J/AJ/150/153 Team Keck Redshift Survey 2 (TKRS2) (Wirth+, 2015)
The team Keck redshift survey 2: MOSFIRE spectroscopy of the GOODS-north field.
Wirth G.D., Trump J.R., Barro G., Guo Y., Koo D.C., Liu F., Kassis M.,
Lyke J., Rizzi L., Campbell R., Goodrich R.W., Faber S.M.
<Astron. J., 150, 153 (2015)>
=2015AJ....150..153W 2015AJ....150..153W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Redshifts
Keywords: galaxies: distances and redshifts
Abstract:
We present the Team Keck Redshift Survey 2 (TKRS2), a near-infrared
spectral observing program targeting selected galaxies within the
CANDELS subsection of the GOODS-North Field. The TKRS2 program
exploits the unique capabilities of the Multi-Object Spectrometer For
Infra-Red Exploration (MOSFIRE), which entered service on the Keck I
telescope in 2012 and contributes substantially to the study of galaxy
spectral features at redshifts inaccessible to optical spectrographs.
The TKRS2 project targets 97 galaxies drawn from samples that include
z∼2 emission-line galaxies with features observable in the JHK bands
as well as lower-redshift targets with features in the Y band. We
present a detailed measurement of MOSFIRE's sensitivity as a function
of wavelength, including the effects of telluric features across the
YJHK filters. The largest utility of our survey is in providing
rest-frame-optical emission lines for z>1 galaxies, and we demonstrate
that the ratios of strong, optical emission lines of z∼2 galaxies
suggest the presence of either higher N/O abundances than are found in
z∼0 galaxies or low-metallicity gas ionized by an active galactic
nucleus. We have released all TKRS2 data products into the public
domain to allow researchers access to representative raw and reduced
MOSFIRE spectra.
Description:
We present the Team Keck Redshift Survey 2 (TKRS2), a spectroscopic
survey of 97 distant galaxies exploiting the capabilities of the
Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) on the
Keck I telescope at the W. M. Keck Observatory.
MOSFIRE features a 2048*2048 pixel HAWAII-2RG HgCdTe detector array
from Teledyne Imaging Sensors that couples high quantum efficiency
with low noise and low dark current. The operating range of
0.97-2.41µm covers the YJHK infrared passbands, with wavelength
coverage of 0.97-1.12µm in Y, 1.15-1.35µm in J, 1.47-1.80µm
in H, and 1.95-2.40µm in K. The resolving power for the default
slit width of 0.7" is R=3380 in Y, 3310 in J, 3660 in H, and 3620 in
K, corresponding to full-width-half-maximum (FWHM) spectral
resolutions of 3.1Å in Y, 3.7Å in J, 4.4Å in H, and 6.0Å
in K.
Our survey targets the south-central region of the GOODS-North survey
field (Giavalisco et al. 2004, cat. II/261). We employed MOSFIRE to
acquire spectra in the GOODS-North field over a series of partial
nights spanning the period from 2012 November to 2013 May.
