J/ApJS/227/3 Full spectroscopic data release of the SPT-GMOS (Bayliss+, 2016)
SPT-GMOS: a Gemini/GMOS-South spectroscopic survey of galaxy clusters
in the SPT-SZ survey.
Bayliss M.B., Ruel J., Stubbs C.W., Allen S.W., Applegate D.E.,
Ashby M.L.N., Bautz M., Benson B.A., Bleem L.E., Bocquet S., Brodwin M.,
Capasso R., Carlstrom J.E., Chang C.L., Chiu I., Cho H.-M., Clocchiatti A.,
Crawford T.M., Crites A.T., de Haan T., Desai S., Dietrich J.P.,
Dobbs M.A., Doucouliagos A.N., Foley R.J., Forman W.R., Garmire G.P.,
George E.M., Gladders M.D., Gonzalez A.H., Gupta N., Halverson N.W.,
Hlavacek-Larrondo J., Hoekstra H., Holder G.P., Holzapfel W.L., Hou Z.,
Hrubes J.D., Huang N., Jones C., Keisler R., Knox L., Lee A.T.,
Leitch E.M., von der Linden A., Luong-Van D., Mantz A., Marrone D.P.,
McDonald M., McMahon J.J., Meyer S.S., Mocanu L.M., Mohr J.J., Murray S.S.,
Padin S., Pryke C., Rapetti D., Reichardt C.L., Rest A., Ruhl J.E.,
Saliwanchik B.R., Saro A., Sayre J.T., Schaffer K.K., Schrabback T.,
Shirokoff E., Song J., Spieler H.G., Stalder B., Stanford S.A.,
Staniszewski Z., Stark A.A., Story K.T., Vanderlinde K., Vieira J.D.,
Vikhlinin A., Williamson R., Zenteno A.
<Astrophys. J. Suppl. Ser., 227, 3-3 (2016)>
=2016ApJS..227....3B 2016ApJS..227....3B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, spectra ; Surveys ;
Equivalent widths ; Photometry, SDSS
Keywords: catalogs; galaxies: clusters: general;
galaxies: distances and redshifts; techniques: spectroscopic
Abstract:
We present the results of SPT-GMOS, a spectroscopic survey with the
Gemini Multi-Object Spectrograph (GMOS) on Gemini South. The targets
of SPT-GMOS are galaxy clusters identified in the SPT-SZ survey, a
millimeter-wave survey of 2500deg2 of the southern sky using the
South Pole Telescope (SPT). Multi-object spectroscopic observations of
62 SPT-selected galaxy clusters were performed between 2011 January
and 2015 December, yielding spectra with radial velocity measurements
for 2595 sources. We identify 2243 of these sources as galaxies, and
352 as stars. Of the galaxies, we identify 1579 as members of SPT-SZ
galaxy clusters. The primary goal of these observations was to obtain
spectra of cluster member galaxies to estimate cluster redshifts and
velocity dispersions. We describe the full spectroscopic data set and
resulting data products, including galaxy redshifts, cluster
redshifts, and velocity dispersions, and measurements of several
well-known spectral indices for each galaxy: the equivalent width, W,
of [OII]λλ3727, 3729 and H-δ, and the 4000Å
break strength, D4000. We use the spectral indices to classify
galaxies by spectral type (i.e., passive, post-starburst,
star-forming), and we match the spectra against photometric catalogs
to characterize spectroscopically observed cluster members as a
function of brightness (relative to m*). Finally, we report several
new measurements of redshifts for ten bright, strongly lensed
background galaxies in the cores of eight galaxy clusters. Combining
the SPT-GMOS data set with previous spectroscopic follow-up of SPT-SZ
galaxy clusters results in spectroscopic measurements for >100
clusters, or ∼20% of the full SPT-SZ sample.
