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J/A+A/297/61 E+A galaxies in Cl0939+472 (Belloni+, 1995)
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Detectability and incidence of E+A galaxies in the distant cluster
Cl0939+472 (z=0.41)
Belloni P., Bruzual G.A., Thimm G.J., Roeser H.-J.
<Astron. Astrophys. 297, 61 (1995)>
=1995A&A...297...61B (SIMBAD/NED Reference)
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ADC_Keywords: Clusters, galaxy; Photometry
Keywords: distant clusters - galaxies: evolution - galaxies: photometry
Description:
We present results of a study of E+A galaxies in the cluster Cl0939+472
(z=0.41). We have used a series of narrow-band filters (FWHM~=90-200A)
covering the range from 3800 to 9200A, and broad band B, R, I filters
to obtain low resolution spectra for all galaxies brighter than R=22.5mag
in a 5'x5' cluster field. Two of the narrow-band filters have been chosen
to measure the 4000A-break index, and 3 filters were centered on the
H_{beta}_, H_{gamma}_ and H_{delta}_ lines which are indicators of
recent star formation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 87 35 E+A galaxies in Cl0939+472
table9.dat 44 68 Redshifts and morphological type for all
objects that could be identified in
Dressler A., 1992, STScI Newsletter 9, 2.
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Table 7: Discrimination among morphological types for Cl0939+472 members for
objects with m_R_=<22.5
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Spectral type DG92 This work <B-R> <B-I> <D_4000_>
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Elliptical 22 110 2.40+-0.17 3.55+-0.26 2.21+-0.35
E+A 6 31 2.03+-0.17 3.01+-0.32 1.81+-0.23
Spiral & Im 2 24 1.37+-0.34 2.11+-0.34 1.30+-0.22
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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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2- 4 I3 --- ID Identification number
6- 12 F7.2 arcsec xpos x position (1)
14- 20 F7.2 arcsec ypos y position (1)
22- 26 F5.2 mag Rmag R magnitude
28- 32 F5.3 mag B-R B-R colour
36- 39 F4.2 mag B-I B-I colour
44- 47 F4.2 --- D4000 D4000 index (4000 A-break) (2)
49- 53 F5.3 --- zD []? Redshift for DG
55- 60 F6.4 --- z Redshifth derived from this work
66- 71 F6.4 --- e_z 1-sigma error on z
73- 76 F4.2 Myr Age Galaxy age after the beginning of the second
starburst
81- 87 A7 --- MType(HST) Morphology type derived from
Hubble Space Telescope (HST)
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Note (1): x and y positions relative to the galaxy 259 in DG
Note (2): D4000 = 1.162xF_{lambda}_(5770/120)/F_{lambda}_(5430/130)
where F_{lambda}_(5770/120) is the filter for which the ratio
represent the mean wavelength of filter passband/FWHM of filter
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- ID Identification number
8- 12 F5.3 --- zD []? Redshift derived from DG
16- 20 F5.3 --- z Redshift derived from this work
22- 26 F5.3 --- e_z 1-sigma error on z
28- 32 A5 --- MType(SED) Morphology type derived from
spectral energy distribution (SED)
34- 39 A6 --- MType(HST) Morphology type derived from
Hubble Space Telescope (HST)
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References:
DG : Dressler A. & Gunn J., 1992, ApJS 78, 1
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(End) Patricia Bauer [CDS] 08-Nov-1994