J/ApJS/216/20 Blanco Cosmology Survey (BCS) new reduction (Bleem+, 2015)
A new reduction of the Blanco Cosmology Survey: an optically selected galaxy
cluster catalog and a public release of optical data products.
Bleem L.E., Stalder B., Brodwin M., Busha M.T., Gladders M.D., High F.W.,
Rest A., Wechsler R.H.
<Astrophys. J. Suppl. Ser., 216, 20 (2015)>
=2015ApJS..216...20B 2015ApJS..216...20B
ADC_Keywords: Clusters, galaxy ; Photometry, ugriz ; Surveys ; Redshifts
Keywords: galaxies: clusters: general; surveys; techniques: photometric
Abstract:
The Blanco Cosmology Survey is a four-band (griz) optical-imaging
survey of ∼80deg2 of the southern sky. The survey consists of two
fields centered approximately at (RA,DE)=(23h,-55°) and
(5h30m,-53°) with imaging sufficient for the detection of L*
galaxies at redshift z≤1. In this paper, we present our reduction of
the survey data and describe a new technique for the separation of
stars and galaxies. We search the calibrated source catalogs for
galaxy clusters at z≤0.75 by identifying spatial over-densities of
red-sequence galaxies and report the coordinates, redshifts, and
optical richnesses, λ, for 764 galaxy clusters at z≤0.75. This
sample, >85% of which are new discoveries, has a median redshift of
z=0.52 and median richness λ(0.4L*)=16.4.
Description:
The Blanco Cosmology Survey (BCS; Desai+, 2012, J/ApJ/757/83), an
National Optical Astronomy Observatory (NOAO) large survey program
(2005B-0043), is a four-band (griz) optical-imaging survey that covers
∼80deg2 of the southern sky.
The data presented here were acquired during 57 nights split over six
observing runs between 2005 November and 2008 November using the
MOSAIC II imager on the 4m Blanco Telescope at Cerro Tololo
Inter-American Observatory, Chile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 94 233 Summary information for BCS data presented in
this work
table5.dat 98 349 Optically-selected Galaxy Clusters located in
the 23h BCS field
table6.dat 104 415 Optically-selected Galaxy Clusters located in
the 5h BCS field
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See also:
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
J/ApJS/209/22 : SSDF survey: IRAC catalogs (Ashby+, 2013)
J/ApJ/763/127 : Gal. clusters discovered in the SPT survey (Reichardt+, 2013)
J/ApJ/761/22 : NIR galaxy cluster candidates in the SPT survey (Song+, 2012)
J/ApJ/757/83 : The Blanco Cosmology Survey (BCS) (Desai+, 2012)
J/ApJ/746/178 : The augmented maxBCG cluster catalog (Rykoff+, 2012)
J/ApJS/200/9 : The ACS-GC catalog (Griffith+, 2012)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/ApJ/742/48 : Blanco survey of the lens BCS J2352-5452 (Buckley-Geer+, 2011)
J/ApJ/736/21 : Gal. clusters opt. catalog from AMF on SDSS DR6 (Szabo+ 2011)
J/ApJS/191/340 : Southern Cosmology Survey. II. (Menanteau+, 2010)
J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)
J/ApJS/183/197 : Galaxy clusters identified from the SDSS-DR6 (Wen+, 2009)
J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
J/MNRAS/393/1275 : STAGES master catalog (Gray+, 2009)
J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)
J/ApJ/660/239 : MaxBCG cat. of galaxy clusters from SDSS (Koester+, 2007)
J/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)
http://data.rcc.uchicago.edu/dataset/blanco-cosmology-survey : Blanco
Cosmology Survey datasets
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [BCS]
4- 12 A9 --- BCS Blanco Cosmology Survey tile (HHMM+DDMM)
14- 20 F7.3 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
22- 28 F7.3 deg DEdeg Declination in decimal degrees (J2000) (1)
30- 33 F4.2 arcsec gSee Seeing in g band images (2)
35- 38 F4.2 arcsec rSee Seeing in r band images (2)
40- 43 F4.2 arcsec iSee Seeing in i band images (2)
45- 48 F4.2 arcsec zSee Seeing in z band images (2)
50- 54 F5.2 mag gDepth [22.9/25.1] g band 5σ point source
depth (3)
56- 60 F5.2 mag rDepth r band 5σ point source depth (3)
62- 66 F5.2 mag iDepth i band 5σ point source depth (3)
68- 72 F5.2 mag zDepth [20.7/22.9] z band 5σ point source
depth (3)
74- 78 F5.2 mag Limit [20.1/22.5] Star limit (4)
80- 94 A15 --- Com Comments on tile (5)
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Note (1): From the center of the 36'x36' tiles.
