J/A+A/513/A15 Heidelberg InfraRed Optical Cluster Survey, HIROCS (Roeser+, 2010)
The Heidelberg InfraRed Optical Cluster Survey (HIROCS).
I. Layout, instrumentation, and data analysis.
Roeser H.-J., Hippelein H., Wolf C., Zatloukal M., Falter S.
<Astron. Astrophys., 513, A15-15 (2010)>
=2010A&A...513A..15R 2010A&A...513A..15R
ADC_Keywords: Surveys ; Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters: general - surveys - methods: data analysis
Abstract:
We describe a survey for distant clusters of galaxies that identified
clusters as local overdensities in the 3D galaxy distribution.
Optical and near-IR imaging in B, R, i, z, and H are used to derive
photometric redshifts for objects as faint as m*+1 at a redshift of
1.5. We outline the astrometric and photometric data reduction. The 3D
cluster search, based on the photometric redshifts, is described.
Description:
Optical data in B, R, i, and z were collected with LAICA at the
prime-focus of the Calar Alto 3.5 m-telescope. In addition, we used
the Wide-Field-Imager (WFI) at the 2.2 m-telescope on La Silla during
MPG-time to obtain B and R images.
Observations started in July 2002 with LAICA, in December 2002 with
WFI, and in September 2003 with OMEGA2000. By August 2008, data
collection was complete.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 66 114 Cluster candidates
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number (1)
5- 11 F7.1 pix Xpos X position (2)
13- 19 F7.1 pix Ypos Y position (2)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 30 F4.1 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 40 I2 arcsec DEs Declination (J2000)
42- 46 F5.3 --- Average photometric redshift
48- 50 I3 --- Ngal Number of member galaxies in the cluster
52- 56 F5.1 mag VMAG Total rest-frame absolute V magnitude
58- 60 I3 --- Ngal2 Number of galaxies in the cluster for ez≤0.15
62- 66 F5.3 --- 2 ? Average photometric redshift for ez≤0.15
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Note (1): Table made of 3 parts:
* The first part of the table lists those candidates (78) which
have six or more member galaxies for the restricted photometric
redshift errors.
* The second part gives those candidates (32) who fall below the limit
of 6 members in the restricted sample.
* The third section gives those candidates (4) who do not have any
member galaxy with a photometric redshift error less than 0.15.
Note (2): The gnomonic positions X and Y refer to the pointing centre of
(J2000) 03:06:12.48-00:20:38.
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History:
From electronic version of A&A.
(End) Patricia Vannier [CDS] 16-Jul-2010