Description:
The data presented in this paper follow the same observational design
described by Ruel et al. (2014ApJ...792...45R 2014ApJ...792...45R). The final Gemini-S
observing allocation for SPT-GMOS concluded at the end of the 2015B
semester. Over the course of the entire survey we observed 121
individual spectroscopic masks targeting 62 SPT-SZ galaxy clusters
(see table 1). All final data products from SPT-GMOS are publicly
released via the Harvard Dataverse Network
(http://dataverse.harvard.edu/dataverse/SPT_Clusters).
The galaxy clusters observed in the SPT-GMOS are all drawn from the
SPT-SZ survey, completed in 2011 November. The full SPT-SZ survey
covered approximately 2500deg2 of the southern sky at 95, 150, and
220GHz with an angular resolution of ∼1'.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 101 121 Gemini/GMOS-South observations of
SPT-SZ galaxy clusters
table2.dat 70 62 Spectroscopy of SPT clusters: results
table3.dat 183 2243 SPT-GMOS data products for candidate
brightest cluster galaxy spectra
table4.dat 151 15 Giant arc redshift constraints
sp/* . 121 Slit-mask directories containing the individual
spectra FITS files
--------------------------------------------------------------------------------
Description of file: The directory sp/* contains the reduced
1-dimensional spectra (see also tables 1 and 3).
-----------------------------
Directories of 1D spectra:
-----------------------------
Spectra are organized by the individual slit-masks from which they came. Each
slitmask has it's own directory with a standard naming format. Directory
names are formatted based on the unique combination of Gemini program ID and
mask number associated with each slit mask: YYSTPPmNN
where the characters are determined by the following:
YY is the final two digits of the year in the Gemini program ID
(e.g., YY=12 indicates a 2012 program).
S is the semester of the Gemini program ID (e.g., this is always
either A or B, referring to the northern hemisphere spring and fall semesters,
respectively).
T is the type of program from the Gemini program ID. This character always has
one of two values: "Q" indicates a queue program, and
"C" indicates a classial program.
PP is the program number from the Gemini program ID.
NN is the mask number of the slitmask.
To give an example, spectra that result from mask number 1 in the
Gemini program GS-2011B-C-6 would have a directory name, 11BC06m01.
-----------------------------
Fromatting of 1D spectra:
-----------------------------
All 1D spectra are stored in individual .fits files with filenames generated
using a standard convention. Spectra files have the following format:
sptRRRRDDDDYYSTPPmNNXXF.fits
The RRRR and DDDD strings are the sexagesimal hours and minutes (RA) and
degrees and Arcminutes (Dec), respectively, of the SPT-SZ galaxy cluster's
astrometric coordinates. The one caveat here is that some of these
coordinate-based strings may differ slightly across SPT publications due to
differences in the truncation/rounding schemes used to identify SPT-SZ galaxy
clusters at different times. This said, any differences in cluster names will
be at most one minute or arcminute in each of RA and Dec.
The YYSTPPmNN string describes the individual slitmask that a given spectrum
came from, identically to the directory names described above, and
the XX string indicates the number of the slit that produced the 1D spectrum.
Each 1D spectrum .fits file uses the multi-extension fits (MEF) format. The
first extension a 1-D array of flux values, the second extension is a 1-D
array of flux uncertainty values, and the third extension is a 1-D array of
wavelength values for the center of the wavelengths bins into which the flux
and uncertainties were extracted. The wavelength arrays are in angstroms, and
the flux and flux uncertainty arrays are in units of 10-16ergs/s/cm2/Å.
