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

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

Jun 15, 2023 94 likes •531 views

Ly as indirect probe of LyC escape from galaxies Anne Verhamme Observatoire de Genve & CRAL Lyon SIMS: Thibault Garel, Jrmy Blaizot, Lo Michel-Dansac, Joki Rosdahl, Alaina Henry, Claudia Scarlata LCEs: Ivana Orlitova, Daniel

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Lyα 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

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Recovering systemic redshift from Lyα

On ArXiv next week :

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 2/38

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Recovering systemic redshif from the Lya emission

Zheng & Wallace 2014 Verhamme et al 2015 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 3/38

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A sample of LAEs with known systemic redshift

13 CIII]+Lyα emitters from the MUSE GTO programs :

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 4/38

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A sample of LAEs with known systemic redshift

13 CIII]+Lyα 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 Lyα + CIII] Stark+17, Vanzella+16

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 4/38

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CIII]+Lyα emitters from the MUSE GTO programs

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 5/38

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Recovering systemic redshift from Lyα : data

Method 1 : double peaks

V red

peak = 1.05(±0.11) × ∆V1/2 − 12(±37)km.s−1

Method 2 : single peaks

V red

peak = 0.90(±0.14) × FWHM(Lyα) − 34(±60)km.s−1

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 6/38

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Recovering systemic redshift from Lyα

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 7/38

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Lyα as indirect probe of LyC escape from galaxies

Theoretical Expectations spectral shape escape fraction spatial extent

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 8/38

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Lyα 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 Lyα-LyC connexion 8/38

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J1154 + 2443 : Green Pea with fesc(LyC) ∼ 46%

Izotov+18 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 9/38

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Green Peas : local analogues of the sources of reionisation?

ξion, Schaerer+16, Izotov+17 SFR density, Verhamme+17

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 10/38

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Lyα spectra

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Lyα spectra of LyC Emitters : two possible geometries

Zackrisson+13 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 12/38

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Lyα spectra of LyC Emitters – Triple peaks from holes

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 13/38

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Lyα spectra of LyC Emitters – Triple peaks from holes

Behrens, Dijkstra, Niemeyer 2014 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 14/38

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Lyα spectra of LyC Emitters – Triple peaks from holes

Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 15/38

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Lyα spectra of LyC Emitters – Triple peaks from holes

Laursen+13 Dijkstra & Grönke 2016 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 16/38

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Lyα spectra of LyC Emitters – small ∆V from optically thin H II regions

Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 17/38

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Lyα spectra of LyC Emitters – small ∆V from optically thin H II regions

Verhamme+15 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 18/38

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Lyα spectra of LyC Emitters : observations

Rivera-Thorsen+17 Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 19/38

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Lyα spectra of LyC Emitters : observations

Rivera-Thorsen+17

fesc(LyC) = 46%!, Izotov+18

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 20/38

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Lyα spectra of LyC Emitters : observations

Verhamme+17, Izotov+18

Lessons from local LyC Emitters * [OIII]/[OII] ratios increase with increasing fesc(LyC) * Lyα peaks separation decreases with increasing fesc(LyC)

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 21/38

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Lyα spectra of LyC Emitters : more observations...

ION 2, de Barros+16 ION 3, Vanzella+18

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 22/38

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Lyα escape fractions

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Lyα vs LyC escape fractions : predictions

Yajima+14 Dijkstra&Grönke, 2016 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 24/38

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Lyα vs LyC escape fractions : predictions

Yajima+14 Dijkstra&Grönke, 2016

Lyα escape fraction > LyC escape fraction

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 24/38

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Lyα vs LyC escape fractions : observations

Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 25/38

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Lyα vs LyC escape fractions : observations

Verhamme+17 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 25/38

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Lyα spatial distribution

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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 Lyα-LyC connexion 27/38

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LCEs have no/faint halos

log(NHI) = 21.1 (LBG) log(NHI) = 19.2 (LAE) log(NHI) = 17.2 (LCE)

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 28/38

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Lya halos of LyC Emitters : insights from

  • bservations?

Puschnig+18, fesc(LyC) ∼ 1 − 4% Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 29/38

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Lya halos of LyC Emitters : insights from

  • bservations?

Marchi+17, see also Yang+16 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 30/38

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PRELIMINARY : Lyα properties of a virtual LyC emitter

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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 Lyα-LyC connexion 32/38

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Lyα emission from a virtual z ∼ 6 LyC Emitter

Trebitsch+17 Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 33/38

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Lyα emission from a virtual z ∼ 6 LyC Emitter

Trebitsch+17

LyC Lyα

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 34/38

1500 1000 500 500 1000 1500 v [km/s] 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1e43

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Lyα emission from a virtual z ∼ 6 LyC Emitter

Verhamme+18 in prep

100 100 200 300 400 500 600 700 800 peaks_Sep (Km.s-1) 50 50 100 150 200 250 300 Vpeak (Km.s-1)

Verhamme 2017

7.2 6.4 5.6 4.8 4.0 3.2 2.4 1.6 0.8 Log(fLyC) 0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 fLyA 50 50 100 150 200 250 300 Vpeak (Km.s-1)

Verhamme 2017

7.2 6.4 5.6 4.8 4.0 3.2 2.4 1.6 0.8 Log(fLyC)

Tokyo, Sakura CLAW Anne Verhamme Lyα-LyC connexion 35/38

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Conclusions

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

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Back-up slides

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