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. =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 36x36arcmin^2^ 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 M_B_~-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 ({epsilon}) 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>=M_V_>=-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) that can be considered as 'candidates'. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- See also: VII/180 : Galaxies in Fornax Cluster and five nearby groups (Ferguson+ 1990) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 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) -------------------------------------------------------------------------------- Note (2): Sources from RV as follows: a = Smith Castelli et al., 2012MNRAS.419.2472S b = NED c = Caso & Richtler, 2015A&A...584A.125C -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Global notes: Note (G1): ID from Ferguson & Sandage (1990AJ....100....1F, Cat. VII/180), [FS90] Antlia NNN in Simbad, or the acronym "ANTL" followed by the J2000 coordinates (see 2015MNRAS.451..791C), [SCF2012] ANTL JHHMMDD.d+DDMMSS.s in Simbad. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 03-Jun-2021