J/MNRAS/477/1760 Antlia galaxies geometric parameters (Calderon+, 2018)
Early-type galaxies in the Antlia cluster: catalogue and isophotal analysis.
Calderon J.P., Bassino L.P., Cellone S.A., Gomez M.
<Mon. Not. R. Astron. Soc., 477, 1760-1771 (2018)>
=2018MNRAS.477.1760C 2018MNRAS.477.1760C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry ; Morphology ; Radial velocities
Keywords: galaxies: clusters: general - galaxies: clusters: individual: Antlia -
galaxies: dwarf - galaxies: elliptical and lenticular, cD -
galaxies: fundamental parameters
Abstract:
We present a statistical isophotal analysis of 138 early-type galaxies
in the Antlia cluster, located at a distance of ∼35Mpc. The
observational material consists of CCD images of four 36x36arcmin2
fields obtained with the MOSAIC II camera at the Blanco 4-m telescope
at Cerro Tololo Interamerican Observatory. Our present work supersedes
previous Antlia studies in the sense that the covered area is four
times larger, the limiting magnitude is MB~-9.6mag, and the surface
photometry parameters of each galaxy are derived from Sersic model
fits extrapolated to infinity. In a companion previous study we
focused on the scaling relations obtained by means of surface
photometry, and now we present the data, on which the previous paper
is based, the parameters of the isophotal fits as well as an isophotal
analysis. For each galaxy, we derive isophotal shape parameters along
the semimajor axis and search for correlations within different radial
bins. Through extensive statistical tests, we also analyse the
behaviour of these values against photometric and global parameters of
the galaxies themselves. While some galaxies do display radial
gradients in their ellipticity (ε) and/or their Fourier
coefficients, differences in mean values between adjacent regions are
not statistically significant. Regarding Fourier coefficients, dwarf
galaxies usually display gradients between all adjacent regions, while
non-dwarfs tend to show this behaviour just between the two outermost
regions. Globally, there is no obvious correlation between Fourier
coefficients and luminosity for the whole magnitude range
(-12≥MV≥-22); however, dwarfs display much higher dispersions at
all radii.
Description:
The photometric data used in this paper are CCD images obtained with
the MOSAIC II camera, mounted on the Victor Blanco 4-m telescope at
the Cerro Tololo Interamerican Observatory (CTIO, Chile). We used the
Kron-Cousins R and Washington C filters.
Our galaxy sample comes from the four MOSAIC-II fields and is composed
of 107 Antlia galaxies considered as 'members' and 31 new galaxies not
catalogued before (Calderon et al., 2015MNRAS.451..791C 2015MNRAS.451..791C) that can be
considered as 'candidates'.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 138 Basic parameters of the Antlia galaxy sample
table1.dat 58 394 Geometric parameters obtained for the galaxies
in the sample
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See also:
VII/180 : Galaxies in Fornax Cluster and five nearby groups (Ferguson+ 1990)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Identifier (G1)
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 27 I2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 37 I2 arcsec DEs Declination (J2000)
39- 49 A11 --- Morph Morphology
51- 55 F5.3 mag E(B-V) Galactic extinction E(B-V) from
Schlafly & Finkbeiner, 2011ApJ...737..103S 2011ApJ...737..103S
57- 60 F4.2 --- n Sersic index
62- 66 F5.2 mag/arcsec+2 mu0 Central surface brightness
68- 72 F5.2 arcsec r0 Scale radius
74- 78 F5.2 mag/arcsec+2 mue Effective surface brightness
80- 85 F6.2 arcsec re Effective radius
87- 91 F5.2 mag T1mag T1-band total magnitude
93- 96 F4.2 mag C-T1 (C-T1) color index
98-101 I4 km/s RV ? Radial velocity
103-105 I3 km/s e_RV ? Radial velocity error
107 A1 --- r_RV [abc] Sources from RV (2)
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Note (2): Sources from RV as follows:
a = Smith Castelli et al., 2012MNRAS.419.2472S 2012MNRAS.419.2472S
b = NED
c = Caso & Richtler, 2015A&A...584A.125C 2015A&A...584A.125C
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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- 18 A18 --- Name Identifier (G1)
20 I1 --- Range [1/5] Radial range
22- 26 F5.3 --- eps ? Mean values of ellipticity for radial range
28- 32 F5.3 --- e_eps ? rms uncertainty on eps
34- 39 F6.3 --- a4/a ? Mean values of a4/a for radial range
41- 45 F5.3 --- e_a4/a ? rms uncertainty on a4/a
47- 52 F6.3 --- a3/a ? Mean values of a3/a for radial range
54- 58 F5.3 --- e_a3/a ? rms uncertainty on a3/a
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Global notes:
Note (G1): ID from Ferguson & Sandage (1990AJ....100....1F 1990AJ....100....1F, Cat. VII/180),
[FS90] Antlia NNN in Simbad, or the acronym "ANTL" followed by the J2000
coordinates (see 2015MNRAS.451..791C 2015MNRAS.451..791C),
[SCF2012] ANTL JHHMMDD.d+DDMMSS.s in Simbad.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Jun-2021