VII/205 Faint Interacting Galaxies (de Mello+ 1997)
A catalog of faint interacting galaxies in pairs and groups
de Mello D.F., Infante L., Menanteau F.
<Astrophys. J. Suppl. Ser. 108, 99 (1997)>
(Erratum vol. 111, p. 467)
=1997ApJS..108...99D 1997ApJS..108...99D
A catalog of faint interacting galaxies in pairs and groups. II.
de Mello D.F., Infante L., Menanteau F., Vieira G.
<Astrophys. J. Suppl. Ser. 110, 227 (1997)>
=1997ApJS..110..227D 1997ApJS..110..227D
ADC_Keywords: Galaxy catalogs
Keywords: catalogs - galaxies: clusters: general - galaxies: evolution -
galaxies: interactions
Abstract:
We have carried out an extensive survey of faint galaxies in order to
examine the rise in the merger rate with redshift and to study the
statistical relations between close interacting galaxies and the field
galaxy population. In paper I (1997ApJS..108...99D 1997ApJS..108...99D), we present the
catalog of faint pairs and groups of galaxies of 46 equatorial fields
taken with the Cerro Tololo Inter-American Observatory 4 m prime
focus. The data set contains 73,988 galaxies, covering a total area of
2.23deg2. We have found 1751 isolated pairs and 30 groups of
galaxies within 19 <Rmag<22 and 2"<θ<6" in this area. Our
results clearly show an increase in pairs and groups of galaxies in
comparison with a randomly generated catalog.
We have completed the second part of an extensive survey of faint
pairs and groups of galaxies in order to study galaxy evolution at
intermediate redshifts. In paper II (1997ApJS..110..227D 1997ApJS..110..227D) we present
the second catalog of faint interacting galaxies of 49 equatorial
fields taken with the Cerro Tololo Inter-American Observatory 4 m
prime focus camera. The data set contains 11,297 galaxies within
19<Rmag<22, covering a total area of 2.63deg2. We have found 1461
isolated pairs and 30 groups with separations 2"<θ<6". Our
results confirm the excess of galaxies in pairs and groups found in
the first catalog (Infante, de Mello, & Menanteau 1996ApJ...469L..85I 1996ApJ...469L..85I;
de Mello, Infante, & Menanteau 1997ApJS..108...99D 1997ApJS..108...99D). The two catalogs
together cover an area of 4.86deg2 in the sky.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 1751 Faint Pairs of Galaxies (Paper I)
table2.dat 202 29 Faint Groups of Galaxies (Paper I)
table3.dat 81 1502 Faint Pairs of Galaxies (Paper II)
table4.dat 242 32 Faint Groups of Galaxies (Paper II)
tables.tex 156 10174 LaTeX version of the tables
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Byte-by-byte Description of file: table1.dat table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RA1h Right ascension (J2000.0) (First galaxy)
4- 5 I2 min RA1m Right ascension (J2000.0) (First galaxy)
7- 11 F5.2 s RA1s Right ascension (J2000.0) (First galaxy)
13 A1 --- DE1- Declination sign (First galaxy)
14- 15 I2 deg DE1d Declination (J2000.0) (First galaxy)
17- 18 I2 arcmin DE1m Declination (J2000.0) (First galaxy)
20- 23 F4.1 arcsec DE1s Declination (J2000.0) (First galaxy)
25- 28 F4.1 mag Rmag1 Total R magnitude (First galaxy)
30- 32 F3.1 arcsec Rgr Pair radius (half distance between components)
34- 37 F4.1 --- Iso [3,60] Group isolation parameter (G1)
39 I1 --- Cl [1,7] Pair classification (G2)
41 A1 --- --- [B]
43- 44 I2 h RA2h Right ascension (J2000.0) (Second galaxy)
46- 47 I2 min RA2m Right ascension (J2000.0) (Second galaxy)
49- 53 F5.2 s RA2s Right ascension (J2000.0) (Second galaxy)
55 A1 --- DE2- Declination sign (Second galaxy)
56- 57 I2 deg DE2d Declination (J2000.0) (Second galaxy)
59- 60 I2 arcmin DE2m Declination (J2000.0) (Second galaxy)
62- 65 F4.1 arcsec DE2s Declination (J2000.0) (Second galaxy)
67- 70 F4.1 mag Rmag2 Total R magnitude (Second galaxy)
72- 74 F3.1 mag --- Pair radius (repetition)
76- 79 F4.1 --- --- Group isolation parameter (repetition) (G1)
81 I1 --- --- [1,7] Classification (repetition) (G2)
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Byte-by-byte Description of file: table2.dat table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RA1h Right ascension J2000 (A component)
4- 5 I2 min RA1m Right ascension J2000 (A component)
7- 11 F5.2 s RA1s Right ascension J2000 (A component)
13 A1 --- DE1- Declination sign J2000 (A component)
14- 15 I2 deg DE1d Declination J2000 (A component)
17- 18 I2 arcmin DE1m Declination J2000 (A component)
20- 23 F4.1 arcsec DE1s Declination J2000 (A component)
