J/A+A/432/381 VLT spectroscopic survey of RX J0152.7-1357 (Demarco+, 2005)
A VLT spectroscopic survey of RX J0152.7-1357,
a forming cluster of galaxies at z=0.837.
Demarco R., Rosati P., Lidman C., Homeier N.L., Scannapieco E., Benitez N.,
Mainieri V., Nonino M., Girardi M., Stanford S.A., Tozzi P., Borgani S.,
Silk J., Squires G., Broadhurst T.J.
<Astron. Astrophys. 432, 381 (2005)>
=2005A&A...432..381D 2005A&A...432..381D
ADC_Keywords: Clusters, galaxy ; Surveys ; Redshifts
Keywords: galaxies: clusters: general - techniques: spectroscopic -
X-ray: galaxies: clusters -
galaxies: clusters: individuals: RX J0152.7-1357
Abstract:
We present the results of an extensive spectroscopic survey of
RX J0152.7-1357, one of the most massive distant clusters of galaxies
known. Multi-object spectroscopy, carried out with FORS1 and FORS2 on
the ESO Very Large Telescope (VLT), has allowed us to measure more
than 200 redshifts in the cluster field and to confirm 102 galaxies as
cluster members. The mean redshift of the cluster is z=0.837±0.001
and we estimate the velocity dispersion of the overall cluster galaxy
distribution to be ∼1600km/s.
Description:
Spectroscopic catalogs of cluster members and field galaxies in the
field of RX J0152.7-1357. The spectroscopic data have been obtained
with VLT/FORS under seeing conditions of <0.8". For cluster members,
the following information is given: equatorial coordinates (J2000),
redshift and error in redshift, emission line flag indicating presence
of emission features in galaxy spectra, most prominent spectral
features and spectroscopic type as defined in Dressler et al. (1999,
Cat. J/ApJS/122/51). For field galaxies only equatorial coordinates
(J2000), redshift and error in redshift are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
members.dat 103 102 Spectroscopic information of cluster members
fields.dat 46 85 Spectroscopic information of field galaxies
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See also:
J/ApJS/122/51 : Spectroscopic cat. of 10 rich galaxy clusters (Dressler+ 1999)
Byte-by-byte Description of file: members.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Galaxy ID number
5 A1 --- m_Seq [b] Multiplicity index on Seq
7- 8 I2 h RAh Right ascension (J2000.0)
10- 11 I2 min RAm Right ascension (J2000.0)
13- 17 F5.2 s RAs Right ascension (J2000.0)
19 A1 --- DE- Declination sign (J2000.0)
20- 21 I2 deg DEd Declination (J2000.0)
23- 24 I2 arcmin DEm Declination (J2000.0)
26- 29 F4.1 arcsec DEs Declination (J2000.0)
31- 36 F6.4 --- z Galaxy redshift
38- 43 F6.4 --- e_z Error in redshift
45 I1 --- Em [0,2] Emission line flag
47- 92 A46 --- SpecFeat Detected Spectral Features
95-104 A10 --- SpClass Spectral Classification (1)
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Note (1): Spectral classification following Dressler et al. (1999,
Cat. J/ApJS/122/51) classification:
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Class [OII]3727 EW Hδ Comments
(Å)
-----------------------------------------------------------------------------
k Absent < 3 Passive
k+a Absent 3-8 Moderate Balmer absorption without emission
a+k Absent ≥8 Strong Balmer absorption without emission
e(c) Yes, <40 < 4 Moderate Balmer absorption plus emission,
spiral-like
e(a) Yes ≥4 Strong Balmer absorption plus emission
e(b) ≥40 Starburst
e(n) AGN from broad lines or [O III] 5007/Hβ ratio
e Yes ? With at least one emission line but S/N too low
to classify
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Byte-by-byte Description of file: fields.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Galaxy ID number
7- 8 I2 h RAh Right Ascension J2000 (hours)
10- 11 I2 min RAm Right Ascension J2000 (minutes)
13- 17 F5.2 s RAs Right Ascension J2000 (seconds)
20 A1 --- DE- Declination J2000 (sign)
21- 22 I2 deg DEd Declination J2000 (degrees)
24- 25 I2 arcmin DEm Declination J2000 (minutes)
27- 30 F4.1 arcsec DEs Declination J2000 (seconds)
33- 38 F6.4 --- z Galaxy redshift
41- 46 F6.4 --- e_z Error in redshift
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Acknowledgements: Ricardo Demarco, demarco(at)pha.jhu.edu
(End) Patricia Vannier [CDS] 25-Nov-2004