J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent 
leakage of Lyman continuum photons

Izotov, Y. I.; Schaerer, D.; Worseck, G.; Guseva, N. G.; Thuan, T. X.; Verhamme, A.; Orlitová, I.; Fricke, K. J.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons

MPS-Authors

Izotov, Y. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schaerer, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Worseck, G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guseva, N. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Thuan, T. X.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Verhamme, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Orlitová, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fricke, K. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018MNRAS.474.4514I
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Izotov, Y. I., Schaerer, D., Worseck, G., Guseva, N. G., Thuan, T. X., Verhamme, A., et al. (2018). J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons. Monthly Notices of the Royal Astronomical Society, 474, 4514-4527.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CD14-E

Abstract

We report the detection of the Lyman continuum (LyC) radiation of the compact star-forming galaxy (SFG) J1154+2443 observed with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope. This galaxy, at a redshift of z = 0.3690, is characterized by a high emission-line flux ratio O₃₂ = [O III] λ5007/[O II] λ3727 = 11.5. The escape fraction of the LyC radiation f_esc(LyC) in this galaxy is 46 per cent, the highest value found so far in low- redshift SFGs and one of the highest values found in galaxies at any redshift. The narrow double-peaked Ly α emission line is detected in the spectrum of J1154+2443 with a separation between the peaks V_sep of 199 km s^-1, one of the lowest known for Ly α-emitting galaxies, implying a high f_esc(Ly α). Comparing the extinction-corrected Ly α/H β flux ratio with the case B value, we find f_esc(Ly α) = 98 per cent. Our observations, combined with previous detections in the literature, reveal an increase of O₃₂ with increasing f_esc(LyC). We also find a tight anticorrelation between f_esc(LyC) and V_sep. The surface brightness profile derived from the COS acquisition image reveals a bright star-forming region in the centre and an exponential disc in the outskirts with a disc scale length α = 1.09 kpc. J1154+2443, compared to other known low-redshift LyC leakers, is characterized by the lowest metallicity, 12+log O/H = 7.65 ± 0.01, the lowest stellar mass M_⋆ = 10^8.20 M_☉, a similar star formation rate SFR = 18.9 M_☉ yr^-1, and a high specific SFR of 1.2 × 10^-7 yr^-1.