Our statistical sample contains 70 galaxies, selected from more than 500 southern spirals
with (B-V)T0 (i.e. the total color indexes corrected
for differential galactic and internal extinction
(to "face-on'') and redshift between B and V bands)
in RC3 according to one single criterion: they have
distinguishable spiral arms.
The mean numerical Hubble stage indexes (T) of these galaixes
are from 2 to 6, and
) less than 0.76.
D25 and d25, taken from RC3,
are the apparent major and minor isophotal diameters measured at or
reduced to the surface brightness level
-m/ss.
It is well known that d25/D25 is usually the approximate value
of
. Following Peng's method, we have adjusted the
value of
around
in order to do
the fitting well, meaning that the inclination of a galaxy
may be derived by well-fitting the spiral arms with a logarithmic
spiral curve on its image. The resulting inclinations
for these galaxies are listed in Table 1 (click here).
The errors of our estimation mainly come from:
a) the position of starting
point for an arm; b) the inclination of a galaxy; c) the
position of the galactic center. The errors from the
position of the starting point and of the center, however, can be decreased
if the grey-scale of an image is modified properly by using
IRAF to obtain the fine structure of a galaxy as deeply as we could have.
The error estimations are derived from the formulae given
by Peng (1988).
PGC | Names | m | T | ![]() |
![]() | ![]() | ![]() | d | ![]() | H/D0 |
![]() | ![]() | (') | (Mpc) | (kpc) | ||||||
PGC 382 | 2 | 5.0 | 54.9 | 5.47![]() | 20.1 | 0.088![]() | 137.55 | 3.60![]() | 0.045 | |
PGC 2052 | NGC 150 | 2 | 3.0 | 66.4 | 17.87![]() | 6.4 | 0.177![]() | 21.08 | 1.08![]() | 0.045 |
PGC 2437 | NGC 210 | 2 | 3.0 | 48.6 | 5.71![]() | 19.3 | 0.314![]() | 22.37 | 2.04![]() | 0.063 |
PGC 2595 | NGC 238 | 2 | 3.1 | 35.6 | 13.81![]() | 8.2 | 0.126![]() | 113.91 | 4.17![]() | 0.063 |
PGC 3089 | NGC 289 | 2 | 4.0 | 50.9 | 7.56![]() | 14.8 | 0.338![]() | 21.48 | 2.11![]() | 0.064 |
PGC 3190 | 4 | 4.2 | 51.9 | 13.43![]() | 16.6 | 0.069![]() | 139.99 | 2.81![]() | 0.053 | |
PGC 5269 | NGC 539 | 2 | 5.0 | 44.7 | 9.46![]() | 11.9 | 0.110![]() | 128.80 | 4.12![]() | 0.069 |
PGC 7379 | NGC 782 | 2 | 3.0 | 29.5 | 9.32![]() | 12.1 | 0.172![]() | 78.33 | 3.92![]() | 0.073 |
PGC 8012 | 2 | 2.6 | 56.5 | 6.54![]() | 17.0 | 0.161![]() | 77.45 | 3.63![]() | 0.102 | |
PGC 8451 | NGC 858 | 2 | 5.0 | 29.4 | 12.91![]() | 8.8 | 0.068![]() | 164.23 | 3.25![]() | 0.054 |
PGC 9420 | NGC 947 | 2 | 5.2 | 58.3 | 16.00![]() | 7.1 | 0.091![]() | 66.31 | 1.75![]() | 0.043 |
PGC 9426 | NGC 945 | 2 | 4.5 | 33.7 | 9.56![]() | 11.8 | 0.188![]() | 59.60 | 3.26![]() | 0.078 |
PGC 9747 | NGC 986 | 2 | 2.0 | 44.7 | 11.96![]() | 9.5 | 0.262![]() | 25.43 | 1.94![]() | 0.067 |
PGC 9973 | 2 | 3.3 | 59.1 | 10.77![]() | 10.5 | 0.094![]() | 115.59 | 3.16![]() | 0.055 | |
