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J/A+A/479/1    Redshifts and morphology in A3667     (Johnston-Hollitt+, 2008)

The optical morphology of A3667 re-examined. Johnston-Hollitt M., Hunstead R.W., Corbett E. <Astron. Astrophys. 479, 1 (2008)> =2008A&A...479....1J
ADC_Keywords: Clusters, galaxy ; Galaxies, optical ; Spectroscopy ; Redshifts Keywords: galaxies: clusters - galaxies: distances and redshifts - cosmology: large-scale structure of Universe Abstract: The galaxy cluster A3667 was observed using the Two-degree Field (2dF) multifibre spectroscopic system on the Anglo-Australian Telescope in a program designed to examine the velocity structure in the region. Specifically, we sought evidence from the optical data for the putative cluster merger believed to be responsible for the observed radio and X-ray emission. We present 184 new redshifts in the region, of which 143 correspond to member galaxies of A3667. We find the cluster velocity distribution to be well modelled by a single Gaussian in agreement with previous results. In addition, new redshift-selected isodensity plots significantly reduce the prominence of the previously reported subgroup to the north-west of the main cluster. Instead, we find the galaxy distribution to be elongated and well mixed, with a high velocity dispersion and no significant evidence for substructure. These results are consistent with the axis of the proposed merger being close to the plane of the sky. Description: Spectroscopic redshifts for 143 galaxies found in the cluster A3667 and falling in the redshift range 0.044<z<0.068. For each galaxy we give the catalogue ID, Right ascension and Declination in J2000 coordinates, the blue magnitude, the redshift determined by absorption, the redshift determined by emission, the average redshift between absorption and emission features, any previously published spectroscopic redshift value and finally the morphological type determined by the best correlation to the spectral templates listed in Colless et al. (2001MNRAS.328.1039C). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 63 143 Spectroscopic parameters for 143 galaxies in A3667
See also: J/MNRAS/259/233 : Cluster SC2008-57(A3667) (Sodre+ 1992) VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID Source identification number used in paper 5- 6 I2 h RAh Right ascension (J2000.0) 8- 9 I2 min RAm Right ascension (J2000.0) 11- 15 F5.2 s RAs Right ascension (J2000.0) 17 A1 --- DE- Declination sign (J2000.0) 18- 19 I2 deg DEd Declination (J2000.0) 21- 22 I2 arcmin DEm Declination (J2000.0) 24- 27 F4.1 arcsec DEs Declination (J2000.0) 29- 33 F5.2 --- Bmag Blue magnitude 35- 40 F6.4 --- z(abs) ? Redshift determined by absorption features 42- 47 F6.4 --- z(em) ? Redshift determined by emission features 49- 54 F6.4 --- z(ave) ? Average redshift between z(abs) & z(em) 56- 61 F6.4 --- z(lit) ? Previously published redshift 63 I1 --- Type [1,5] Morphological Type: See Note (1)
Note (1): This is the morphological type as determined by the best correlation to the spectral templates listed in Colless et al. (2001MNRAS.328.1039C): 1=E 2=cD 3=Sbc 4=Sc 5=Sm/Ir
Acknowledgements: Melanie Johnston-Hollitt <Melanie.JohnstonHollitt(at)gmail.com>
(End) Melanie Johnston-Hollitt [University of Tasmania] 20-Aug-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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