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J/MNRAS/460/2193    A3407 + A3408 radial velocities          (Nascimento+, 2016)

Dynamical analysis of the cluster pair: A3407 + A3408. Nascimento R.S., Ribeiro A.L.B., Trevisan M., Carrasco E.R., Plana H., Dupke R. <Mon. Not. R. Astron. Soc., 460, 2193-2206 (2016)> =2016MNRAS.460.2193N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radial velocities Keywords: galaxies: clusters: general - galaxies: clusters: intracluster medium - galaxies: evolution - galaxies: statistics Abstract: We carried out a dynamical study of the galaxy cluster pair A3407 and A3408 based on a spectroscopic survey obtained with the 4 metre Blanco telescope at the Cerro Tololo Interamerican Observatory, plus 6dF data, and ROSAT All-Sky Survey. The sample consists of 122 member galaxies brighter than mR=20. Our main goal is to probe the galaxy dynamics in this field and verify if the sample constitutes a single galaxy system or corresponds to an ongoing merging process. Statistical tests were applied to clusters members showing that both the composite system A3407 + A3408 as well as each individual cluster have Gaussian velocity distribution. A velocity gradient of ∼847±114km/s was identified around the principal axis of the projected distribution of galaxies, indicating that the global field may be rotating. Applying the kmm algorithm to the distribution of galaxies, we found that the solution with two clusters is better than the single unit solution at the 99 per cent cl. This is consistent with the X-ray distribution around this field, which shows no common X-ray halo involving A3407 and A3408. We also estimated virial masses and applied a two-body model to probe the dynamics of the pair. The more likely scenario is that in which the pair is gravitationally bound and probably experiences a collapse phase, with the cluster cores crossing in less than ∼1h-1Gyr, a pre-merger scenario. The complex X-ray morphology, the gas temperature, and some signs of galaxy evolution in A3408 suggest a post-merger scenario, with cores having crossed each other ∼1.65h-1Gyr ago, as an alternative solution. Description: All images and spectroscopic data of Abell 3407 and Abell 3408 were collected with the 4 metre Victor Blanco telescope at the Cerro Tololo Interamerican Observatory (CTIO), in Chile. The clusters were imaged through the B, V and R Johnson-Cousins filters with the Mosaic II CCD imager during the nights of 2007 February 14 and 15. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 84 67 Abell 3407 tablea2.dat 84 38 Abell 3408
Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1 I1 h RAh Right ascension (J2000) 3- 4 I2 min RAm Right ascension (J2000) 6- 10 F5.2 s RAs Right ascension (J2000) 12 A1 --- DE- Declination sign (J2000) 13- 14 I2 deg DEd Declination (J2000) 16- 17 I2 arcmin DEm Declination (J2000) 19- 22 F4.1 arcsec DEs Declination (J2000) 24- 28 F5.2 mag Rmag Cousins R magnitude 30- 34 I5 km/s RV Radial velocity 36- 38 I3 km/s e_RV rms uncertainty on RV 40- 44 F5.2 --- R R parameter (Tonry & Davis, 1979AJ.....84.1511T) 46- 84 A39 --- EmLines Emission lines
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Oct-2017
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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