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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 68 592 A3266 - Velocities.
a3266.dat 60 317 Cluster members (Figures 8-9 of paper)
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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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 --- TDR ? R Tonry and Davis (1979AJ.....84.1511T 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
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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 1990AJ....100.1121Q)
References from other papers:
C085 = Carter et al. (1985MNRAS.212..471C 1985MNRAS.212..471C)
G088 = Green et al. (1988MNRAS.234.1051G 1988MNRAS.234.1051G)
M082 = Materne et al. (1982A&A...109..238M 1982A&A...109..238M)
MQ81a = Melnick and Quintana (1981A&AS...44...87M 1981A&AS...44...87M)
MQ81b = Melnick and Quintana (1981AJ.....86.1567M 1981AJ.....86.1567M)
TCG90 = Teague et al. (1990ApJS...72..715T 1990ApJS...72..715T)
V075 = Vidal (1975PASP...87..625V 1975PASP...87..625V)
W080 = West and Frandsen (1981A&AS...44..329W 1981A&AS...44..329W)
Note (3): A negative value indicates that the velocity
was not used in the calculation
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Byte-by-byte Description of file: a3266.dat
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Bytes Format Units Label Explanations
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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 (1)
52- 56 I5 km/s Vel Final velocity
58- 60 I3 km/s e_Vel Mean error on Vel
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Note (1): Assumed Hubble value Ho=50km/s/Mpc
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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