from the MUSE GTO programs : Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 4/38

A sample of LAEs with known systemic redshift 13 CIII]+Ly α emitters from the MUSE GTO programs : plus LAEs from the litterature with known systemic redshift : * 43 Green Peas at z ∼ 0 . 3 Yang+17 * 6 LAEs and 20 LBGs at z ∼ 2 − 3 Hashimoto+15, Kulas+12 * few rare objects at high redshit with Ly α + CIII] Stark+17, Vanzella+16 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 4/38

CIII]+Ly α emitters from the MUSE GTO programs Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 5/38

Recovering systemic redshift from Ly α : data Method 2 : single peaks Method 1 : double peaks V red peak = 1 . 05 ( ± 0 . 11 ) × ∆ V 1 / 2 − 12 ( ± 37 ) km . s − 1 V red peak = 0 . 90 ( ± 0 . 14 ) × FWHM ( Ly α ) − 34 ( ± 60 ) km . s − 1 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 6/38

Recovering systemic redshift from Ly α Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 7/38

Ly α as indirect probe of LyC escape from galaxies Theoretical Expectations spectral shape escape fraction spatial extent Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 8/38

Ly α as indirect probe of LyC escape from galaxies Theoretical Expectations spectral shape escape fraction spatial extent Observations, today 14 LyC emitters at z < 0.4 Bergvall+06, Leitet+13, Borthakur+14, Leitherer+16, Izotov+16a,b,18 4 LyC emitters at 2 < z < 4 Vanzella+16, Shapley+16, Bian+17, Vanzella+18 upper limits on the escape fraction from galaxy populations Rutkowski+16,17, Grazian+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 8/38

J 1154 + 2443 : Green Pea with fesc(LyC) ∼ 46% Izotov+18 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 9/38

Green Peas : local analogues of the sources of reionisation? ξ ion , Schaerer+16, Izotov+17 SFR density, Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 10/38

Ly α spectra

Ly α spectra of LyC Emitters : two possible geometries Zackrisson+13 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 12/38

Ly α spectra of LyC Emitters – Triple peaks from holes Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 13/38

Ly α spectra of LyC Emitters – Triple peaks from holes Behrens, Dijkstra, Niemeyer 2014 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 14/38

Ly α spectra of LyC Emitters – Triple peaks from holes Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 15/38

Ly α spectra of LyC Emitters – Triple peaks from holes Laursen+13 Dijkstra & Grönke 2016 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 16/38

Ly α spectra of LyC Emitters – small ∆ V from optically thin H II regions Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 17/38

Ly α spectra of LyC Emitters – small ∆ V from optically thin H II regions Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 18/38

Ly α spectra of LyC Emitters : observations Rivera-Thorsen+17 Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 19/38

Ly α spectra of LyC Emitters : observations Rivera-Thorsen+17 fesc(LyC) = 46%!, Izotov+18 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 20/38

Ly α spectra of LyC Emitters : observations Verhamme+17, Izotov+18 Lessons from local LyC Emitters * [OIII]/[OII] ratios increase with increasing fesc(LyC) * Ly α peaks separation decreases with increasing fesc(LyC) Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 21/38

Ly α spectra of LyC Emitters : more observations... ION 3, Vanzella+18 ION 2, de Barros+16 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 22/38

Ly α escape fractions

Ly α vs LyC escape fractions : predictions Yajima+14 Dijkstra&Grönke, 2016 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 24/38

Ly α vs LyC escape fractions : predictions Yajima+14 Dijkstra&Grönke, 2016 Ly α escape fraction > LyC escape fraction Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 24/38

Ly α vs LyC escape fractions : observations Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 25/38

Ly α vs LyC escape fractions : observations Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 25/38

Ly α spatial distribution

Lya spatial vs spectral escape from expanding shells Verhamme, Garel et al, in prep log(NHI) = 20.2, Vexp = 150 km/s Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 27/38

LCEs have no/faint halos log(NHI) = 21.1 log(NHI) = 19.2 log(NHI) = 17.2 (LBG) (LAE) (LCE) Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 28/38

Lya halos of LyC Emitters : insights from observations? Puschnig+18 , fesc(LyC) ∼ 1 − 4% Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 29/38

Lya halos of LyC Emitters : insights from observations? Marchi+17, see also Yang+16 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 30/38

PRELIMINARY : Ly α properties of a virtual LyC emitter

New RT code : RASCAS (aka MCLya v.2.0) A massively parallel code for line transfer in AMR simulations Michel-Dansac+17 in prep /w Verhamme * memory footprint * load balancing * modularity Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 32/38

Ly α emission from a virtual z ∼ 6 LyC Emitter Trebitsch+17 Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 33/38

Ly α emission from a virtual z ∼ 6 LyC Emitter LyC Trebitsch+17 Ly α 1.2 1e43 1.0 0.8 0.6 0.4 0.2 0.0 1500 1000 500 0 500 1000 1500 v [km/s] Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 34/38

Ly α emission from a virtual z ∼ 6 LyC Emitter Verhamme+18 in prep 300 300 Verhamme 2017 Verhamme 2017 0.8 0.8 250 250 1.6 1.6 200 2.4 200 2.4 Vpeak (Km.s-1) 3.2 Vpeak (Km.s-1) 3.2 150 Log(fLyC) 150 Log(fLyC) 4.0 4.0 100 100 4.8 4.8 50 5.6 50 5.6 6.4 6.4 0 0 7.2 7.2 50 50 100 0 100 200 300 400 500 600 700 800 0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 peaks_Sep (Km.s-1) fLyA Tokyo, Sakura CLAW Anne Verhamme Ly α -LyC connexion 35/38

Conclusions Ly α can trace LyC escape from galaxies : LyC leakers have strong narrow Ly α lines with small peaks separations, high Ly α escape fractions, and are compact in Ly α .

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