J/A+A/507/671 Spectroscopy in cluster RDCS J1252.9-2927 (z=1.2) (Tanaka+, 2009)
Star formation activities of galaxies in the large-scale structures at z=1.2.
Tanaka M., Lidman C., Bower R.G., Demarco R., Finoguenov A., Kodama T.,
Nakata F., Rosati P.
<Astron. Astrophys., 507, 671-682 (2009)>
=2009A&A...507..671T 2009A&A...507..671T
ADC_Keywords: Clusters, galaxy ; Redshifts ; Galaxies, photometry
Keywords: galaxies: evolution - galaxies: clusters: individual: RDCS J1252-29 -
cosmology: large-scale structure of Universe
Abstract:
Recent wide-field imaging observations of the X-ray luminous cluster
RDCS J1252.9-2927 at z=1.24 uncovered several galaxy groups that
appear to be embedded in filamentary structure extending from the
cluster core. We make a spectroscopic study of the galaxies in these
groups using GMOS on Gemini-South and FORS2 on VLT with the aim of
determining if these galaxies are physically associated to the
cluster. We find that three groups contain galaxies at the cluster
redshift and that they are probably bound to the cluster. This is the
first confirmation of filamentary structure as traced by galaxy groups
at z>1. We then use several spectral features in the FORS2 spectra to
determine the star formation histories of group galaxies.
Description:
The GMOS observations were taken between January and March 2007 and
were obtained with the R400 grating set to 7800Å and 7900Å
to fill the detector gaps, and the G5325 order sorting filter.
The FORS2 observations were taken between April and July 2008 and were
obtained with the 300I grism and the OG590 order sorting filter. This
setting covers the 6000-10000Å wavelength range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 114 126 The GMOS and FORS2 spectroscopic catalog
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Table1 : Field name and exposure times
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Field ID Exposure time
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GMOS-F1 14 x 30 min
GMOS-F2 14 x 30 min
GMOS-F3 6 x 30 min
FORS2-F1 12 x 22 min
FORS2-F2 8 x 22 min
FORS2-F3 2 x 22 min
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Name, GMS-FN-NNA or FORS2-FN-NNA
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 24 F5.2 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 36 F4.1 arcsec DEs Declination (J2000)
38- 43 F6.4 --- z Redshift
45- 50 F6.4 --- E_z Error on Redshift (upper limit) (1)
52- 57 F6.4 --- e_z Error on Redshift (lower limit) (1)
59 I1 --- q_z [0/1] 0=secure redshift, 1=possible redshift
61- 65 F5.2 mag Vmag ?=- Total V magnitude (on AB system) (3)
67- 70 F4.2 mag e_Vmag ?=- rms uncertainty on Vmag
72- 76 F5.2 mag Rmag ?=- Total R magnitude (on AB system) (3)
78- 81 F4.2 mag e_Rmag ?=- rms uncertainty on Rmag
83- 87 F5.2 mag imag ?=- Total i magnitude (on AB system) (3)
89- 92 F4.2 mag e_imag ?=- rms uncertainty on imag
94- 98 F5.2 mag zmag ?=- Total z magnitude (on AB system) (3)
100-103 F4.2 mag e_zmag ?=- rms uncertainty on zmag
105-109 F5.2 mag Kmag ?=- Total K magnitude (on AB system) (3)
111-114 F4.2 mag e_Kmag ?=- rms uncertainty on Kmag
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Note (1): The redshift error does not include wavelength calibration error
which is typically 0.2Å.
Note (3): The magnitudes of strongly blended objects are set to "---".
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Feb-2010