2009MNRAS.394..693M

We present results from integral field spectroscopy with the Potsdam Multi-Aperture Spectrograph of the head of the Herbig-Haro (HH) object HH202 with a spatial sampling of 1x1arcsec². We have obtained maps of different emission lines, physical conditions - such as electron temperature and density - and ionic abundances from recombination and collisionally excited lines. We present the first map of the Balmer temperature and of the temperature fluctuation parameter, t². We have calculated the t² in the plane of the sky, which is substantially smaller than that determined along the line of sight. We have mapped the abundance discrepancy factor (ADF) of O²⁺, ADF(O²⁺), finding its maximum value at the HH202-S position. We have explored the relations between the ADF(O²⁺) and the electron density, the Balmer and [Oiii] temperatures, the ionization degree as well as the t² parameter. We do not find clear correlations between these properties and the results seem to support that the ADF and t² are independent phenomena. We have found a weak negative correlation between the O²⁺ abundance determined from recombination lines and the temperature, which is the expected behaviour in an ionized nebula, hence it seems that there is no evidence for the presence of supermetal-rich droplets in Hii regions.