We present the results of our survey in Table3 and on the website
(http://arcoiris.ucsc.edu/TKRS2/) devoted to the survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 104 97 Redshift catalog
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJS/207/24 : GOODS-S CANDELS multiwavelength catalog (Guo+, 2013)
J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013)
J/ApJ/762/46 : GOODS-N spectrophotometry survey (Perez-Gonzalez+, 2013)
J/ApJS/193/14 : DEEP3 Galaxy Redshift Survey: GOODS-N field (Cooper+, 2011)
J/ApJ/706/158 : Early-type galaxies in PEARS (Ferreras+, 2009)
J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008)
J/ApJ/653/1004 : Galaxies at 1.4≲z≲3.0 in GOODS-North Field (Reddy+, 2006)
J/AJ/127/3121 : TKRS catalog of GOODS-North Field (Wirth+, 2004)
http://arcoiris.ucsc.edu/TKRS2/ : TKRS2 website
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- TKRS2 [1576/21581] Object identifier in CANDELS catalog
7- 18 F12.8 deg RAdeg Right ascension in decimal degrees (J2000)
20- 30 F11.8 deg DEdeg Declination in decimal degrees (J2000)
32- 40 A9 --- Class Sample class to which the target belongs
(emline, moircs, or quiescent) (1)
42- 46 F5.2 mag F160W [19.39/27.55] Apparent AB magnitude in the F160W
passband (Koekemoer et al.,
2011ApJS..197...36K 2011ApJS..197...36K) (2)
48- 52 F5.3 --- zsp [0.5/3.7]? Presumed redshift from previous
spectroscopic surveys (when available)
54- 63 A10 --- r_zsp Reference for zsp (Barger08, Ferreras09, Reddy06,
or Wirth04) (3)
65- 68 F4.2 --- zph [0.1/3.7] Estimated redshift (4)
70- 72 A3 --- Flt [ JHKY] MOSFIRE passbands in which we observed the
target (Y=0.97-1.12µm, J=1.15-1.35µm,
H=1.47-1.80µm, K=1.95-2.40µm) (5)
74- 76 F3.1 h Exp [1/6.5] Total MOSFIRE exposure time devoted to the
target
78 I1 --- Npa [1/3] Number of different position angles at which
we observed the target (1, 2, or 3)
80- 84 F5.3 --- zM [0.5/3]? Redshift derived from MOSFIRE spectroscopy
86- 88 F3.1 --- q_zM [0/4] Redshift quality parameter (0, 1, 2, 2.5, 3,
or 4) (6)
90-104 A15 --- Sp Identification of specific spectral features
on which we based the redshift measurement (7)
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Note (1): Class described in Section 3 as below:
emline = Galaxy expected to show emission lines ([OII] λλ3726,
3729Å, Hβ λ4861Å, [O III] λλ4959,
5007Å, Hα λ6563Å, [N II] λλ6548,
6583Å, or [S II] λλ6717, 6731Å) at the
appropriate redshifts to be observable in the Y, J, H, or K bands.
See additional details in Section 3.
moircs = Galaxy with previous Subaru+MOIRCS H or K observations in the
MOIRCS Deep Survey of Yoshikawa et al., 2010ApJ...718..112Y 2010ApJ...718..112Y). See
Section 3 for more details.
quiescent = Galaxy with Spectral Energy Distributions (SEDs) indicative of
quiescent stellar populations (i.e., with low specific SFR) and
intended as targets for Y-band spectroscopy. Please refer to
Section 3 for further details about the "quiescent" class.
Note (2): As measured from CANDELS HST WFC3 imagery.
Note (3): Reference code defined as follows:
Wirth04 = Wirth et al. 2004 (cat. J/AJ/127/3121);
Reddy06 = Reddy et al. 2006 (cat. J/ApJ/653/1004);
Barger08 = Barger et al. 2008 (cat. J/ApJ/689/687);
Ferreras09 = Ferreras et al. 2009 (cat. J/ApJ/706/158).
Note (4): Derived via multiband photometry from the CANDELS multiwavelength
catalog in GOODS-N (G. Barro et al., in preparation).
Note (5): MOSFIRE = Multi-Object Spectrometer For Infra-Red Exploration on the
Keck I telescope at the W. M. Keck Observatory.
Note (6): Values of quality codes are described in Section 4.3. as follows:
0.0 = No reported redshift due to lack of identifiable features;
1.0 = Speculative redshift based on a single line which is faint and/or blended
with a sky feature;
2.0 = Ambiguous redshift based on a single line that does not match the
photometric redshift;
2.5 = Ambiguous redshift based on a single line that matches (within
Δz/z<0.15) the prior photometric redshift;
3.0 = Secure (P>95%) redshift, typically including one strong emission feature
and one or more additional weak features;
4.0 = Highly secure (P>99%) redshift, generally exhibiting multiple strong
emission features.
Note (7): Spectral feature defined as follows:
ha = Hα;
hb = Hβ;
n2 = [N II];
ne3 = [Ne III];
o2 = [O II];
o3 = [O III];
s2 = [S II];
? = Marginally detected line.
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 18-Apr-2016