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PEARS Emission Line GalaxiesWe present a full analysis of the Probing Evolution And Reionization Spectroscopically (PEARS) slitless grism spectroscopic data obtained vl'ith the Advanced Camera for Surveys on HST. 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 to support the spectroscopic results. Using the PEARS data we are able to identify star forming galaxies within the redshift volume 0 < z < 1.5. Star forming regions in the PEARS survey are pinpointed independently of the host galaxy. This method allOW8 us to detect the presence of multiple emission line regions (ELRs) within a single galaxy. 1162 [OII], [OIII] and/or H-alpha emission lines have been identified in the PEARS sample of approx 906 galaxies down to a limiting flux of approx 10 - 18 erg/s/sq cm . 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 disturbed morphologies, with star formation occurring predominantly within one effective (half-light) radius. However, the morphologies show no correlation with host stellar mass; and 3) The number density of star forming galaxies with M(*) >= 10(exp 9) Solar M decreases by an order of magnitude at z<=0.5 relative to the number at 0.5 < z < 0.9 in support of the argument for galaxy downsizing.
Document ID
20120015659
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Pirzkal, Nor (Space Telescope Science Inst. Baltimore, MD, United States)
Rothberg, Barry (Space Telescope Science Inst. Baltimore, MD, United States)
Ly, Chun (Space Telescope Science Inst. Baltimore, MD, United States)
Rhoads, James E. (Arizona State Univ. Tempe, AZ, United States)
Malhotra, Sangeeta (Arizona State Univ. Tempe, AZ, United States)
Grogin, Norman A. (Space Telescope Science Inst. Baltimore, MD, United States)
Dahlen, Tomas (Space Telescope Science Inst. Baltimore, MD, United States)
Meurer, Gerhardt R. (Western Australia Univ. Crawley, Australia)
Walsh, Jeremy (European Southern Observatory Garching, Germany)
Hathi, Nimish P. (Carnegie Institution for Science Pasadena, CA, United States)
Cohen, Seth (Arizona State Univ. Tempe, AZ, United States)
Belini, Andrea (Space Telescope Science Inst. Baltimore, MD, United States)
Holwerda, Benne W. (European Space Research and Technology Centre Noordwijk, Netherlands)
Straughn, Amber (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mechtley, Matthew (Arizona State Univ. Tempe, AZ, United States)
Date Acquired
August 26, 2013
Publication Date
January 1, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.7091.2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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