J/A+A/429/101 Stellar populations of CL 0048-2942 (Serote+, 2005)
The intermediate-redshift galaxy cluster CL 0048-2942. Stellar populations.
Serote Roos M., Lobo C., Durret F., Iovino A., Marquez I.
<Astron. Astrophys., 429, 101-114 (2005)>
=2005A&A...429..101S 2005A&A...429..101S
ADC_Keywords: Clusters, galaxy ; Redshifts ; Equivalent widths
Keywords: galaxies: clusters: individual: CL 0048-2942 -
galaxies: clusters: general - galaxies: distances and redshifts -
galaxies: stellar content
Abstract:
We present a detailed study of the cluster CL 0048-2942, located at
z∼0.64, based on a photometric and spectroscopic catalogue of 54
galaxies in a 5x5arcmin2 region centred in that cluster. Of these,
23 galaxies were found to belong to the cluster. Based on this sample,
the line-of-sight velocity dispersion of the cluster is approximately
680±140km/s.
Description:
CL 0048-2942 was identified in optical images of the ESO Imaging
Survey (Nonino et al., 1999A&AS..137...51N 1999A&AS..137...51N) by running a
matched-filter detection algorithm (Lobo et al., 2000A&A...360..896L 2000A&A...360..896L)
on the I-band of that data set.
Images of the cluster field (each one covering square arcmin) were
obtained through the B, V, R and I Bessel-Cousins filters at the La
Silla ESO 3.6m telescope with the EFOSC2 camera. Standard data
reduction was performed with IRAF.
Multi-object spectroscopy was performed during two runs at the VLT: a
first campaign of two nights in September 1999 with the MOS unit of
FORS1 (VLT UT1) provided partial coverage of selected objects in the
cluster candidate field; further data were gathered during the second
campaign, this time in service mode during the first semester of 2000,
with the MOS unit of FORS2 (VLT UT2).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 54 Catalogue for all galaxies with measured redshift
in the field of CL 0048-2942
table4.dat 46 63 The 63 wavelength intervals defined for
measuring the equivalent widths
table56.dat 43 44 Stellar populations for the cluster galaxies and
the field galaxies in terms of the six stellar
components
table8.dat 55 54 Classifications for all 54 galaxies having a
redshift measure
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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- 3 I3 --- [SLD2005] Galaxy sequential number
5- 6 I2 h RAh Right ascension (J2000.0)
8- 9 I2 min RAm Right ascension (J2000.0)
11- 16 F6.3 s RAs Right ascension (J2000.0)
18 A1 --- DE- Declination sign (J2000.0)
19- 20 I2 deg DEd Declination (J2000.0)
22- 23 I2 arcmin DEm Declination (J2000.0)
25- 29 F5.2 arcsec DEs Declination (J2000.0)
31- 36 F6.4 --- zabs ? Absoprtion line redshift
38- 43 F6.4 --- e_zabs ? rms uncertainty on zabs
45- 48 F4.2 --- R ? Tonry & Davis parameter (1979AJ.....84.1511T 1979AJ.....84.1511T)
50- 55 F6.4 --- zem ? Emission line redshift
57- 62 F6.4 --- e_zem ? rms uncertainty on zem
64 I1 --- o_zem ? Number of emission lines used to estimate
the emission line redshift
66- 72 F7.4 mag Icmag ? Cousins I-band aperture magnitude within a
4.5 arcsec aperture
74- 79 F6.4 mag e_Icmag ? rms uncertainty on Icmag
81- 83 A3 --- Flag [bto+ ] Alert flags (1)
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Note (1): Alert flags as follows:
b = blended objects in photometry though position is accurate
in VLT image
o = objects outside the 3.6m f.o.v. or at the image boundary
t = objects with lower signal-to-noise photometry (as can be deduced
from the corresponding magnitude errors) due to the fact that
only one of the several exposures obtained at the 3.6m telescope
covered the region occupied by the object in question; for these
objects, the magnitude obtained is a rough estimate.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 29 A29 --- Lines Line identifications
31- 36 F6.1 0.1nm lambdac Central wavelength
38- 41 I4 0.1nm lambdal Wavelength interval, lower limit
42 A1 --- --- [-]
43- 46 I4 0.1nm lambdau Wavelength interval, upper limit
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Byte-by-byte Description of file: table56.dat
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Bytes Format Units Label Explanations
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1 A1 --- CF [CF] CL0048 (C) or field (F) galaxies
3- 5 I3 --- [SLD2005] Galaxy sequential number
7- 8 A2 --- Pos Relative position flag, for cluster stars (1)
10- 13 F4.2 --- z ? Redshift for star fields
15- 16 I2 % Vyoung ? Main sequence (luminosity class V) young
population contribution (2)
18- 19 I2 % Vint ? Main sequence (luminosity class V)
intermediate population contribution (2)
21- 22 I2 % Vold ? Main sequence (luminosity class V) old
population contribution (2)
24- 25 I2 % IIIyoung ? Giant (luminosity class III) young
population contribution (2)
27- 28 I2 % IIIint ? Giant (luminosity class III) intermediate
population contribution (2)
30- 31 I2 % Iyoung ? Young supergiant (luminosity class I)
population contribution (2)
33- 35 I3 kpc Dist Distance
37- 38 I2 --- Nf Number of features used for each solution found
40- 43 F4.2 mag E(B-V) Reddening
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Note (1): The relative position of each galaxy within the cluster (see Fig. 6)
is indicated as follows:
ct = stands for centre or core
it = denotes the intermediate region
p = identifies peripheral galaxies
Note (2): All values are in percentage and give the contribution of each
population component to the total light at λref=4200Å.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1 A1 --- CF [CF] clusters (C) or field (F) galaxies
3- 5 I3 --- [SLD2005] Galaxy sequential number
7- 10 F4.1 0.1nm EW[OII] ?=- [OII] equivalent width
12- 15 F4.1 0.1nm EWHd ?=- Hδ equivalent width
17- 20 F4.1 0.1nm EWHg ?=- Hγ equivalent width
22- 26 F5.1 0.1nm EWHb ?=- Hβ equivalent width
28- 31 F4.2 0.1nm EW(Hd+Hg)/2 ?=- Hδ+Hγ)/2 equivalent width
34- 36 F3.1 0.1nm EW(Hd+Hg+Hb)/3 ?=- Hδ+Hγ+Hβ)/3
equivalent width
39- 43 A5 --- Class Spectral classification (1)
46- 47 A2 --- Pos Relative position of each cluster galaxy
within the cluster as in Fig. 6 (2)
52- 55 A4 --- MClass Morphological classification attributed by
La Barbera et al.. 2003A&A...399..899L 2003A&A...399..899L (3)
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Note (1): For three of the objects (#396, #399, #908), since the two methods
described do not give the same result, we display both of them.
Note (2): Relative positions code as follows:
ct = centre or core
it = intermediate region
p = peripheral galaxies
Note (3): Morphological classification as follows:
sph = spheroidal galaxies
disks = disk galaxies
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Dec-2005