Annu. Rev. Astron. Astrophys. 1994. 32: 115-52
Copyright © 1994 by . All rights reserved

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Summary of Results

Given the available data, we are able to calculate the following properties: linear radius Rlin, blue luminosity LB, far infrared luminosity LFIR, total mass MT, neutral hydrogen mass MHI, the ratios MT / LB, MHI / LB and MHI / MT, the blue surface magnitude SigmaB, and the surface densities SigmaT, sigmaHI, and sigmaFIR. Figures 2-4 summarize our examination of morphological dependence in the fundamental properties for both the RC3-UGC (circles) and RC3-LSc (squares) samples as described above. In each panel, the median (filled symbol) and mean (open symbol) values for each morphological class are plotted along with an indication of the interquartile range (vertical bar extending from the values at the 25th and 75th percentiles). Although in most cases the median and mean values are not significantly different, many of the distributions are significantly non-gaussian and sufficiently broad and skewed that the mean value is not a useful indicator. In settling on this presentation, we have also examined histograms of each distribution. Note that, although a logarithmic scale is used in the display, all quantities have been calculated using linear variables where logarithms are not already involved (e.g. B-V). Where necessary, survival analysis has been applied in the calculation of mean values but it should be noted that medians and percentiles treat non-detections as detections. Median and quartile values, along with the number of galaxies in each subsample, are also presented in Table 1. Since we note that for many properties there is little variation over adjacent types, pairs of morphological classes are combined in producing the table in order to shorten the presentation.

It is convenient to adopt Binggeli's (1993) nomenclature for giant ``classical'' and dwarf systems. He refers to spirals of type Sa, Sb, and some Sc's as ``classical spirals'' with the term ``dwarf irregulars'' applying to types Sd, Sm, and Im as well as late Sc's. This is not only useful for descriptive purposes but, as evident in the figures and Table 1, marks an important dividing line in certain of the global properties of galaxies.

In the next sections, we will use these graphical and tabular summaries in the discussion of the properties of the normal galaxy population.

Table 1. Statistical properties of the morphological classes

Sample E, S0 S0a,Sa Sab,Sb Sbc,Sc Scd,Sd Sm,Im

Rlin
(kpc)
UGC median
25%
75%
Number
21.1
14.0
28.8
1363
19.8
13.9
26.5
798
25.1
18.4
32.1
1488
22.4
16.4
29.8
1139
17.7
11.8
24.0
2223
8.5
4.9
14.0
919
LSc median
25%
75%
Number
9.0
5.8
13.2
705
9.8
6.9
13.6
342
12.0
8.3
16.7
454
13.2
9.5
17.7
616
9.3
6.8
12.2
1037
6.0
4.1
8.3
958
 
LB
(109 Lsmsun)
UGC median
25%
75%
Number
52.5
21.4
93.3
1302
43.6
21.4
79.4
761
69.2
38.0
107.2
1391
52.5
29.5
95.5
1029
25.7
9.8
53.7
1527
2.7
1.0
7.1
416
LSc median
25%
75%
Number
11.0
4.2
24.0
665
13.2
5.4
23.4
315
19.5
8.1
38.0
407
21.9
9.3
41.7
563
6.8
3.2
13.2
834
1.9
0.8
4.1
595
 
MT
(1010 Msmsun)
UGC median
25%
75%
Number
22.6
8.7
49.0
292
32.4
17.0
52.5
808
19.0
9.5
33.9
639
7.9
3.5
16.6
1471
1.6
0.5
4.0
490
LSc median
25%
75%
Number
7.1
3.2
17.4
119
11.0
4.9
21.4
251
9.1
5.1
16.2
389
2.8
1.4
5.1
701
1.0
0.4
1.8
534
 
MT/LB
(Msmsun/Lsmsun)
UGC median
25%
75%
Number
4.9
3.1
7.2
278
4.4
3.2
6.0
749
3.8
2.9
5.4
567
3.5
2.6
5.0
1025
4.2
2.6
6.8
245
LSc median
25%
75%
Number
5.1
3.1
8.8
112
5.0
3.4
6.9
238
4.2
3.2
6.0
362
4.1
3.0
6.0
574
5.0
3.1
7.9
342
 
