Access to Astronomical Catalogues

← Click to display the menu
J/AJ/112/36                Velocities in Abell 3266 (Quintana+ 1996)

Dynamics of the cluster of galaxies A3266 (SERSIC 40/6). I. Spectroscopic data Quintana H., Ramirez A., Way M.J. <Astron. J. 112, 36 (1996)> =1996AJ....112...36Q (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radial velocities Abstract: We present 387 velocities covering an area 1.8x1.8°2, including 229 new galaxy velocities obtained from 309 spectra, of which 317 appear to be cluster members according to our analysis. Based on this extended velocity sample we reanalyzed the velocity structure of the cluster. We found a strongly decreasing velocity dispersion profile that, as well as the mean velocity, shows significant radial scatter. Inside the 2.5h50-1Mpc radius, the velocity dispersion has a value of 1306±73km/s, while further out than 3h50-1Mpc it falls below 800km/s. The global dispersion is 1085±51km/s. We found a remarkable velocity substructure, which we interpret as a tidal outgoing arm reaching from the center to the northernmost extensions surveyed. The arm could be produced by a recent merger with another cluster, that moved from the front and SW direction and scattered from the main cluster core into the arm. This model allows us to derive an epoch for the collision between the more massive core and the front edge of the incoming cluster of 4x109h50-1yr ago and of ∼2x109h50-1yr for the merging of both cores. Formation of the dumb-bell is a later merger process of the two BCMs, consistent with theoretical estimates. The collision picture is also consistent with the distorted X-ray image. The very northernmost parts of the arm could, alternatively, be interpreted as ongoing infall of a few outlying loose groups. The suggestion of a faint galaxy system within 400h50-1kpc, satellite to the central dumb-bell, is maintained in spite of the large central velocity dispersion value; however, confirmation requires data for further compact faint members. From several mass estimators we derived a cluster dynamical mass value of 5x1015h50-1M, but this value should be seen in the merger context described. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 68 592 A3266 - Velocities. a3266.dat 60 317 Cluster members (Figures 8-9 of paper)
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 5 I5 --- Id Identification number 7- 8 I2 h RAh Right ascension (1950) 10- 11 I2 min RAm Right ascension (1950) 13- 16 F4.1 s RAs Right ascension (1950) 18 A1 --- DE- Declination sign 19- 20 I2 deg DEd Declination (1950) 22- 23 I2 arcmin DEm Declination (1950) 25- 28 F4.1 arcsec DEs Declination (1950) 30- 34 I5 km/s Vel Velocity 36- 38 I3 km/s e_Vel rms uncertainty on Vel 40- 43 F4.1 Mpc R ? R Tonry and Davis (1979AJ.....84.1511T) value 45 A1 --- Note [*e] emission/uncertainty (1) 47- 51 A5 --- Ref References (2) 53- 57 A5 --- IdRef Fiber or galaxy number in the references (3) 59- 63 I5 km/s VelAdop ? Adopted final velocity 65- 67 I3 km/s e_VelAdop ? rms uncertainty on VelAdop
Note (1): e: presence of emission lines *: Velocities noted as uncertain by TCG90 that presents a great disagreement with our data Note (2): References from this paper: argu = ARGUS spectra fibr = LCO fiber spectra shec = re-measured by Quintana and Ramirez (1990AJ....100.1121Q) References from other papers: C085 = Carter et al. (1985MNRAS.212..471C) G088 = Green et al. (1988MNRAS.234.1051G) M082 = Materne et al. (1982A&A...109..238M) MQ81a = Melnick and Quintana (1981A&AS...44...87M) MQ81b = Melnick and Quintana (1981AJ.....86.1567M) TCG90 = Teague et al. (1990ApJS...72..715T) V075 = Vidal (1975PASP...87..625V) W080 = West and Frandsen (1981A&AS...44..329W) Note (3): A negative value indicates that the velocity was not used in the calculation
Byte-by-byte Description of file: a3266.dat
Bytes Format Units Label Explanations
1- 3 I3 --- No Galaxy Number 5- 9 I5 --- Id Identification number 11- 12 I2 h RAh Right Ascension 1950 (hours) 13- 14 I2 min RAm Right Ascension 1950 (minutes) 15- 18 F4.1 s RAs Right Ascension 1950 (seconds) 19 A1 --- DE- Declination 1950 (sign) 20- 21 I2 deg DEd Declination 1950 (degrees) 22- 23 I2 arcmin DEm Declination 1950 (minutes) 24- 27 F4.1 arcsec DEs Declination 1950 (seconds) 29- 34 F6.3 Mpc X Distance from cluster center, East left 36- 41 F6.3 Mpc Y Distance from cluster center, North 44- 48 F5.3 Mpc R Distance from cluster center 52- 56 I5 km/s Vel Final velocity 58- 60 I3 km/s e_Vel Mean error on Vel
Note (1): Assumed Hubble value Ho=50km/s/Mpc
History: Table 1 was prepared via OCR at CDS, and proofread by Heinz Andernach (). File a3266.dat was kindly supplied by Amelia Ramirez Rivera () to H. Andernach in July 1996.
(End) James Marcout, Patricia Bauer [CDS] 08-Jul-1997
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