Abstract

ALMA has revolutionized the study of reionization-era galaxies. With the launch of JWST last year, it is crucial to establish a local reference sample of high-redshift “analog” galaxies covering essential UV, optical and FIR emission lines that will soon become available in the upcoming JWST & ALMA era. A local (z=0.0040705), metal-poor (12 + log(O/H) = 7.76) blue compact dwarf galaxy, Pox 186, exhibits the brightest CIII ] 1908 emission (equivalent width 36 A) observed at any redshifts as revealed by the HST /COS observations, along with an extreme [OIII] 88/[CII] 158 (ca 10). This extreme CIII ] is comparable to those observed in galaxies at redshifts of z=6-7, when the reionization process is thought to be completed. I will present the analysis of UV nebular and stellar lines as revealed in this galaxy by the HST /COS observations. The work is very timely as reionization era galaxies galaxies are now being routinely detected with the JWST .