J/MNRAS/392/135 Galaxy clusters from SDSS (Lopes+, 2009)
NoSOCS in SDSS. I. Sample definition and comparison of mass estimates.
Lopes P.A.A., De Carvalho R.R., Kohl-Moreira J.L., Jones C.
<Mon. Not. R. Astron. Soc., 392, 135-152 (2009)>
=2009MNRAS.392..135L 2009MNRAS.392..135L
ADC_Keywords: Surveys ; Clusters, galaxy
Keywords: surveys - galaxies: clusters: general -
galaxies: kinematics and dynamics
Abstract:
We use Sloan Digital Sky Survey (SDSS) data to investigate galaxy
cluster properties of the systems first detected within Digitized
Second Palomar Observatory Sky Survey. With the high-quality
photometry of SDSS, we derived new photometric redshifts and estimated
richness and optical luminosity. For a subset of low-redshift (z≤0.1)
clusters, we have used SDSS spectroscopic data to identify groups in
redshift space in the region of each cluster, complemented with
massive systems from the literature to assure the continuous mass
sampling. A method to remove interlopers is applied, and a virial
analysis is performed resulting in the estimates of velocity
dispersion, mass and a physical radius for each low-z system.
Description:
The work presented here is based on the supplement version of the
NoSOCS (Lopes, 2003, PhD thesis, Observatorio Nacional (Brazil;
Lopes et al,. 2004, Cat. J/AJ/128/1017). NoSOCS (Gal et al.,
2000AJ....119...12G 2000AJ....119...12G, 2003, Cat. J/AJ/125/2064; 2009, J/AJ/137/2981) is
a catalogue of galaxy clusters constructed from the digitized version
of the Second Palomar Observatory Sky Survey (POSS-II; DPOSS). Hence,
we decided to complement our sample with the one including massive
systems studied by Rines & Diaferio (2006, cat. J/AJ/132/1275). Their
sample comprises 74 X-ray-selected clusters at z≤0.1 within the SDSS
Date Release 4 (DR4; see their table 1). This set is named Cluster
Infall Regions in SDSS (CIRS).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 127 Main properties of the 127 NoSOCS clusters at
z≤0.01 and with at least 10 member galaxies
table2.dat 108 127 Velocity dispersion, characteristic radii and
masses of 127 NoSOCS clusters
table3.dat 108 56 Main properties of the 56 CIRS clusters
(J/AJ/132/1275) at z≤0.01 and with at least
10 member galaxies
table4.dat 108 56 Velocity dispersion, characteristic radii and
masses of the 56 CIRS clusters
table5.dat 87 183 *X-ray luminosity and temperature of the
NoSOCS plus CIRS clusters
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Note on table5.dat: We fixed a bug in the code used to estimate the X-ray
luminosity and its associated error. Hence, this is the updated table,
presented in Paper II (Lopes et al., 2009MNRAS.399.2201L 2009MNRAS.399.2201L) as table A1.
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See also:
J/AJ/125/2064 : Northern Optical Cluster Survey. II. (Gal+, 2003)
J/AJ/137/2981 : Northern Optical Cluster Survey. III. (Gal+, 2009)
J/AJ/128/1017 : Northern Optical Cluster Survey. IV. (Lopes+, 2005)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I. (Rines+, 2006)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name (1)
21- 29 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
31- 39 F9.5 deg DEdeg Declination in decimal degrees (J2000)
41- 46 F6.4 --- zhel Heliocentric redshift (from CIRS for table3)
48- 53 F6.4 --- zhel2 ? New heliocentric redshift, from SDSS,
(only for table3)
55- 59 F5.1 --- Ngal Number of galaxies (richness)
61- 64 F4.1 --- e_Ngal rms uncertainty on Ngal
66- 70 F5.3 10+12Lsun Lopt Optical luminosity
72- 76 F5.3 10+12Lsun e_Lopt rms uncertainty on Lopt
78- 83 F6.1 --- beta ?=-10.0 Asymetry (beta parameter) (2)
84- 85 A2 --- --- [00]
87- 93 F7.3 --- e_beta ?=-99.000 rms uncertainty on beta
95-101 F7.3 --- delta ?=-9.999 Cumulative deviation
(Δ parameter) (2)
103-108 F6.3 --- e_delta ?=-9.999 rms uncertainty on delta
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Note (1): NSCS JHHMMSS+DDMMSS in table1.
