J/A+A/377/428 Abell 970 galaxies radial velocities (Sodre+, 2001)
The cluster of galaxies Abell 970
Sodre L.Jr., Proust D., Capelato H.V., Lima Neto G.B., Cuevas H.,
Quintana H., Fouque P.
<Astron. Astrophys. 377, 428 (2001)>
=2001A&A...377..428S 2001A&A...377..428S
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Radial velocities
Keywords: galaxies: clusters: general - clusters: individual: A970 -
distances and redshifts - large-scale structure of Universe -
X-ray: general
Abstract:
We present a dynamical analysis of the galaxy cluster Abell 970 based
on a new set of radial velocities measured at ESO, Pic du Midi and
Haute-Provence observatories. Our analysis indicates that this cluster
has a substructure and is out of dynamical equilibrium. This
conclusion is also supported by differences in the positions of the
peaks of the surface density distribution and X-ray emission, as well
as by the evidence of a large-scale velocity gradient in the cluster.
We also found a discrepancy between the masses inferred with the
virial theorem and those inferred with the X-ray emission, which is
expected if the galaxies and the gas inside the cluster are not in
hydrostatic equilibrium. Abell 970 has a modest cooling flow, as is
expected if it is out of equilibrium. We propose that cooling flows
may have an intermittent behaviour, with phases of massive cooling
flows being followed by phases without significant cooling flows after
the accretion of a galaxy group massive enough to disrupt the
dynamical equilibrium in the centre of the clusters. A massive cooling
flow will be established again, after a new equilibrium is achieved.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 69 Heliocentric radial velocities for galaxies
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Gal Galaxy number
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 23 I2 arcsec DEs Declination (J2000)
25- 28 A4 --- MType Morphological type
30- 34 F5.2 mag bmag bj magnitude from the COSMOS/UKST
Southern Sky Object Catalogue
35 A1 --- n_bmag [*] *: estimated magnitude
37- 41 I5 km/s HRV Heliocentric radial velocity
43- 45 I3 km/s e_HRV rms uncertainty on HRV
47- 51 F5.2 --- R Signal-to-noise measure derived from
Tonry & Davis (1979AJ.....84.1511T 1979AJ.....84.1511T)
53 A1 --- Tel [oep] Telescope (1)
54 A1 --- Note Note (2)
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Note (1): Telescopes:
e: 1.52m ESO telescope
o: 1.93m OHP telescope
p: 2.0 m Pic du Midi telescope
Note (2): Notes
1: Emission lines velocity: [OIII], Hα, [SII] = 12084km/s
2: Emission lines velocity: Hα = 22087 km/s
3: Emission lines velocity: Hα = 18858 km/s
4: Emission lines velocity: Hα = 17234 km/s
5: Emission lines velocity: Hα = 17523 km/s
6: Measured on Hβ, [OIII], Hα
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 27-Sep-2001