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J/A+A/399/813   Multiple merging events in Abell 521    (Ferrari, 2003)

Multiple merging events in Abell 521 Ferrari C., Maurogordato S., Cappi A., Benoist C. <Astron. Astrophys. 399, 813 (2003)> =2003A&A...399..813F
ADC_Keywords: Clusters, galaxy ; Galaxies, spectra; Redshifts Keywords: galaxies: clusters: general ; galaxies: clusters: individual: Abell 521 ; galaxies: distances and redshifts ; cosmology: observations Keywords:galaxies: clusters: general - galaxies: clusters: individual (Abell 521) - galaxies: distances and redshifts - cosmology: observations Abstract: We present a detailed spatial and dynamical analysis of the central ∼2.2Mpc(Ho=75km/s/Mpc) region of the galaxy cluster Abell 521 (z=0.247), based on 238 spectra (of which 191 new measurements) obtained at the 3.6m Telescope of the European Southern Observatory and at the Canada-France-Hawaii Telescope. From the analysis of the 125 galaxies that are confirmed members of the cluster, we derive a location ("mean" velocity) of CBI=74019{+112}{-125}km/s and detect a complex velocity distribution with high velocity scale ("dispersion", SBI=1325{+145}{-100}km/s), but clear departure from a single Gaussian component. When excluding a possible background group of four galaxies, the velocity dispersion remains still large (∼1200 km/s). Description: Radial velocity measurements and spectral features of 191 objects in the central region of the galaxy cluster Abell 521, observed through a campaign of multi-object spectroscopy at the ESO 3.6m telescope (3 nights in October 1999, and 2.5 nights in December 2000). The spectral resolution is 1.85nm in October 1999 and 1.25nm in December 2000 (FWHM) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table10.dat 64 191 Radial velocities and spectral lines for 191 galaxies in A521
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Id Identification number 5- 8 A4 --- Run Run of observations 10- 11 I2 h RAh Right ascension (J2000.0) 13- 14 I2 min RAm Right ascension (J2000.0) 16- 20 F5.2 s RAs Right ascension (J2000.0) 22 A1 --- DE- Declination sign (J2000.0) 23- 24 I2 deg DEd Declination (J2000.0) 26- 27 I2 arcmin DEm Declination (J2000.0) 29- 33 F5.2 arcsec DEs Declination (J2000.0) 35- 40 I6 km/s cz [-2,]?=-1 Radial velocity (2) 42- 44 I3 km/s e_cz [-2,]?=-1 Error on radial velocity (2) 46 I1 --- q_cz Quality flag for the redshift determination (1) 48- 64 A17 --- Em.Lines Emission lines present in the spectrum
Note (1): We have classified the quality of the spectra in the following way: 1 = good determination (R≥3), 2 = uncertain determination, 3 = very poor determination, 4 = failed spectra Note (2): The negative values mean: -1 = the galaxy velocity could not be determined -2 = object is a star
Author's address: Chiara Ferrari
(End) Chiara Ferrari [OCA, France] 26-Feb-2003
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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