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.
<Astron. Astrophys. 470, 505 (2007)>
=2007A&A...470..505V 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 ΔVr∼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 20Di
-- 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 2003A&A...411..391L, Cat. J/A+A/411/391
Sulentic et al., Paper II 2006A&A...449..937S 2006A&A...449..937S Cat. J/A+A/449/937
Lisenfeld et al., Paper III 2007A&A...462..507L 2007A&A...462..507L, Cat. J/A+A/462/507
Verley et al., Paper V 2007A&A...472..121V 2007A&A...472..121V, Cat. J/A+A/472/121
Leon et al., Paper VI 2008A&A...485..475L 2008A&A...485..475L, Cat. J/A+A/485/475
Sabater et al., Paper VII 2008A&A...486...73S 2008A&A...486...73S, Cat. J/A+A/486/73
Espada et al., Paper VIII 2011A&A...532A.117E 2011A&A...532A.117E, Cat. J/A+A/532/A117
Lisenfeld et al., Paper IX 2011A&A...534A.102L 2011A&A...534A.102L, Cat. J/A+A/534/A102
Fernandez Lorenzo et al., Paper X 2012A&A...540A..47F 2012A&A...540A..47F, Cat. J/A+A/540/A47
(End) Simon Verley [Acretro Observatory] 28-Jul-2007