J/AJ/132/347 Redshifts and photometry in Centaurus cluster (Chiboucas+, 2006)
The luminosity function of nearby galaxy clusters.
II. Redshifts and luminosity function for galaxies in the region of the
Centaurus cluster.
Chiboucas K., Mateo M.
<Astron. J., 132, 347-359 (2006)>
=2006AJ....132..347C 2006AJ....132..347C
ADC_Keywords: Clusters, galaxy ; Radial velocities
Keywords: galaxies: clusters: individual (Centaurus A3526) -
galaxies: distances and redshifts - galaxies: dwarf -
galaxies: luminosity function, mass function -
galaxies: stellar content - techniques: spectroscopic
Abstract:
We acquired spectra for a random sample of galaxies within a
0.83deg2 region centered on the core of the Centaurus Cluster.
Radial velocities were obtained for 225 galaxies to limiting
magnitudes of V<19.5. Of the galaxies for which velocities were
obtained, we find 35% to be member galaxies. New redshifts are
obtained for 15 Centaurus Cluster members, many of them dwarf
galaxies. Radial velocities for the other members agree well with
those from previous studies. Of the 78 member galaxies, magnitudes
range over 11.8<V<18.5 (-21.6<MV←14.9 for H0=70km/s/Mpc), with a
limiting central surface brightness of µ0<22.5mag/arcsec2. While
many of these galaxies are giants, about 25 galaxies with MV>-17.0
are considered dwarfs. We constructed the cluster galaxy luminosity
function (LF) by using these spectroscopic results to calculate the
expected fraction of cluster members in each magnitude bin. The
faint-end slope of the LF using this method is shallower than the one
obtained using a statistical method to correct for background galaxy
contamination. We also use the spectroscopy results to define surface
brightness criteria to establish membership for the full sample. Using
these criteria, we find a LF very similar to the one constructed with
the statistical background correction.
Description:
Photometric observations of A3526 (Centaurus: z=0.0114,
12:48:51.8,-41:18:21 [J2000.0]) were acquired with the Las Campanas
Observatory (LCO) 1m telescope with a TEK 2K camera having a field of
view of 20x48 and scale size of 0.6"/pix.
A spectroscopic follow-up was made of 500 of the brightest galaxies in
A3526 using the LCO 2.5m telescope with a multifiber spectrograph and
"2D-FRUTTI" faint object detector.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 61 78 Cluster Members
table3.dat 61 147 Background Galaxies
table4.dat 50 15 New Radial Velocities
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See also:
J/ApJ/591/764 : R magnitudes for 6 nearby galaxy clusters (Christlein+, 2003)
J/ApJS/170/95 : Nearby galaxy clusters Luminosity function I (Chiboucas+, 2007)
Byte-by-byte Description of file: table[234].dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of Right Ascension (J2000)
4- 5 I2 min RAm Minute of Right Ascension (J2000)
7- 11 F5.2 s RAs Second of Right Ascension (J2000)
13 A1 --- DE- Sign of the Declination (J2000)
14- 15 I2 deg DEd Degree of Declination (J2000)
17- 18 I2 arcmin DEm Arcminute of Declination (J2000)
20- 24 F5.2 arcsec DEs Arcsecond of Declination (J2000)
26- 30 F5.2 mag Vmag Total SExtractor V band magnitude (1)
32- 36 I5 km/s RVab ? Radial velocity from absorption lines
37 A1 --- n_RVab [*] Not in Jerjen & Dressler (2)
38- 40 I3 km/s e_RVab ? Error in RVAb
42- 46 I5 km/s RVem ? Radial velocity from emission
47 A1 --- n_RVem [*] Not in Jerjen & Dressler (2)
48- 50 I3 km/s e_RVem ? Error in RVEm
52- 56 I5 km/s RVlit ? Radial velocity from literature
58- 59 I2 km/s e_RVlit ? Error in RVLit
61 I1 --- r_RVlit ? Reference for RVLit (3)
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Note (1): Bertin & Arnouts (1996A&AS..117..393B 1996A&AS..117..393B).
Note (2): In table4, * for galaxies not included in the Centaurus Cluster
Catalog (Jerjen & Dressler, 1997, Cat. J/A+AS/124/1)
Note (3): References as follows:
1 = Stein et al. (1997, Cat. J/A+A/327/952)
2 = Dickens et al. (1986MNRAS.220..679P 1986MNRAS.220..679P)
3 = Mathewson & Ford (1996, Cat. J/ApJS/107/97)
4 = Stein (1996, Cat. J/A+AS/116/203)
5 = Smith et al. (2000, Cat. J/MNRAS/313/469)
6 = Lauberts & Valentijn (1989, Cat. VII/115)
7 = de Vaucouleurs et al. (1991, Cat. VII/155)
8 = Bernardi et al. (2002AJ....123.2990B 2002AJ....123.2990B)
9 = Aguero et al. (1995PASP..107..959A 1995PASP..107..959A)
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Nomenclature note:
Objects are identified as [CM2006] JHHMMSS.ss+DDMMSS.ss in Simbad
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Sep-2007