J/AJ/128/1558 NOAO Fundamental Plane Survey (Smith+, 2004)
NOAO Fundamental Plane Survey. I. Survey design, redshifts, and velocity
dispersion data.
Smith R.J., Hudson M.J., Nelan J.E., Moore S.A.W., Quinney S.J.,
Wegner G.A., Lucey J.R., Davies R.L., Malecki J.J., Schade D.,
Suntzeff N.B.
<Astron. J., 128, 1558-1569 (2004)>
=2004AJ....128.1558S 2004AJ....128.1558S
ADC_Keywords: Clusters, galaxy ; Redshifts ; Velocity dispersion
Keywords: galaxies: clusters: general - galaxies: distances and redshifts -
galaxies: elliptical and lenticular, cD - surveys
Abstract:
We introduce the NOAO Fundamental Plane Survey (NFPS), a wide-field
imaging/spectroscopic study of rich, low-redshift galaxy clusters. The
survey targets X-ray-selected clusters at 0.010<z<0.067,
distributed over the whole sky, with imaging and spectroscopic
observations obtained for 93 clusters. This data set will be used in
investigations of galaxy properties in the cluster environment and of
large-scale velocity fields through the fundamental plane. In this
paper, we present details of the cluster sample construction and the
strategies employed to select early-type galaxy samples for
spectroscopy. Details of the spectroscopic observations are reported.
From observations of 5479 red galaxies, we present redshift
measurements for 5388 objects and internal velocity dispersions for
4131. The velocity dispersions have a median estimated error ∼7%. The
NFPS has ∼15% overlap with previously published velocity dispersion
data sets. Comparisons to these external catalogs are presented and
indicate typical external errors of ∼8%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 114 The NFPS Cluster Sample
table5.dat 85 5479 Merged Spectroscopic Data for NFPS Galaxies
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
J/MNRAS/281/799 : XBACs, the sample (Ebeling+, 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 11 I2 h RAh Hour of right ascension (J2000) (1)
13- 14 I2 min RAm Minute of right ascension (J2000) (1)
16- 19 F4.1 s RAs Second of right ascension (J2000) (1)
21 A1 --- DE- Sign of the Declination (J2000) (1)
22- 23 I2 deg DEd Degree of declination (J2000) (1)
25- 26 I2 arcmin DEm Arcminute of declination (J2000) (1)
28- 29 I2 arcsec DEs Arcsecond of declination (J2000) (1)
31- 36 F6.2 deg GLON Galactic longitude
38- 43 F6.2 deg GLAT Galactic latitude
45- 46 A2 --- Type Center type (2)
48- 52 I5 km/s cz Recession velocity in the CMB frame (3)
54- 56 I3 km/s e_cz ? Error in cz
58- 60 I3 --- o_cz ? Number of galaxy redshifts used in cz
62- 67 F6.2 fW/m2 FX ? ROSAT 0.1-2.4keV bandpass flux in
units of 10-12ergs/s/cm2 (4)
69- 72 F4.2 10+37W LX ? ROSAT 0.1-2.4keV bandpass luminosity
in units of 10+44ergs/s (4)
74 A1 --- Sample [ABC] Selection subsample to which the
cluster belongs (5)
76- 78 A3 --- Cat X-ray catalog from which the cluster was
selected (6)
80- 82 I3 --- Num ? Number of member galaxies with velocity
dispersion measurements in this paper
84- 86 A3 --- Source Source of NFPS spectra (7)
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Note (1): The coordinates are those of the cluster center, as judged from
visual examination of Digitized Sky Survey and ROSAT data.
Note (2): Center type is defined as follows:
DX = Coordinates of a dominant galaxy coincident (or nearly so) with
X-ray peak;
GX = Coordinates derived from average of several prominent galaxies
coincident (or nearly so) with X-ray peak;
XP = Coordinates of an X-ray emission peak, without a clear dominant
galaxy;
XC = Coordinates from approximate centroid of large-scale X-ray emission,
ignoring local peaks.
Note (3): The cluster redshifts are derived from our own spectroscopic data
where possible, otherwise they are from BCS/XBACS. Where our data
are used, we give the error and number of galaxy redshifts.
Note (4): Fluxes corrected according to Hogg & Turner (1998PASP..110..727H 1998PASP..110..727H) to
reflect the systematic bias affecting low signal-to-noise ratio (S/N)
object detection.
Note (5): Selection subsample to which the cluster belongs, defined as follows:
A = The A subsample is limited to zCMB<0.06 in order to reduce the number
of the most distant clusters, for which morphological analysis requires
excellent image quality. The A clusters are further selected by X-ray
luminosity. We impose luminosity cuts:
LX,c>5.0x1043ergs/s for 0.04<z<0.06 and
LX,c>2.0x1043ergs/s for z<0.04.
The final A subsample is then composed of two overlapping subsets, each
volume-limited in X-ray luminosity. Note that these redshift-luminosity
limits correspond to a minimum flux of fX,c∼6x10-12ergs/cm2/s,
comfortably above the BCS/XBACs flux limits.
B = Clusters not belonging to the A subsample, but making the original
selection cuts, form the "B" subsample.
C = A few clusters that do not meet the overall selection criteria
nonetheless have NFPS data; these are retained as a "C" subsample.
Note (6): The X-ray catalog from which the cluster was selected from is defined
as follows:
BCS = Brightest cluster sample (Cat. J/MNRAS/301/881);
XBA = X-ray brightest Abell clusters (Cat. J/MNRAS/281/799).
Note (7): Source of NFPS spectra, defined as follows:
W = WIYN (Wisconsin Iowa Yale NOAO Observatory);
C = CTIO (Cerro Tololo Inter-American Observatory).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NFP]
4- 19 A16 --- NFP Galaxy identification (NFP JHHMMSS.s+DMMSS)
21- 29 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) (1)
31- 39 F9.5 deg DEdeg Declination in decimal degrees (J2000) (1)
41 I1 --- o_cz ? Number of merged individual measurements
in cz
43- 47 I5 km/s cz ? Heliocentric redshift
49- 51 I3 km/s e_cz ? Error in cz
53- 55 I3 --- S/N-cz ? Effective total signal-to-noise ratio
(per Angstroem) in cz
57 I1 --- o_logS ? Number of merged individual measurements
in log S (2)
59- 64 F6.4 [km/s] logS ? Logarithm of the velocity dispersion (3)
66- 71 F6.4 [km/s] e_logS ? Error n logS
73- 75 I3 --- S/N-logS ? Effective total signal-to-noise ratio
(per Angstroem) in logS
77- 84 A8 --- Cluster Cluster to which the galaxy is assigned (4)
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Note (1): Coordinates are expected to be accurate to ≲1".
Note (2): Only spectra with SN-logS>15 are allowed to contribute to the
merged data, so in some cases SN-logS>SN-cz.
Note (3): Values are as observed through a 2" diameter fiber; no
aperture corrections have been applied.
Note (4): Cluster to which the galaxy is assigned by the algorithm
discussed in the text. Missing data in this column indicate either
that no redshift measurement was achieved or that the galaxy is not
assigned to any cluster. Stars are indicated by the entry "star".
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 18-Apr-2005