Annu. Rev. Astron. Astrophys. 1994. 32:
115-52 Copyright © 1994 by Annual Reviews. All rights reserved |
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 B, and the surface densities T, HI, and FIR. 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.
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 L) | 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 M) | 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 (M/L) | 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 | ||
B | 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 | |
T
(M 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 | ||
HI
(M 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 | |
FIR
(L 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 M) | 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 (M/L) | 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 L) | 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 | |