J/AJ/149/178 Redshift catalog of galaxies in GOODS-South field (Morris+, 2015)
A WFC3 grism emission line redshift catalog in the GOODS-South field.
Morris A.M., Kocevski D.D., Trump J.R., Weiner B.J., Hathi N.P., Barro G.,
Dahlen T., Faber S.M., Finkelstein S.L., Fontana A., Ferguson H.C.,
Grogin N.A., Grutzbauch R., Guo Y., Hsu L.-T., Koekemoer A.M., Koo D.C.,
Mobasher B., Pforr J., Salvato M., Wiklind T., Wuyts S.
<Astron. J., 149, 178 (2015)>
=2015AJ....149..178M 2015AJ....149..178M
ADC_Keywords: Galaxy catalogs ; Galaxies, IR ; Redshifts
Keywords: catalogs - galaxies: high-redshift - techniques: spectroscopic
Abstract:
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3)
imaging and G141 grism observations from the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and 3D-HST
surveys to produce a catalog of grism spectroscopic redshifts for
galaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra
cover a wavelength range of 1.1≤λ≤1.7µm with a
resolving power of R∼130 for point sources, thus providing rest-frame
optical spectra for galaxies out to z∼3.5. The catalog is selected in
the H-band (F160W) and includes both galaxies with and without
previously published spectroscopic redshifts. Grism spectra are
extracted for all H-band detected galaxies with H≤24 and a CANDELS
photometric redshift zphot≥0.6. The resulting spectra are visually
inspected to identify emission lines, and redshifts are determined
using cross-correlation with empirical spectral templates. To
establish the accuracy of our redshifts, we compare our results
against high-quality spectroscopic redshifts from the literature.
Using a sample of 411 control galaxies, this analysis yields a
precision of σNMAD=0.0028 for the grism-derived redshifts,
which is consistent with the accuracy reported by the 3D-HST team. Our
final catalog covers an area of 153arcmin2 and contains 1019
redshifts for galaxies in GOODS-S. Roughly 60% (608/1019) of these
redshifts are for galaxies with no previously published spectroscopic
redshift. These new redshifts span a range of 0.677≤z≤3.456 and
have a median redshift of z=1.282. The catalog contains a total of 234
new redshifts for galaxies at z>1.5. In addition, we present 20 galaxy
pair candidates identified for the first time using the grism
redshifts in our catalog, including four new galaxy pairs at z∼2,
nearly doubling the number of such pairs previously identified.
Description:
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3)
imaging and G141 grism observations from the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and 3D-HST
surveys to produce a catalog of grism spectroscopic redshifts for
galaxies in the CANDELS/GOODS-South field.
Our parent sample is drawn from the H-band selected photometric
catalog of Guo et al. 2013 (cat. J/ApJS/207/24), which made use of the
HST/WFC3 imaging of the GOODS-South field from three programs: the
Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
(CANDELS; Grogin et al., 2011ApJS..197...35G 2011ApJS..197...35G; Koekemoer et al.,
2011ApJS..197...36K 2011ApJS..197...36K), the WFC3 Early Release Science program (ERS;
Windhorst et al., 2011ApJS..193...27W 2011ApJS..193...27W), and the Hubble Ultra Deep
Field (HUDF09) program (Bouwens et al., 2010ApJ...709L.133B 2010ApJ...709L.133B).
GOODS-South contains near complete spectroscopic coverage in the
Near-InfraRed (NIR) with two-orbit depth HST/WFC3 G141 grism
observations taken by the 3D-HST survey (PI: P. van Dokkum; Brammer et
al., 2012ApJS..200...13B 2012ApJS..200...13B) and the WFC3 ERS program (Straughn et al.
2011, cat. J/AJ/141/14), corresponding to a limiting line flux of
3*10-17erg/s/cm2. The spectra each cover a wavelength range of
1.1≤λ≤1.7µm with a resolving power R∼130
(46.5Å/pixel) for point sources. thus providing rest-frame optical
spectra for galaxies out to z∼3.5. The catalog is selected in the
H-band (F160W) and includes both galaxies with and without previously
published spectroscopic redshifts. Grism spectra are extracted for all
H-band detected galaxies with H-band magnitude≤24 and a CANDELS
photometric redshift zphot≥0.6.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 1018 Grism redshift catalog of sources in GOODS-S
table2.dat 84 20 Grism-identified pairs in GOODS-S
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJ/780/34 : H160-selected galaxies in the HUDF (Lundgren+, 2014)
J/A+A/549/A63 : GMASS photometry (Kurk+, 2013)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013)
J/MNRAS/425/2116 : Arizona CDFS Environment Survey, ACES (Cooper+, 2012)
J/ApJ/743/146 : HST/WFC3 observations in HUDF and GOODS-S (Cameron+, 2011)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/AJ/141/14 : HST WFC3 ERS : emission-line galaxies (Straughn+, 2011)
J/ApJ/735/L22 : HUDF galaxy properties at z∼2 (Szomoru+, 2011)
J/ApJS/191/124 : Optical spectroscopy of ECDF-S X-ray sces (Silverman+, 2010)
J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)
J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)
J/ApJ/668/839 : Spectrophotometric redshifts for HUDF galaxies (Ryan+, 2007)
J/A+A/465/1099 : Redshift catalog of 691 objects in CDFS (Ravikumar+, 2007)
J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005)
J/ApJS/155/271 : Chandra Deep Field-Sth: Optical spectroscopy (Szokoly+, 2004)
J/ApJ/613/200 : Hubble Higher z Supernova Search, HHZSS (Strolger+, 2004)
J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)
J/MNRAS/328/150 : KX redshift survey (Croom+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Galaxy [36/26833] Source number from Guo et al. 2013
(cat. J/ApJS/207/24)
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000)
31- 35 F5.2 mag Hmag [19.4/25.3] H-band (F160W) magnitude (AB) from
Guo et al. 2013 (cat. J/ApJS/207/24)
37- 41 F5.3 --- zgr [0.67/3.47] Redshift derived from G141 grism
spectrum (1)
43- 48 F6.3 --- zsp [0.31/3.47]? Redshift from Master Spectroscopic
Catalog (2)
50- 91 A42 --- Line Identification of emission line(s) used for
redshift determination (3)
93- 95 F3.1 --- q_zgr [2/4] Redshift quality flag, 4=best (4)
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Note (1): The resulting catalog contains new grism redshifts for 608 galaxies
which have no previously published spectroscopic redshift in the
GOODS-South field. These redshifts include 234 new redshifts for galaxies
at z≥1.5. The catalog also contains grism redshifts for 411 galaxies which
have existing redshifts in the literature.
