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We present infrared (IR) spectral energy distributions (SEDs) of individualstar-forming regions in four extremely metal poor (EMP) galaxies withmetallicity Z around Zsun/10 as observed by the Herschel Space Observatory.With the good wavelength coverage of the SED, it is found that these EMPstar-forming regions show distinct SED shapes as compared to those of granddesign Spirals and higher metallicity dwarfs: they have on average much higherf70um/f160um ratios at a given f160um/f250um ratio; single modified black-body(MBB) fittings to the SED at \lambda >= 100 um still reveal higher dusttemperatures and lower emissivity indices compared to that of Spirals, whiletwo MBB fittings to the full SED with a fixed emissivity index (beta = 2) showthat even at 100 um about half of the emission comes from warm (50 K) dust, incontrast to the cold (~20 K) dust component. Our spatially resolved imagesfurther reveal that the far-IR colors including f70um/f160um, f160um/f250um andf250um/f350um are all related to the surface densities of young stars as tracedby far-UV, 24 um and SFRs, but not to the stellar mass surface densities. Thissuggests that the dust emitting at wavelengths from 70 um to 350 um isprimarily heated by radiation from young stars.

Spatially resolved dust emission of extremely metal poor galaxies