See also:
IX/49 : XXL Survey: First results (Pierre+, 2016)
J/MNRAS/449/4010 : SALT galaxy clusters detected by ACT (Kirk+, 2015)
J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)
J/ApJ/774/23 : Chandra observations of SPT-SZ clusters (McDonald+, 2013)
J/ApJ/772/25 : Massive SZE clusters observations with ACT (Sifon+, 2013)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/ApJ/763/127 : Galaxy clusters discovered in SPT survey (Reichardt+, 2013)
J/ApJ/761/22 : NIR galaxy cluster candidates in the SPT survey (Song+, 2012)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/ApJ/684/905 : z>1 gal. clusters from IRAC Shallow Survey (Eisenhardt+, 2008)
J/ApJS/172/561 : The 400d cluster Survey (Burenin+, 2007)
J/ApJ/660/239 : MaxBCG catalog of galaxy clusters from SDSS (Koester+, 2007)
J/AJ/127/2455 : Gemini Deep Deep Survey (GDDS) (Abraham+, 2004)
J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000)
http://dataverse.harvard.edu/dataverse/SPT_Clusters : SPT Galaxy Cluster
Followup Harvard Dataverse
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
8- 17 A10 --- SPT-CL Cluster name (JHHMM+DDMM)
19- 20 I2 h RAh Cluster hour of right ascension (J2000)
22- 23 I2 min RAm Cluster minute of right ascension (J2000)
25- 28 F4.1 s RAs Cluster second of right ascension (J2000)
30 A1 --- DE- Sign of declination (J2000)
31- 32 I2 deg DEd Degree of declination (J2000)
34- 35 I2 arcmin DEm Arcminute of declination (J2000)
37- 38 I2 arcsec DEs Arcsecond of declination (J2000)
40- 44 F5.2 --- xi [5/27.5]? Significance ξ from SPT-SZ survey
46 A1 --- f_xi [a] Flag on xi (1)
48- 60 A13 --- PID Gemini program ID
62- 63 I2 --- Mask [1/59] Mask number within the Gemini program
65- 74 A10 --- Grating Grating used
76- 86 A11 --- Filter The order-sorting filter used (if any)
88- 91 I4 0.1nm lamC1 Lower range of central wavelength
λC, in Å
92 A1 --- --- [,]
93- 96 I4 0.1nm lamC2 Upper range of central wavelength
λC, in Å
98-101 I4 s Exp [1500/6600] Total integration time for which
the mask was exposed
--------------------------------------------------------------------------------
Note (1):
a = There is not a reliable SZ measurement available for this cluster
due to a nearby millimeter-bright point source.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
7- 16 A10 --- SPT-CL Cluster name (JHHMM+DDMM) (1)
17- 18 A2 --- f_SPT-CL [ ab] Flag(s) on SPT-CL (2)
20- 21 I2 --- Nsp [11/67] Total number of spectra with
radial velocity measurements
23- 24 I2 --- NMm [4/44] Number of cluster member galaxies
26- 31 F6.4 --- z [0.29/1.04] Median cluster redshift
33- 38 F6.4 --- e_z [0.002/0.02] Uncertainty in z
40- 43 I4 km/s sigmaBI [546/1932] Bi-weight derived velocity
dispersion estimate
45- 47 I3 km/s e_sigmaBI [92/724] Uncertainty in sigmaBI
49- 52 I4 km/s sigmaG [520/1941] Gapper derived velocity
dispersion estimate
54- 56 I3 km/s e_sigmaG [94/747] Uncertainty in sigmaG
58- 62 F5.3 --- A2 [0.1/2.2] AD test statistic (3)
64- 70 F7.5 --- alpha Probability cluster velocity drawn from
Gaussian velocity distribution
--------------------------------------------------------------------------------
Note (1): SPT-CL J0212-4656 has been replaced by SPT-CL J0212-4657 and
SPT-CL J0406-4804 by SPT-CL J0406-4805 by CDS for consistency
with Tables 1 and 3 and with the SPT-SZ data
(e.g. Bleem+, 2015, J/ApJS/216/27).
Note (2):
a = Cluster also presented in Ruel et al. (2014ApJ...792...45R 2014ApJ...792...45R).
b = Numbers here are computed from SPT-GMOS data only, but are fully
consistent with the results combining these data with spectra from
other facilities in Ruel et al. (2014ApJ...792...45R 2014ApJ...792...45R).
Note (3): The Anderson-Darling (AD) test is among the most statistically
powerful tests for detecting departure from normality.
We therefore compute the AD test statistic, in which A2* for the
ordered data, xi, is defined as in Equation (1):
A2*=A2(1+0.75/n+2.245/n2).