Note (2): The Master Spectroscopic Catalog refers to the following compilation:
* Croom et al. 2001 (cat. J/MNRAS/328/150),
* Daddi et al. (2004ApJ...600L.127D 2004ApJ...600L.127D),
* Le Fevre et al. 2004 (cat. J/A+A/428/1043),
* Strolger et al. 2004 (cat. J/ApJ/613/200),
* Ravikumar et al. 2007 (cat. J/A+A/465/1099),
* Kriek et al. (2007ApJ...669..776K 2007ApJ...669..776K),
* Mignoli et al. 2005 (cat. J/A+A/437/883),
* Wolf et al. 2008 (cat. II/253),
* van der Wel et al. (2004ApJ...601L...5V 2004ApJ...601L...5V),
* Szokoly et al. 2004 (cat. J/ApJS/155/271),
* Vanzella et al. 2008 (cat. J/A+A/478/83),
* Huang (2009ApJ...700..183H 2009ApJ...700..183H),
* Vanzella et al. (2009ApJ...695.1163V 2009ApJ...695.1163V),
* Wuyts et al. (2009ApJ...706..885W 2009ApJ...706..885W),
* Balestra et al. 2010 (cat. J/A+A/512/A12),
* Silverman et al. 2010 (cat. J/ApJS/191/124),
* Trump et al. (2013ApJ...763L...6T 2013ApJ...763L...6T),
* Kurk et al. 2013 (cat. J/A+A/549/A63),
* Cooper et al. 2012 (cat. J/MNRAS/425/2116),
* Xue et al. 2011 (cat. J/ApJS/195/10), and the
* ESO GOODS/CDF-S Master Catalog:
www.eso.org/sci/activities/garching/projects/goods/MasterSpectroscopy.html
Note (3): [OII] and [OIII] refer always to the [OII] 3727A+3729Å and
[OIII] 4959A+5007Å emission line doublets.
Note (4): The quality scheme for the derived redshift is:
2.0 = Single high signal-to-noise emission line and redshift does not agree
with 68% confidence interval of photometric redshift. Examples of spectra
correlating to each quality flag can be seen in Figure 3. While quality
3.0 and 4.0 redshifts are the most reliable, given the multiple emission
lines identified, we show in Section 4.2 that sources assigned a quality
of 2.0 or 2.5 demonstrate excellent agreement with prior spectroscopic
redshift measurements.
2.5 = Single high signal-to-noise emission line and redshift agrees with 68%
confidence interval of photometric redshift.
3.0 = Combination of high and low signal-to-noise emission lines.
4.0 = Multiple high signal-to-noise emission lines.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Galaxy1 [722/24564] Number of the first source (from
Guo et al. 2013, cat. J/ApJS/207/24)
7- 11 I5 --- Galaxy2 [726/24904] Number of the second source (from
Guo et al. 2013, cat. J/ApJS/207/24)
13- 21 F9.6 deg RAdeg Right ascension in decimal degrees (J2000)
for the first source
23- 32 F10.6 deg DEdeg Declination in decimal degrees (J2000)
for the first source
34- 42 F9.6 deg RA2deg Right ascension in decimal degrees (J2000)
for the second source
44- 53 F10.6 deg DE2deg Declination in decimal degrees (J2000)
for the second source
55- 59 F5.3 --- z1 [0.787/2.327] Redshift for the first source (1)
61- 65 F5.3 --- z2 [0.787/2.334] Redshift for the second source (1)
67- 71 F5.3 arcsec Asep [0.847/6.034] Angular separation
73- 78 F6.3 kpc Psep [6.994/49.31] Projected separation
80- 84 F5.3 --- M1/M2 [0.845/1.1] Mass ratio
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Note (1): Combining the grism redshifts in our catalog with our master
spectroscopic catalog, we have identified 20 galaxy pair candidates in
GOODS-South with at least one member whose redshift comes from the new
WFC3/G141 spectra. Five of the pairs are comprised of two galaxies with
new grism redshifts and 15 are grism sources with companions that appear
in our master spectroscopic catalog.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 10-Jun-2015