J/A+A/470/505 AMIGA IV. Neighbours around CIG galaxies (Verley+, 2007) ================================================================================ The AMIGA sample of isolated galaxies. IV. A catalogue of neighbours around isolated galaxies. Verley S., Odewahn S. C., Verdes-Montenegro L., Leon S., Combes F., Sulentic J., Bergond G., Espada D., Garcia E., Lisenfeld U., Sabater J. =2007A&A...470..505V ================================================================================ ADC_Keywords: Galaxy catalogs ; Galaxies, optical Keywords: galaxies: general - galaxies: fundamental parameters - galaxies: formation - galaxies: evolution Abstract: Studies of the effects of environment on galaxy properties and evolution require well defined control samples. Such isolated galaxy samples have up to now been small or poorly defined. The AMIGA project (Analysis of the interstellar Medium of Isolated GAlaxies) represents an attempt to define a statistically useful sample of the most isolated galaxies in the local (z<0.05) Universe. A suitable large sample for the AMIGA project already exists, the Catalogue of Isolated Galaxies (CIG, Karachentseva 1973; 1050 galaxies, Cat. VII/82), and we use this sample as a starting point to refine and perform a better quantification of its isolation properties. Digitised POSS-I E images were analysed out to a minimum projected radius R<0.5Mpc around 950 CIG galaxies (those within Vr=1500km/s were excluded). We identified all galaxy candidates in each field brighter than B=17.5 with a high degree of confidence using the LMORPHO software. We generated a catalogue of approximately 54000 potential neighbours (redshifts exist for 30% of this sample). 666 galaxies pass and 284 fail the original CIG isolation criterion. The available redshift data confirm that our catalogue involves a largely background population rather than physically associated neighbours. We find that the exclusion of neighbours within a factor of 4 in size around each CIG galaxy, employed in the original isolation criterion, corresponds to {Delta}Vr~18000km/s indicating that it was a conservative limit. Galaxies in the CIG have been found to show different degrees of isolation. We conclude that a quantitative measure of this is mandatory. It will be the subject of future work based on the catalogue of neighbours obtained here. Description: The AMIGA project aims at Analysing the interstellar Medium of Isolated Galaxies. File "table3.dat" contains the list of 54014 galaxies (950 CIG galaxies + neighbour galaxies), with the coordinates, apparent magnitudes, areas, recession velocities, etc. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 70 54014 Neighbours around CIG galaxies -------------------------------------------------------------------------------- See also: VII/82 : Catalogue of Isolated Galaxies (Karachentseva+ 1986) J/A+A/411/391 : Revised positions for Cat. of Isolated galaxies (Leon+, 2003) J/A+A/436/443 : AMIGA I. Recession velocities (Verdes-Montenegro+, 2005) J/A+A/449/937 : AMIGA II. Morphological refinement (Sulentic+, 2006) J/A+A/462/507 : AMIGA III. IRAS data (Lisenfeld+, 2007) J/A+A/472/121 : AMIGA V. Isolation parameters (Verley+, 2007) J/A+A/485/475 : AMIGA VI. GIG galaxies radio continuum properties (Leon+ 2008) J/A+A/486/73 : AMIGA VII. FIR and radio study (Sabater+, 2008) J/A+A/532/A117 : AMIGA VIII. Flux ratio asymmetry parameter (Espada+, 2011) http://www.amiga.iaa.es : AMIGA HomePage Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- CIG CIG number (K73 NNNN in Simbad), Cat. VII/82 6- 8 I3 --- NName Neighbour number 11- 19 F9.5 deg RAdeg Right ascension (J2000) 21- 29 F9.5 deg DEdeg Declination (J2000) 31- 36 F6.3 [arcsec2] Area Area of the galaxy 38- 43 F6.3 mag Emag Magnitude (SExtractor MAG_ISO) 45- 51 F7.1 arcsec Dist Distance between the neighbour and the CIG 53- 57 F5.1 arcsec D25 Diameter of the galaxy 59 I1 --- Flg1 [0,1] Flag 1 for Karachentseva's criterion (1) 61 I1 --- Flg2 [0,1] Flag 2 for Karachentseva's criterion (1) 63- 68 I6 km/s Vel ?=0 Recession velocity of the galaxy 70 I1 --- Ref Reference for the recession velocity (2) -------------------------------------------------------------------------------- Note (1): Isolation flags are described in section 6.1 of the paper. -- flag1 is "1" if the neighbour is within 20D_i_ -- flag2 is "1" if the neighbour has a diameter similar to the associated CIG galaxy. Note (2): Reference numbers as follows: 0 = no data 1 = SDSS (http://www.sdss.org/) 2 = 2dF (see Cat. VII/226) 3 = CfA (velocity) 4 = NED 5 = HyperLEDA (http://leda.univ-lyon1.fr/) 6 = UZC (Updated Zwicky Catalog, J/PASP/111/438) 7 = CfA2 8 = NOG2 (Nearby Optical Galaxies, Giuricin 2000, J/ApJ/543/178 (table2) -------------------------------------------------------------------------------- Acknowledgements: Simon Verley (arcetri.astro.it) References: Leon et al., Paper I 2003A&A...411..391L, Cat. J/A+A/411/391 Sulentic et al., Paper II 2006A&A...449..937S Cat. J/A+A/449/937 Lisenfeld et al., Paper III 2007A&A...462..507L, Cat. J/A+A/462/507 Verley et al., Paper V 2007A&A...472..121V, Cat. J/A+A/472/121 Leon et al., Paper VI 2008A&A...485..475L, Cat. J/A+A/485/475 Sabater et al., Paper VII 2008A&A...486...73S, Cat. J/A+A/486/73 Espada et al., Paper VIII 2011A&A...532A.117E, Cat. J/A+A/532/A117 Lisenfeld et al., Paper IX 2011A&A...534A.102L, Cat. J/A+A/534/A102 Fernandez Lorenzo et al., Paper X 2012A&A...540A..47F, Cat. J/A+A/540/A47 ================================================================================ (End) Simon Verley [Acretro Observatory] 28-Jul-2007