25- 28 F4.1 mag Rmag1 Total R magnitude (A component)
30- 32 F3.1 arcsec Rgr Group radius (includes center of all members)
34- 37 F4.1 --- Iso [3,60] Group isolation parameter (G1)
39 I1 --- Cl [1,7] Group classification (G2)
41 A1 --- --- [B]
42- 43 I2 h RA2h Right ascension J2000 (B component)
45- 46 I2 min RA2m Right ascension J2000 (B component)
48- 52 F5.2 s RA2s Right ascension J2000 (B component)
54 A1 --- DE2- Declination sign J2000 (B component)
55- 56 I2 deg DE2d Declination J2000 (B component)
58- 59 I2 arcmin DE2m Declination J2000 (B component)
61- 64 F4.1 arcsec DE2s Declination J2000 (B component)
66- 69 F4.1 mag Rmag2 Total R magnitude (B component)
71- 73 F3.1 arcsec --- Group radius (repetition)
75- 78 F4.1 --- --- Group isolation parameter (repetition) (G1)
80 I1 --- --- [1,7] Group Classification (repetition) (G2)
82 A1 --- --- [C] 85
83- 84 I2 h RA3h Right ascension J2000 (C component)
86- 87 I2 min RA3m Right ascension J2000 (C component)
89- 93 F5.2 s RA3s Right ascension J2000 (C component)
95 A1 --- DE3- Declination sign J2000 (C component)
96- 97 I2 deg DE3d Declination J2000 (C component)
99-100 I2 arcmin DE3m Declination J2000 (C component)
102-105 F4.1 arcsec DE3s Declination J2000 (C component)
107-110 F4.1 mag Rmag3 Total R magnitude (C component)
112-114 F3.1 mag --- Group radius (repetition)
116-119 F4.1 --- --- Group isolation parameter (repetition) (G1)
121 I1 --- --- Group Classification (repetition) (G2)
123 A1 --- --- [D] 126
124-125 I2 h RA4h Right ascension J2000 (D component)
127-128 I2 min RA4m Right ascension J2000 (D component)
130-134 F5.2 s RA4s Right ascension J2000 (D component)
136 A1 --- DE4- Declination sign J2000 (D component)
137-138 I2 deg DE4d Declination J2000 (D component)
140-141 I2 arcmin DE4m Declination J2000 (D component)
143-146 F4.1 arcsec DE4s Declination J2000 (D component)
148-151 F4.1 mag Rmag4 Total R magnitude (D component)
153-155 F3.1 mag --- Group radius (repetition)
157-160 F4.1 --- --- Group isolation parameter (repetition) (G1)
162 I1 --- --- Group Classification (repetition) (G2)
164 A1 --- --- [E] 167
165-166 I2 h RA5h ? Right ascension J2000 (E component)
168-169 I2 min RA5m ? Right ascension J2000 (E component)
171-175 F5.2 s RA5s ? Right ascension J2000 (E component)
177 A1 --- DE5- Declination sign J2000 (E component)
178-179 I2 deg DE5d ? Declination J2000 (E component)
181-182 I2 arcmin DE5m ? Declination J2000 (E component)
184-187 F4.1 arcsec DE5s ? Declination J2000 (E component)
189-192 F4.1 mag Rmag5 ? Total R magnitude (E component)
194-196 F3.1 mag --- ? Group radius (repetition)
198-200 F3.1 --- --- ? Group isolation parameter (repetition) (G1)
202 I1 --- --- ? Group Classification (repetition) (G2)
204 A1 --- --- [F]
205-206 I2 h RA6h ? Right ascension J2000 (F component)
208-209 I2 min RA6m ? Right ascension J2000 (F component)
211-215 F5.2 s RA6s ? Right ascension J2000 (F component)
217 A1 --- DE6- Declination sign J2000 (F component)
218-219 I2 deg DE6d ? Declination J2000 (F component)
221-222 I2 arcmin DE6m ? Declination J2000 (F component)
224-227 F4.1 arcsec DE6s ? Declination J2000 (F component)
229-232 F4.1 mag Rmag6 ? Total R magnitude (F component)
234-236 F3.1 mag --- ? Group radius (repetition)
238-240 F3.1 --- --- ? Group isolation parameter (repetition) (G1)
242 I1 --- --- ? Group Classification (repetition) (G2)
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Global Notes:
Note (G1): The isolation parameter is defined as RN/Rgr (ratio of the
distance to the nearest neighbour to the radius of the group). All
pairs groups were selected such that RN/Rgr>3.
Note (G2): Pair and group classification are defined as:
(Imin and Imax corresponds to members with minimum and maximum
intensity; a 14" box was centered on each pair or group):
1 = members with similar intensity (Imin∼Imax)
and with no object within a 14" box
2 = members with Imin>0.5Imax and with no other object
within a 14" box
3 = members with Imin≤0.5Imax and with no other object
within a 14" box
4 = pairs or groups with a faint object close or with a bright object
on the border of a 14" box
5 = pairs or groups with an object within a 14" box
6 = pairs with a faint member that could be an HII region of a
brighter galaxy.
7 = (not defined in the paper)
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Acknowledgements:
Duilia DeMello <demello(at)stsci.edu>
(End) Francois Ochsenbein [CDS] 24-Sep-1997