PGC 10336 | NGC 1096 | 2 | 4.2 | 17.3 | 10.78![]() | 11.5 | 0.097![]() | 87.16 | 2.50![]() | 0.050 |
PGC 10870 | 2 | 3.8 | 37.4 | 6.84![]() | 16.3 | 0.120![]() | 115.21 | 4.02![]() | 0.085 | |
PGC 11691 | A0305-31 | 2 | 5.9 | 53.9 | 18.15![]() | 6.3 | 0.088![]() | 63.35 | 1.62![]() | 0.036 |
PGC 12412 | NGC 1300 | 2 | 4.0 | 48.6 | 10.69![]() | 10.6 | 0.245![]() | 19.95 | 1.42![]() | 0.039 |
PGC 13179 | NGC 1365 | 2 | 3.0 | 64.7 | 7.77![]() | 14.4 | 0.886![]() | 20.55 | 5.29![]() | 0.079 |
PGC 13586 | NGC 1433 | 2 | 2.0 | 56.4 | 4.80![]() | 22.6 | 0.562![]() | 12.27 | 2.00![]() | 0.087 |
PGC 14704 | IC 2050 | 2 | 3.0 | 37.4 | 15.26![]() | 7.5 | 0.051![]() | 162.65 | 2.41![]() | 0.048 |
PGC 14897 | NGC 1566 | 2 | 4.0 | 37.4 | 8.30![]() | 13.6 | 0.295![]() | 17.60 | 1.51![]() | 0.035 |
PGC 15850 | NGC 1640 | 2 | 3.0 | 39.1 | 8.13![]() | 13.8 | 0.198![]() | 19.71 | 1.13![]() | 0.075 |
PGC 15941 | NGC 1672 | 2 | 3.0 | 38.7 | 8.80![]() | 12.8 | 0.370![]() | 15.40 | 1.66![]() | 0.056 |
PGC 16136 | 2 | 4.5 | 43.1 | 9.33![]() | 12.1 | 0.095![]() | 76.21 | 2.11![]() | 0.070 | |
PGC 16751 | A0504-17 | 2 | 5.0 | 52.9 | 10.56![]() | 10.7 | 0.108![]() | 58.41 | 1.83![]() | 0.071 |
PGC 17436 | NGC 1964 | 2 | 3.0 | 74.7 | 10.05![]() | 11.3 | 0.378![]() | 20.09 | 2.21![]() | 0.066 |
PGC 18092 | IC 2160 | 2 | 4.7 | 66.5 | 11.48![]() | 9.9 | 0.131![]() | 60.49 | 2.30![]() | 0.057 |
PGC 19413 | 2 | 3.0 | 70.7 | 16.54![]() | 6.9 | 0.191![]() | 31.79 | 1.77![]() | 0.065 | |
PGC 19498 | 4 | 5.1 | 60.0 | 21.16![]() | 10.7 | 0.060![]() | 71.25 | 1.24![]() | 0.030 | |
PGC 23616 | NGC 2590 | 2 | 3.5 | 76.1 | 8.93![]() | 12.6 | 0.210![]() | 64.53 | 3.94![]() | 0.092 |
PGC 24395 | NGC 2642 | 2 | 4.0 | 21.1 | 8.51![]() | 13.2 | 0.140![]() | 55.72 | 2.27![]() | 0.067 |
PGC 27351 | NGC 2935 | 2 | 3.0 | 50.1 | 9.07![]() | 12.4 | 0.185![]() | 27.63 | 1.49![]() | 0.050 |
PGC 28027 | NGC 3001 | 3 | 3.9 | 47.5 | 10.43![]() | 16.0 | 0.169![]() | 30.20 | 1.48![]() | 0.052 |
PGC 30108 | NGC 3200 | 2 | 4.5 | 73.0 | 9.29![]() | 12.2 | 0.307![]() | 44.33 | 3.96![]() | 0.070 |
PGC 32026 | NGC 3360 | 4 | 5.0 | 43.6 | 9.88![]() | 22.1 | 0.076![]() | 110.28 | 2.44![]() | 0.063 |
PGC 33919 | 2 | 2.6 | 50.2 | 12.02![]() | 9.4 | 0.128![]() | 33.60 | 1.25![]() | 0.046 | |
PGC 34006 | A1108-09 | 2 | 4.8 | 35.6 | 7.21![]() | 15.5 | 0.142![]() | 101.65 | 4.20![]() | 0.070 |
PGC 42181 | NGC 4575 | 3 | 3.8 | 37.6 | 17.51![]() | 9.7 | 0.073![]() | 67.61 | 1.44![]() | 0.033 |
PGC 45170 | NGC 4939 | 2 | 4.0 | 59.1 | 13.30![]() | 8.6 | 0.144![]() | 40.11 | 1.68![]() | 0.026 |
PGC 45999 | 2 | 2.2 | 74.9 | 8.07![]() | 13.9 | 0.263![]() | 44.59 | 3.41![]() | 0.076 | |
PGC 46974 | NGC 5135 | 2 | 2.0 | 40.9 | 9.56![]() | 11.8 | 0.223![]() | 52.79 | 3.42![]() | 0.087 |
