Access to Astronomical Catalogues

← Click to display the menu
J/A+A/491/379     Velocities of galaxies in Abell 520   (Girardi+, 2008)

Cluster Abell 520: a perspective based on member galaxies. A cluster forming at the crossing of three filaments? Girardi M., Barrena R., Boschin W., Ellingson E. <Astron. Astrophys., 491, 379-395 (2008)> =2008A&A...491..379G
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Radial velocities Keywords: galaxies: clusters: individual: Abell 520 - galaxies: clusters: general - galaxies: distances and redshifts Abstract: The connection of cluster mergers with the presence of extended, diffuse radio sources in galaxy clusters is still debated. An interesting case is the rich, merging cluster Abell 520, containing a radio halo. A recent gravitational analysis has shown in this cluster the presence of a massive dark core suggested to be a possible problem for the current cold dark matter paradigm. We aim to obtain new insights into the internal dynamics of Abell 520 analyzing velocities and positions of member galaxies. Our analysis is based on redshift data for 293 galaxies in the cluster field obtained combining new redshift data for 8 galaxies acquired at the TNG with data obtained by CNOC team and other few data from the literature. We also use new photometric data obtained at the INT telescope. We combine galaxy velocities and positions to select 167 cluster members around z∼0.201. We analyze the cluster structure using the weighted gap analysis, the KMM method, the Dressler-Shectman statistics and the analysis of the velocity dispersion profiles. We compare our results with those from X-ray, radio and gravitational lensing analyses. Description: Multi-object spectroscopic observations of A520 were carried out at the TNG telescope in December 2006. We used DOLORES/MOS with the LR-B Grism 1. As far as photometry is concerned, our observations were carried out with the Wide Field Camera (WFC), mounted at the prime focus of the 2.5m INT telescope (located at Roque de los Muchachos observatory, La Palma, Spain). We observed A520 in January 2008. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 49 293 Velocity catalog of 293 spectroscopically measured galaxies in the field of A520
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [GBB2008] Sequential number 4 A1 --- n_[GBB2008] [*] * for non-cluster galaxies 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 34 F5.2 mag r'mag ?=- r' SDSS magnitude 36- 41 I6 km/s cz Heliocentric radial velocity (cz) 43- 45 I3 km/s e_cz rms uncertainty on cz 47- 49 A3 --- r_cz [CPT+ ] Redshift source (1)
Note (1): Source as follows: C = CNOC, Canadian Network for Observational Cosmology, Carlberg et al. (1996ApJ...462...32C), Yee et al. (1996ApJS..102..269Y) P = Proust et al. (2000A&A...355..443P) T = TNG, this paper
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Jan-2009
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

catalogue service

© UDS/CNRS

Contact