J/AJ/135/1624       PEARS emission-line galaxies               (Straughn+, 2008)
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Beginning of ReadMe : J/AJ/135/1624 PEARS emission-line galaxies (Straughn+, 2008) ================================================================================ Emission-line galaxies from the PEARS Hubble ultra deep field: a 2D detection method and first results. Straughn A.N., Meurer G.R., Pirzkal N., Cohen S.H., Malhotra S., Rhoads J., Windhorst R.A., Gardner J.P., Hathi N.P., Xu C., Gronwall C., Koekemoer A.M., Walsh J., Alighieri S.D.S. <Astron. J., 135, 1624-1635 (2008)> =2008AJ....135.1624S ================================================================================ ADC_Keywords: Galaxies, spectra ; Photometry, SDSS ; Redshifts Keywords: galaxies: starburst - methods: data analysis - techniques: spectroscopic Abstract: The Hubble Space Telescope Advanced Camera for Surveys grism Probing Evolution And Reionization Spectroscopically (PEARS) survey provides a large dataset of low-resolution spectra from thousands of galaxies in the GOODS north and south fields. One important subset of objects in these data is emission-line galaxies (ELGs), and we have investigated several different methods aimed at systematically selecting these galaxies. Here, we present a new methodology and results of a search for these ELGs in the PEARS observations of the Hubble Ultra Deep Field (HUDF) using a 2D detection method that utilizes the observation that many emission lines originate from clumpy knots within galaxies. This 2D line-finding method proves to be useful in detecting emission lines from compact knots within galaxies that might not otherwise be detected using more traditional 1D line-finding techniques. Description: The PEARS ACS grism survey data consist of eight ACS fields with three HST roll angles each (with limiting AB magnitude i'_AB_< 26.5mag; 20 HST orbits per field) plus the HUDF field with four roll angles (limiting AB magnitude i'AB <27.5mag; 40 HST orbits total) taken with the ACS WFC G800L grism. The G800L grism yields low-resolution (R 100) optical spectroscopy between 6000-9500AA. Four PEARS fields were observed in the GOODS-N and five fields (including the HUDF) in the GOODS-S. A forthcoming data paper (S. Malhotra et al. 2008, in preparation) will describe the PEARS project and data in detail.

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