J/A+A/407/31 Heliocentric radial velocities in Abell 376 (Proust+, 2003)
The cluster of galaxies Abell 376.
Proust D., Capelato H.V., Hickel G., Sodre Jr. L., Lima Neto G.B.,
Cuevas H.
<Astron. Astrophys. 407, 31 (2003)>
=2003A&A...407...31P 2003A&A...407...31P
ADC_Keywords: Clusters, galaxy ; Radial velocities
Keywords: galaxies: distances and redshifts - galaxies: cluster: general -
galaxies: clusters: individual: Abell 376 - X-rays: galaxies: clusters
Abstract:
We present a dynamical analysis of the galaxy cluster Abell 376 based
on a set of 73 velocities, most of them measured at Pic du Midi and
Haute-Provence observatories and completed with data from the
literature. Data on individual galaxies are presented and the accuracy
of the determined velocities is discussed as well as some properties
of the cluster. We obtained an improved mean redshift value
z=0.0478^+0.005-0.006 and velocity dispersion
σ=852+120-76km/s.
Our analysis indicates that inside a radius of ∼900h70-1kpc
(∼15-arcmin) the cluster is well relaxed without any remarkable
feature and the X-ray emission traces fairly well the galaxy
distribution. A possible substructure is seen at 20-arcmin from the
centre towards the Southwest direction, but is not confirmed by the
velocity field. This SW clump is, however, kinematically bound to the
main structure of Abell 376. A dense condensation of galaxies is
detected at 46 arcmin (projected distance 2.6h70-1Mpc) from the
centre towards the Northwest and analysis of the apparent luminosity
distribution of its galaxies suggests that this clump is part of the
large scale structure of Abell 376. X-ray spectroscopic analysis of
ASCA data resulted in a temperature kT=4.3±0.4keV and metal
abundance Z=0.32±0.08Z_☉. The velocity dispersion corresponding
to this temperature using the TX-σ scaling relation is in
agreement with the measured galaxies velocities.
Description:
A total of 71 velocities has been obtained from our observations.
Table 1 lists positions and heliocentric velocities for 73 individual
galaxies in the cluster including data from
Wegner et al. (1999, Cat. J/MNRAS/305/259) and from
Postman and Lauer (1995, Cat. J/ApJ/440/28).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 71 78 Heliocentric radial velocities in Abell 376
--------------------------------------------------------------------------------
See also:
VII/174 : Morphological type catalog in 55 rich galaxy clusters
(Dressler, 1980)
J/MNRAS/305/259 : EFAR galaxies redshifts + velocity disp. (Wegner+, 1999)
J/ApJ/440/28 : Brightest Cluster Galaxies velocities (Postman+ 1995)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Dressler (1980, Cat. VII/174) number
([D80] ACO 376 NNN in Simbad)
6- 17 A12 --- Name Alternative name LEDA, UGC, GIN or MCG
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 28 F4.1 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 39 I2 arcsec DEs Declination (J2000)
42- 46 A5 --- MType Morphological type from Dressler's (1980,
Cat. VII/174) catalogue
50- 54 I5 km/s HRV ? Heliocentric radial velocity
56- 58 I3 km/s e_HRV ? rms uncertainty on HRV
61- 65 F5.2 --- R ? R cross-correlation parameter derived from
Tonry & Davis (1979AJ.....84.1511T 1979AJ.....84.1511T) (3)
68- 69 A2 --- Tel Telescope or origin (1)
70 I1 --- Notes [1/4]? Individual notes (2)
--------------------------------------------------------------------------------
Note (1): Telescopes:
o: 1.93m OHP telescope + CARELEC spectrograph
p: 2.0m Pic du Midi telescope + ISARD
l1: from Wegner et al. (1999, Cat. J/MNRAS/305/259)
l2: from Postman and Lauer (1995, Cat. J/ApJ/440/28)
Note (2): Notes:
1: emission line: OII= 39998 km/s
2: aligned star with a foreground galaxy (V < 10000 km/s)
3: dominant M star
4: dominant star
Note (3): R = h/(sqrt(2)*σCCF), where
h is the height of the cross-correlation peak and
σCCF is the rms noise in the cross-correlation.
--------------------------------------------------------------------------------
Acknowledgements: Dominique Proust
(End) Patricia Bauer [CDS] 27-Jun-2003