PGC 51456 | NGC 5597 | 2 | 6.0 | 27.4 | 14.83![]() | 7.7 | 0.090![]() | 33.99 | 0.89![]() | 0.039 |
PGC 53499 | NGC 5792 | 2 | 3.0 | 80.5 | 16.26![]() | 7.0 | 0.381![]() | 25.67 | 2.84![]() | 0.054 |
PGC 54250 | NGC 5833 | 2 | 4.2 | 67.2 | 5.75![]() | 19.2 | 0.379![]() | 38.28 | 4.22![]() | 0.109 |
PGC 55738 | NGC 5968 | 2 | 2.0 | 36.1 | 6.24![]() | 17.8 | 0.225![]() | 67.44 | 4.41![]() | 0.096 |
PGC 56630 | IC 4585 | 2 | 3.0 | 72.4 | 32.19![]() | 3.6 | 0.074![]() | 46.64 | 1.00![]() | 0.028 |
PGC 57924 | NGC 6118 | 2 | 6.0 | 69.7 | 12.68![]() | 9.0 | 0.269![]() | 21.63 | 1.69![]() | 0.052 |
PGC 59325 | IC 4618 | 2 | 4.1 | 50.7 | 9.58![]() | 11.8 | 0.128![]() | 38.23 | 1.42![]() | 0.067 |
PGC 60907 | IC 4664 | 2 | 3.2 | 50.9 | 13.85![]() | 8.2 | 0.096![]() | 65.25 | 1.82![]() | 0.048 |
PGC 61315 | NGC 6492 | 2 | 3.8 | 55.0 | 10.62![]() | 10.7 | 0.164![]() | 55.60 | 2.65![]() | 0.062 |
PGC 63204 | IC 4852 | 2 | 4.5 | 31.7 | 6.89![]() | 16.2 | 0.151![]() | 59.64 | 2.62![]() | 0.093 |
PGC 64042 | IC 4933 | 2 | 4.2 | 31.7 | 15.12![]() | 7.5 | 0.121![]() | 64.04 | 2.25![]() | 0.053 |
PGC 64168 | NGC 6862 | 2 | 3.5 | 46.2 | 10.82![]() | 10.5 | 0.136![]() | 55.28 | 2.19![]() | 0.082 |
PGC 64413 | NGC 6872 | 2 | 3.0 | 70.0 | 8.50![]() | 13.2 | 0.484![]() | 62.75 | 8.83![]() | 0.077 |
PGC 65125 | NGC 6937 | 2 | 4.9 | 49.9 | 9.06![]() | 12.5 | 0.185![]() | 61.64 | 3.32![]() | 0.079 |
PGC 67417 | NGC 7125 | 2 | 5.0 | 31.3 | 6.04![]() | 18.3 | 0.077![]() | 39.59 | 0.89![]() | 0.025 |
PGC | Names | m | T | ![]() |
![]() | ![]() | ![]() | d | ![]() | H/D0 |
![]() | ![]() | (') | (Mpc) | (kpc) | ||||||
PGC 67418 | NGC 7126 | 2 | 5.0 | 62.8 | 8.15![]() | 13.8 | 0.224![]() | 39.68 | 2.58![]() | 0.078 |
PGC 67532 | NGC 7141 | 2 | 4.0 | 43.6 | 13.50![]() | 8.4 | 0.210![]() | 38.59 | 2.36![]() | 0.050 |
PGC 69183 | NGC 7309 | 3 | 5.0 | 21.1 | 16.64![]() | 10.2 | 0.083![]() | 54.83 | 1.32![]() | 0.041 |
PGC 69453 | NGC 7329 | 2 | 3.0 | 51.7 | 7.99![]() | 14.1 | 0.298![]() | 40.76 | 3.53![]() | 0.077 |
PGC 69507 | 2 | 5.0 | 30.3 | 16.59![]() | 6.9 | 0.061![]() | 144.28 | 2.56![]() | 0.040 | |
PGC 70027 | NGC 7412 | 2 | 3.0 | 47.9 | 16.37![]() | 7.0 | 0.191![]() | 22.67 | 1.26![]() | 0.049 |
PGC 70096 | NGC 7424 | 2 | 6.0 | 31.7 | 6.59![]() | 16.9 | 0.215![]() | 12.39 | 0.77![]() | 0.023 |
PGC 70800 | NGC 7531 | 2 | 4.0 | 63.5 | 9.30![]() | 12.1 | 0.317![]() | 20.92 | 1.93![]() | 0.069 |
PGC 70884 | NGC 7552 | 2 | 2.0 | 37.4 | 13.83![]() | 8.2 | 0.204![]() | 20.91 | 1.24![]() | 0.059 |
PGC 71001 | NGC 7582 | 2 | 2.0 | 63.0 | 12.86![]() | 8.8 | 0.278![]() | 20.68 | 1.67![]() | 0.055 |
PGC 72444 | NGC 7755 | 2 | 4.7 | 45.7 | 6.45![]() | 17.2 | 0.288![]() | 39.63 | 3.32![]() | 0.076 |
PGC 72718 | 2 | 4.7 | 39.5 | 8.99![]() | 12.5 | 0.113![]() | 102.64 | 3.37![]() | 0.088 | |
PGC 72929 | 2 | 3.7 | 46.2 | 8.40![]() | 13.4 | 0.135![]() | 63.11 | 2.48![]() | 0.102 |