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We present a full analysis of the Probing Evolution And ReionizationSpectroscopically (PEARS) slitess grism spectroscopic data obtained with theAdvanced Camera for Surveys on HST. PEARS covers fields within both the GreatObservatories Origins Deep Survey (GOODS) North and South fields, making itideal as a random survey of galaxies, as well as the availability of a widevariety of ancillary observations to support the spectroscopic results. Usingthe PEARS data we are able to identify star forming galaxies within theredshift volume 0< z<1.5. Star forming regions in the PEARS survey arepinpointed independently of the host galaxy. This method allows us to detectthe presence of multiple emission line regions (ELRs) within a single galaxy.1162 Ha, [OIII] and/or [OII] emission lines have been identified in the PEARSsample of ~906 galaxies down to a limiting flux of ~1e-18 erg/s/cm^2. The ELRshave also been compared to the properties of the host galaxy, includingmorphology, luminosity, and mass. From this analysis we find three key results:1) The computed line luminosities show evidence of a flattening in theluminosity function with increasing redshift; 2) The star forming systems showevidence of disturbed morphologies, with star formation occurring predominantlywithin one effective (half-light) radius. However, the morphologies show nocorrelation with host stellar mass; and 3) The number density of star forminggalaxies with M_* > 1e9} M_sun decreases by an order of magnitude at z<0.5relative to the number at 0.5<z<0.9 in support of the argument for galaxydownsizing.

astrophysical journal/the astrophysical journal

Emission-Line Galaxies from the Hubble Space Telescope Probing Evolution  and Reionization Spectroscopically (PEARS) Grism Survey. II: The Complete  Sample