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

Next Contents Previous

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

Next Contents Previous