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The main goal of this study is to carry out a spatially resolvedinvestigation of the warm interstellar medium (ISM) in the extremely metal-poorBlue Compact Dwarf (BCD) galaxy HS 2236+1344. Special emphasis is laid on theanalysis of the spatial distribution of chemical abundances, emission-lineratios and kinematics of the ISM, and to the recent star-forming activity inthis galaxy. This study is based on optical integral field unit spectroscopydata from Gemini Multi-Object Spectrograph at the Gemini North telescope andarchival Sloan Digital Sky Survey images. The data were obtained in twodifferent positions across the galaxy, obtaining a total 4 arcsec X 8 arcsecfield which encompasses most of its ISM. Emission-line maps and broad-bandimages obtained in this study indicate that HS 2236+1344 hosts three Giant HIIregions. Our data also reveal some faint curved features in the BCD peripherythat might be due to tidal perturbations or expanding ionized-gas shells. TheISM velocity field shows systematic gradients along the major axis of the BCD,with its south-eastern and north-western half differing by ~80 km/s in theirrecessional velocity. The Ha and Hb equivalent width distribution in thecentral part of HS 2236+1344 is consistent with a very young (~3 Myr) burst.Our surface photometry analysis indicates that the ongoing starburst provides~50% of the total optical emission, similar to other BCDs. It also reveals anunderlying lower-surface brightness component with moderately red colors, whichsuggest that the galaxy has undergone previous star formation. We derive anintegrated oxygen abundance of 12+log(O/H)=7.53\pm0.06 and a nitrogen-to-oxygenratio of log(N/O)=-1.57\pm0.19. Our results are consistent, within theuncertainties, with a homogeneous distribution of oxygen and nitrogen withinthe ISM of the galaxy. (abridged)

astronomy and astrophysics

On the properties of the interstellar medium in extremely metal-poor  blue compact dwarf galaxies: GMOS-IFU spectroscopy and SDSS photometry of the  double-knot galaxy HS 2236+1344