Note (2): Parameters obtained from the substructure tests and their
significance (see Section 5 of paper)
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Byte-by-byte Description of file: table[24].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name
21- 26 F6.1 km/s sig Line-of-sight velocity dispersion
28- 32 F5.1 km/s e_sig Error on sig (lower limit)
34- 38 F5.1 km/s E_sig Error on sig (upper limit)
40- 42 I3 --- Nm Number of cluster members used for that
estimate
44- 46 I3 --- N200 Number of cluster members within R200
48- 51 F4.2 Mpc R500 Radius R500 (1)
53- 56 F4.2 Mpc e_R500 Error on R500 (lower limit)
58- 61 F4.2 Mpc E_R500 Error on R500 (upper limit)
63- 67 F5.2 10+14Msun M500 Mass for a radius of R500
69- 72 F4.2 10+14Msun e_M500 Error on M500 (lower limit)
74- 77 F4.2 10+14Msun E_M500 Error on M500 (upper limit)
79- 82 F4.2 Mpc R200 Radius R200 (1)
84- 87 F4.2 Mpc e_R200 Error on R200 (lower limit)
89- 92 F4.2 Mpc E_R200 Error on R200 (upper limit)
94- 98 F5.2 10+14Msun M200 Mass for a radius of R200
100-103 F4.2 10+14Msun e_M200 Error on M200 (lower limit)
105-108 F4.2 10+14Msun E_M200 Error on M200 (upper limit)
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Note (1): Radius defined as:
R200 = RA(ρ[200ρc(z)])1/2 and
R500 = RA(ρV[200ρc(z)])1/2 where
* RA is the Radius
* ρV=3MV(3πRA3)
* MV is the virial mass in a volume of radius RA
* ρc(z) is the critical density at redshift z
* M500 is the virial mass for RA=R500,
* M200 is the virial mass for RA=R200.
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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- 19 A19 --- Name Cluster name
21- 26 F6.3 10+37W LXa ?=99.999 Annulus background X-ray luminosity
28- 33 F6.3 10+37W e_LXa ?=99.999 rms uncertainty on LXa
35- 40 F6.3 10+37W LXf ?=99.999 Frame background X-ray luminosity
42- 47 F6.3 10+37W e_LXf ?=99.999 rms uncertainty on LXf
49- 54 F6.3 10+37W LXb ?=99.999 Box background X-ray luminosity
56- 61 F6.3 10+37W e_LXb ?=99.999 rms uncertainty on LXb
63- 67 F5.2 keV TXB ?=- BAX X-ray temperature (1)
70- 73 F4.2 keV e_TXB ?=- Error on TXB (lower limit)
76- 79 F4.2 keV E_TXB ?=- Error on TXB (upper limit)
81- 85 F5.2 keV TX ?=- Interpolated RASS X-ray temperature
obtained from the LX-TX relation
86- 87 A2 --- Q Detection flag (2)
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Note (1): BAX: X-ray galaxy clusters database, http://bax.ast.obs-mip.fr/
Note (2): Detection flag as follows:
SD = significant detection
UL = upper limit
XX = measurements should be taken with concern
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History:
* 09-Jun-2009: From electronic version of the journal
* 18-Aug-2011: table5 updated from Paper II (Lopes et al., 2009MNRAS.399.2201L 2009MNRAS.399.2201L)
References:
Gal et al., NoSOCS I 2000AJ....119...12G 2000AJ....119...12G
Gal et al., NoSOCS II 2003AJ....125.2064G 2003AJ....125.2064G Cat. J/AJ/125/2064
Gal et al., NoSOCS III 2009AJ....137.2981G 2009AJ....137.2981G Cat. J/AJ/137/2981
Lopes et al., NoSOCS IV 2004AJ....128.1017L 2004AJ....128.1017L Cat. J/AJ/137/2981
Lopes et al., Paper II 2009MNRAS.399.2201L 2009MNRAS.399.2201L
(End) Patricia Vannier [CDS] 11-May-2009