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 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
Hα, [OIII], and/or [OII] emission lines in the PEARS sample of
906 galaxies to a limiting flux of ∼10-18erg/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*≥109M☉ 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 (∼11.65arcmin2 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 101 1162 Properties of 883 PEARS emission-line galaxies
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
J/AJ/141/64 : PEARS emission-line galaxies spectroscopy (Xia+, 2011)
J/AJ/141/14 : HST WFC3 ERS : emission-line galaxies (Straughn+, 2011)
J/ApJ/742/111 : Extreme emission-line gal. in CANDELS (van der Wel+, 2011)
J/ApJ/706/158 : Early-type galaxies in PEARS (Ferreras+, 2009)
J/ApJ/695/1591 : Spectrophotometry in PEARS fields (Pirzkal+, 2009)
J/AJ/138/1022 : Emission-line galaxies from HST PEARS survey (Straughn+, 2009)
J/AJ/135/1624 : PEARS emission-line galaxies (Straughn+, 2008)
J/ApJS/172/456 : [OII] emitting gal. in COSMOS + SDF fields (Takahashi+, 2007)
J/ApJ/659/162 : CAS parameters of 199 nearby galaxies (Taylor-Mager+, 2007)
J/ApJ/657/738 : SDF galaxies multi-photometry (Ly+, 2007)
J/ApJ/633/871 : Positions and photometry of HII knots in M51 (Calzetti+, 2005)
J/AJ/130/1324 : Faint emission-line galaxies at z≤1.6 (Drozdovsky+, 2005)
J/AJ/128/163 : Galaxy morphological classification (Lotz+, 2004)
J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [PEARS-]
7- 12 A6 --- Field PEARS Field
14- 20 A7 --- ID PEARS identifier (sNNNNNN or nNNNNNN)
22- 23 I2 --- ELR [1/23] PEARS emission-line region (ELR)
identifier
25- 36 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000)
38- 49 F12.8 deg DEdeg Declination in decimal degrees (J2000)
51- 55 F5.2 --- z [0.05/6]?=99 Grism redshift
57- 62 F6.1 zW/m2 Flux [2.8/5965] Observed flux (10-18erg/s/cm2)
64- 70 F7.1 zW/m2 e_Flux [0/10070] Uncertainty in Flux
72- 75 I4 0.1nm lambda [5518/9969] Wavelength λ(Å)
77- 82 I6 0.1nm EW [1/357106] Equivalength width (Å)
84- 87 F4.1 mag imag [16.3/28.3] HST i band AB magnitude
89- 97 A9 --- LineID Line identifier
99-101 F3.1 --- Grade [2/4.2] Line grade (highest=5) (1)
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Note (1): Emission lines graded on a scale ranging from 0 (very poor)
to 5 (very high).
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History:
From electronic version of the journal
References:
Straughn et al. Paper I. 2009AJ....138.1022S 2009AJ....138.1022S Cat. J/AJ/138/1022
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Feb-2015