Note (2): The average full width at half maximum of the seeing disk of the
single epoch images that contribute to the coadded images.
Note (3): The point source depths are calculated as in Section 2.3.
Note (4): Corresponds to the faintest i-band magnitude for which we find
robust morphological separation of stars and galaxies as described
in Section 2.6.
Note (5): Comment as follows:
L = A tile utilized in the low-redshift cluster search.
H = A tile searched for higher-redshift systems (see Section 3).
Galactic Cirrus = A tile with prominent Galactic cirrus: poor quality
tile, not used in the cluster search (see section 3.1).
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [LCS-CL]
8- 21 A14 --- LCS-CL Identifier (JHHMMSS+DDMM.m) (1)
23- 30 F8.4 deg RAdeg BCG right Ascension in decimal degrees (J2000)
32- 39 F8.4 deg DEdeg BCG declination in decimal degrees (J2000)
41- 44 F4.2 --- z [0.1/0.8] Red-sequence redshift
46- 50 F5.3 --- e_z [0.02/0.07] Uncertainty in z
52- 55 F4.2 --- Signi [3/7] Detection significance
57- 60 F4.1 --- OR0.4 [10/65] Optical richness λ for z<0.55
62 I1 --- e_OR0.4 Uncertainty in OR0.4
64- 67 F4.1 --- dOR0.4 [0/23] Δλ, amount the optical
richness was boosted to account for masking
69- 73 F5.1 --- OR0.2 ? λ(0.2L*) Optical richness for z<0.55
75 I1 --- e_OR0.2 ? Uncertainty in OR0.2
77- 80 F4.1 --- dOR0.2 ? Δλ(0.2L*), amount OR0.2
was boosted to account for masking
82- 85 F4.2 --- M200 [0/1] Fraction of area masked within 200 kpc
87- 90 F4.2 --- M500 [0/1] Fraction of area masked within 500kpc
92 I1 --- Edge [1]? Edge of tile flag (1=yes, near edge)
94-104 A11 --- PID Previously identified (2)
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Note (1): LCS = Little Cluster Survey; in light of the ongoing Dark Energy
Survey (http://www.darkenergysurvey.org/) which is in the midst of
a 5yr survey that will image 5000deg2 of the southern sky, including
the BCS region. See section 6.
Note (2): Previous ID in reference as follows:
0 = ACO (Abell et al. 1989, VII/110);
1 = REFLEX (Bohringer et al. 2004, J/A+A/425/367);
2 = Southern Cosmology Survey (Menanteau et al. 2009ApJ...698.1221M 2009ApJ...698.1221M;
2010, J/ApJS/191/340; in Simbad);
3 = SPT-SZ Survey (Vanderlinde et al. 2010ApJ...722.1180V 2010ApJ...722.1180V;
Reichardt et al. 2013, J/ApJ/763/127; <SPT-CL JHHMM+DDMM> in Simbad);
4 = Atacama Cosmology Telescope (ACT; Marriage et al. 2011ApJ...737...61M 2011ApJ...737...61M;
<ACT-CL JHHMM+DDMM> in Simbad);
5 = XMM-BCS (Suhada et al. 2012A&A...537A..39S 2012A&A...537A..39S; <[SSB2012] NNN> =
in Simbad);
6 = PLANCK (Planck Collaboration et al. 2014A&A...571A..29P 2014A&A...571A..29P;
see Cat. VIII/91);
7 = Vikhlinin et al. (1998, J/ApJ/502/558; <[VMF98] NNN> in Simbad);
8 = Buckley-Geer et al. (2011, J/ApJ/742/48).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Feb-2015