See section 4.2.1 for further explanations.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [SPT-CL]
7- 16 A10 --- SPT-CL Cluster name (JHHMM+DDMM)
18- 36 A19 --- Gal Galaxy name (JHHMMSS.ss+DDMMSS.s)
38- 48 F11.7 deg RAdeg Galaxy Right Ascension in decimal degrees (J2000)
50- 60 F11.7 deg DEdeg Galaxy Declination in decimal degrees (J2000)
62- 69 F8.6 --- z [0.072/2] Measured galaxy spectroscopic redshift
71- 78 F8.6 --- e_z [0/0.003] Uncertainty in z
80- 86 F7.2 0.1nm EW-O2 [-792/206]?=999.99 Equivalent width of
[OII]3727Å line, in Angstroms
88- 94 F7.2 0.1nm e_EW-O2 [0.4/470]?=-999.99 Uncertainty in EW-O2
96-102 F7.2 0.1nm EW-Hd [-768/385]?=999.99 Equivalent width of
Hδ line, in Angstroms
104-110 F7.2 0.1nm e_EW-Hd [0.1/441]?=-999.99 Uncertainty in EW-Hd
112-118 F7.2 --- D4000 [0.1/21]?=999.99 Strength of 4000Å break
120-126 F7.2 --- e_D4000 [0.01/11.2]?=-999.99 Uncertainty in D4000
128-133 F6.2 mag rmag [17.2/26.2]?=-99.99 r band AB magnitude
in SDSS system (1)
135-140 F6.2 mag imag [16.6/24]?=-99.99 i band AB magnitude
in SDSS system (1)
142-183 A42 --- File Spectrum file name in subdirectory "sp"
--------------------------------------------------------------------------------
Note (1): The transformed r- and i-band magnitudes that we recover have typical
total uncertainties of ∼0.1 magnitudes. See section 5.2 for further
explanations.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- n_z Note on z (1)
3- 8 A6 --- --- [SPT-CL]
10- 19 A10 --- SPT-CL SPT cluster lens identifier (JHHMM+DDMM)
21- 23 A3 --- Arc Arc identifier
25- 26 I2 h RAh [1/23] Hour of right ascension (J2000)
28- 29 I2 min RAm Minute of right ascension (J2000)
31- 35 F5.2 s RAs Second of right ascension (J2000)
37 A1 --- DE- [-] Sign of declination (J2000)
38- 39 I2 deg DEd [41/62] Degree of declination (J2000)
41- 42 I2 arcmin DEm Arcminute of declination (J2000)
44- 47 F4.1 arcsec DEs Arcsecond of declination (J2000)
49- 54 F6.4 --- z [0.6/2.7]? Redshift
56- 61 F6.4 --- e_z [0.0002/0.001]? z uncertainty
63- 66 F4.2 --- zlo [0.8/1.8]? Lower limit on z
68- 70 F3.1 --- zup [2.3/3.9]? Upper limit on z
72-151 A80 --- Comm Spectral features and comments
--------------------------------------------------------------------------------
Note (1): Code as follows:
s = solid redshift: high-confidence measurements that appear in the SPT-GMOS
spectroscopic catalogs
p = possible redshift: best-guess measurements; represent the most likely
redshift for these sources based on a small number of very weak
spectroscopic features, but could be misinterpretations of the data.
l = redshift limits: constraints that we place on the redshifts of sources
based on the lack of identifiable spectroscopic features in the
available data.
--------------------------------------------------------------------------------
Nomenclature note:
Galaxies of Table 3 are <[BRS2016] JHHMMSS.ss+DDMMSS.s> in Simbad;
Gravitational lensed images of Table 4
are <[BRS2016] SPT-CL JHHMM+DDMM A.N> in Simbad.
History:
From electronic version of the journal for the final data release catalog
From http://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/OR13NN&version=2.0 for the reduced 1D spectra
25-Jan-2017: Insert into VizieR
25-Mar-2019: Table 4 added
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Dec-2016