SigmaB UGC median
25%
75%
Number
14.20
13.82
14.62
1591
13.98
13.47
14.39
977
13.96
13.44
14.41
1694
14.00
13.44
14.48
1154
14.02
13.29
14.63
1663
14.59
14.08
15.23
457
LSc median
25%
75%
Number
13.78
13.51
14.15
682
13.73
13.36
14.10
317
13.55
13.10
13.99
412
13.72
13.23
14.22
571
14.02
13.39
14.65
858
14.73
14.21
15.35
649
 
sigmaT
(Msmsun pc-2)
UGC median
25%
75%
Number
188.9
133.4
249.8
292
154.7
115.2
199.9
808
124.2
94.5
167.6
639
91.4
67.8
119.6
1471
74.5
49.2
113.2
490
LSc median
25%
75%
Number
200.8
121.7
323.1
119
178.2
125.4
242.8
251
148.5
108.1
194.2
389
95.8
69.6
131.8
701
81.4
52.1
120.0
534
 
sigmaHI
(Msmsun pc-2)
UGC median
25%
75%
Number
Detect
1.31
0.33
4.93
403
217
4.64
2.12
9.12
535
450
7.70
4.62
11.39
1200
1149
9.83
6.92
14.00
1053
1031
9.80
6.93
13.82
2106
2071
10.85
6.86
16.71
902
894
LSc median
25%
75%
Number
Detect
1.40
0.26
5.81
288
146
4.45
1.25
11.11
212
178
7.95
4.48
13.86
349
340
10.84
7.20
16.36
561
557
10.82
7.39
16.04
967
963
12.09
7.51
19.23
906
901
 
sigmaFIR
(Lsmsun pc-2)
UGC median
25%
75%
Number
Detect
3.77
1.00
13.15
256
127
11.47
3.32
28.45
271
205
9.22
4.23
18.85
684
549
6.73
3.21
14.14
698
517
3.63
1.84
8.07
887
439
7.44
3.07
22.88
90
73
LSc median
25%
75%
Number
Detect
1.41
0.51
4.64
151
58
5.98
1.78
20.21
108
83
7.44
3.06
16.02
167
145
7.54
3.04
18.48
211
191
2.49
1.03
5.83
283
172
4.93
2.26
17.33
60
48
 
MHI
(109 Msmsun)
UGC median
25%
75%
Number
Detect
1.24
0.23
5.01
410
222
5.62
1.78
13.49
537
452
15.14
6.92
26.30
1204
1153
15.85
7.94
26.30
1058
1036
9.33
4.07
17.78
2121
2086
2.40
0.74
6.17
942
934
LSc median
25%
75%
Number
Detect
0.52
0.10
1.58
295
153
1.41
0.42
4.36
213
179
4.17
1.67
8.71
354
345
5.89
3.02
12.59
567
563
3.02
1.41
5.76
987
983
1.27
0.43
2.69
974
969
 
MHI/LB
(Msmsun/Lsmsun)
UGC median
25%
75%
Number
Detect
0.04
0.01
0.12
394
207
0.12
0.04
0.24
510
425
0.21
0.12
0.33
1126
1075
0.29
0.19
0.43
955
934
0.36
0.24
0.56
1444
1424
0.66
0.36
1.10
406
399
LSc 0.03
0.01
0.14
283
141
0.10
0.03
0.28
201
167
0.20
0.11
0.34
325
316
0.30
0.18
0.48
513
509
0.47
0.28
0.76
780
776
0.78
0.44
1.32
555
551
 
MHI/MT UGC median
25%
75%
Number
0.03
0.02
0.06
292
0.05
0.03
0.09
808
0.08
0.05
0.12
639
0.11
0.08
0.15
1471
0.15
0.09
0.23
490
LSc median
25%
75%
Number
0.03
0.10
0.07
119
0.04
0.02
0.08
251
0.07
0.04
0.11
389
0.11
0.07
0.16
700
0.15
0.09
0.24
534
 
LFIR
(109 Lsmsun)
UGC median
25%
75%
Number
Detect
1.71
0.33
12.07
263
131
9.89
2.41
25.40
272
205
14.26
5.78
30.15
688
553
9.87
4.35
21.92
701
519
4.05
1.53
9.72
893
442
1.63
0.27
10.63
95
78
LSc median
25%
75%
Number
Detect
0.40
0.15
0.90
155
59
1.96
0.75
3.98
108
83
3.74
1.27
7.88
171
149
4.84
1.51
11.52
214
193
0.78
0.34
2.16
289
175
0.55
0.17
1.83
69
53
 
(B - V) UGC median
25%
75%
Number
0.90
0.86
0.94
484
0.78
0.66
0.83
161
0.64
0.55
0.73
243
0.55
0.47
0.62
320
0.48
0.42
0.57
161
0.42
0.35
0.53
168
LSc median
25%
75%
Number
0.89
0.84
0.92
421
0.78
0.65
0.84
156
0.62
0.55
0.71
182
0.52
0.44
0.59
282
0.48
0.42
0.56
180
0.42
0.35
0.51
210

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