Low- and intermediate mass galaxies are widely discussed as cause of reionization at redshift z \sim 10 - 6 .
However , observational proof of galaxies that are leaking ionizing radiation ( Lyman continuum ; LyC ) is a currently ongoing challenge and the list of LyC emitting candidates is still short .
Tololo 1247-232 is among those very few galaxies with recently reported leakage .
We performed intermediate resolution ultraviolet ( UV ) spectroscopy with the Cosmic Origins Spectrograph ( COS ) onboard the Hubble Space Telescope and confirm ionizing radiation emerging from Tololo 1247-232 .
Adopting an improved data reduction procedure , we find that LyC escapes from the central stellar clusters , with an escape fraction of 1.5 \pm 0.5 % only , i.e .
the lowest value reported for the galaxy so far .
We further make use of FUV absorption lines of Si II and Si IV as a probe of the neutral and ionized interstellar medium .
We find that most of the ISM gas is ionized , likely facilitating LyC escape from density bounded regions .
Neutral gas covering as a function of line-of-sight velocity is derived using the apparent optical depth method .
The ISM is found to be sufficiently clumpy , supporting the direct escape of LyC photons .
We further report on broadband UV and optical continuum imaging as well as narrowband imaging of Ly \upalpha , H \upalpha and H \upbeta .
Using stellar population synthesis , a Ly \upalpha escape fraction of 8 % was derived .
We also performed VLA 21cm imaging .
The hydrogen hyperfine transition was not detected , but a deep upper limit atomic gas mass of \lesssim 10 ^ { 9 } M _ { \odot } could be derived .
The upper limit gas fraction defined as \nicefrac { { M _ { HI } } } { { M _ { * } } } is only 20 % .
Evidence is found that the H I gas halo is relatively small compared to other Lyman Alpha emitters .