English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

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;

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 fesc(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 Vsep of 199 km s-1, one of the lowest known for Ly α-emitting galaxies, implying a high fesc(Ly α). Comparing the extinction-corrected Ly α/H β flux ratio with the case B value, we find fesc(Ly α) = 98 per cent. Our observations, combined with previous detections in the literature, reveal an increase of O32 with increasing fesc(LyC). We also find a tight anticorrelation between fesc(LyC) and Vsep. 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 = 108.20 M, a similar star formation rate SFR = 18.9 M yr-1, and a high specific SFR of 1.2 × 10-7 yr-1.