J/A+A/532/A104 Hubble flow around Fornax cluster of galaxies (Nasonova+, 2011)
Hubble flow around Fornax cluster of galaxies.
Nasonova O.G., de Freitas Pacheco J.A., Karachentsev I.D.
<Astron. Astrophys. 532, A104 (2011)>
=2011A&A...532A.104N 2011A&A...532A.104N
ADC_Keywords: Clusters, galaxy ; Radial velocities
Keywords: galaxies: clusters: individual: Fornax
Abstract:
This work aims to provide a new mass estimate for the Fornax cluster
and the Fornax-Eridanus complex, avoiding methods like the virial or
fits of the X-ray emission profile, which assume that the system is in
equilibrium. This is probably not the case for Fornax, because it is
still in process of formation. Our mass estimate is based on
determination of the zero-velocity surface, which, in the context of
the spherical infall model, permits an evaluation of the total mass
inside such a surface. The zero-velocity surface radius R0 was
estimated either by a running median procedure or by fitting the data
to the velocity field expected from the spherical model, including
effects of the cosmological constant. The velocity field in a region
within 20Mpc of the Fornax center was mapped using a list of 109
galaxies whose distances have an average accuracy of 0.31mag in their
distance modulus. Our analysis indicates that the mass of the Fornax
cluster itself is [0.40-3.32]x1014M☉ inside a radius of
[2.62-5.18]Mpc while the mass inside [3.88-5.60]Mpc, corresponding
to the Fornax-Eridanus complex, is [1.30-3.93]x1014M☉.
Description:
The catalog contains 1140 galaxies with known distances (the average
accuracy in distance moduli is 0.31mag) in wide vicinity (≤30Mpc)
of the Fornax cluster. The data on distances have been obtained from
different methods discussed in the paper and listed in the 'Source'
column of the catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 104 1140 The list of 1140 galaxies in the wide vicinity of
the Fornax cluster (r≤30Mpc)
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See also:
VII/180 : Galaxies in Fornax Cluster & 5 nearby groups (Ferguson+, 1990)
J/A+AS/133/325 : Velocities of 12 Fornax elliptical galaxies (Graham+ 1998)
J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006)
J/ApJ/594/1 : High-z supernovae VRI magnitudes and distances (Tonry+, 2003)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name
13- 14 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
17- 20 F4.1 s RAs [0/60] Right ascension (J2000)
22 A1 --- DE- Declination sign
23- 24 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs [0/60] Declination (J2000)
30- 33 F4.1 Mpc R Distance
35- 37 F3.1 Mpc e_R Distance error
39- 42 F4.1 Mpc RFC Fornax-centric distance
44- 47 I4 km/s VLG Velocity relative to the Local Group
49- 53 I5 km/s VFC1 Fornax-centric velocity in 'minor attractor'
case (1)
55- 60 I6 km/s VFC2 Fornax-centric velocity in 'major attractor'
case (1)
63- 65 I3 deg theta Angular distance to the Fornax-Eridanus
complex barycenter (1)
70- 72 I3 deg lambda Angle between the direction to the Local Group
and to the Fornax-Eridanus complex
barycenter (1)
75- 86 A12 --- Source Method used to estimate distance (2)
88- 89 I2 --- TT ? Morphological T-type
90-104 A15 --- Type Morphological type (when no T-type)
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Note (1): see Sect. 2.1, Fig. 3.
Note (2): methods as follows:
ACSFCS+ = ACS/HST imaging survey by Blakeslee et al. (2009ApJ...694..556B 2009ApJ...694..556B)
SBF = Surface Brightness fLuctuation method (Tonry et al. 2001ApJ...546..681T 2001ApJ...546..681T)
SNIa = Supernovae type Ia (Tonry et al. 2003, Cat. J/ApJ/594/1)
TF (opt) = Tully-Fisher relation calibrated for optical (BVRI) magnitudes
TF (IR) = Tully-Fisher relation calibrated for infra-red magnitudes
TRGB + Ceph = luminosity of the Tip of the Red Giant Branch + Cepheids
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Acknowledgements:
Olga G. Nasonova, phiruzi(at)gmail.com
(End) Patricia Vannier [CDS] 15-Jul-2011