We present the HST WFC3/F275W UV imaging observations of A2218-Flanking , a lensed compact dwarf galaxy at redshift z \approx 2.5 .
The stellar mass of A2218-Flanking is \log ( M _ { * } / M _ { \sun } ) = 9.14 \substack { +0.07 \ -0.04 } and SFR is 12.5 \substack { +3.8 \ -7.4 } M _ { \sun } yr ^ { -1 } after correcting the magnification .
This galaxy has a young galaxy age of 127 Myr and a compact galaxy size of r _ { 1 / 2 } = 2.4 kpc .
The HST UV imaging observations cover the rest-frame Lyman continuum ( LyC ) emission ( \sim 800 Å ) from A2218-Flanking .
We firmly detect ( 14 \sigma ) the LyC emission in A2218-Flanking in the F275W image .
Together with the HST F606W images , we find that the absolute escape fraction of LyC is f _ { abs,esc } > 28 - 57 \% based on the flux density ratio between 1700Å and 800Å ( f _ { 1700 } / f _ { 800 } ) .
The morphology of the LyC emission in the F275W images is extended and well follows the morphology of the UV continuum morphology in the F606W images , suggesting that the f _ { 800 } is not from foreground contaminants .
We find that the region with a high star formation rate surface density has a lower f _ { 1700 } / f _ { 800 } ( higher f _ { 800 } / f _ { 1700 } ) ratio than the diffused regions , suggesting that LyC photons are more likely to escape from the region with the intensive star-forming process .
We compare the properties of galaxies with and without LyC detections and find that LyC photons are easier to escape in low mass galaxies .