/ftp/cats/aliases/P/PEARS_3_



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J/ApJ/772/48       Emission-line galaxies from PEARS. II.       (Pirzkal+, 2013)
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	table2.dat
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Beginning of ReadMe : J/ApJ/772/48 Emission-line galaxies from PEARS. II. (Pirzkal+, 2013) ================================================================================ Emission-line galaxies from the Hubble Space Telescope Probing Evolution And Reionization Spectroscopically (PEARS) grism survey. II. The complete sample. Pirzkal N., Rothberg B., Ly C., Malhotra S., Rhoads J.E., Grogin N.A., Dahlen T., Noeske K.G., Meurer G.R., Walsh J.R., Hathi N.P., Cohen S.H., Bellini A., Holwerda B.W., Straughn A.N., Mechtley M., Windhorst R.A. <Astrophys. J., 772, 48 (2013)> =2013ApJ...772...48P ================================================================================ ADC_Keywords: Galaxies, optical ; Equivalent widths ; Photometry, HST ; Redshifts ; Spectra, infrared Keywords: catalogs; galaxies: evolution; galaxies: luminosity function, mass function; line: identification Abstract: We present a full analysis of the Probing Evolution And Reionization Spectroscopically (PEARS) slitess grism spectroscopic data obtained with the Advanced Camera for Surveys on board Hubble Space Telescope. PEARS covers fields within both the Great Observatories Origins Deep Survey (GOODS) North and South fields, making it ideal as a random survey of galaxies, as well as the availability of a wide variety of ancillary observations complemented by the spectroscopic results. Using the PEARS data, we are able to identify star-forming galaxies (SFGs) within the redshift volume 0<z<1.5. Star-forming regions in the PEARS survey are pinpointed independently of the host galaxy. This method allows us to detect the presence of multiple emission-line regions (ELRs) within a single galaxy. We identified a total of 1162 Halpha, [OIII], and/or [OII] emission lines in the PEARS sample of 906 galaxies to a limiting flux of  10^-18^erg/s/cm2. The ELRs have also been compared to the properties of the host galaxy, including morphology, luminosity, and mass. From this analysis, we find three key results: (1) the computed line luminosities show evidence of a flattening in the luminosity function with increasing redshift; (2) the star-forming systems show evidence of complex morphologies with star formation occurring predominantly within one effective (half-light) radius. However, the morphologies show no correlation with host stellar mass. (3) Also, the number density of SFGs with M_*_>=10^9^M_sun_ decreases by an order of magnitude at z<=0.5 relative to the number at 0.5<z<0.9, supporting the argument of galaxy downsizing. Description: The PEARS observations were obtained as part of a large HST proposal (200 orbits, Proposal 10530; PI: Malhotra). The program used the ACS Wide Field Camera (WFC) in conjunction with its G800L grism filter. The G800L has a resolution of R 69-131, and provides wavelength coverage of 0.55-1.05um across the entire ACS/WFC field of view. A total of nine fields ( 11.65arcmin^2^ for each field) were observed for  40000s (20 orbits) each, split evenly between observations taken at different position angles on the sky (typically three per pointing). See Figure 1.