next previous
Up: Penetrating the "zone

2. Results and discussion

In Fig.1 (click here), the distribution of our galaxy candidates is shown. Even at first glance, there are two obvious characteristics. First, one notices a pronounced preponderance in numbers of galaxies at negative galactic latitudes, from tex2html_wrap_inline995. Second, there appears to be a marked connection across the galactic plane, at tex2html_wrap_inline997 and an extended clump of galaxies at tex2html_wrap_inline999.

 figure210
Figure 1:   Right: distribution of the new galaxies in galactic coordinates. Left: the 60tex2html_wrap_inline1001 flux density taken from the IRAS Sky Survey Atlas; black (white) areas correspond to low (high) flux densities. Both parts of the figure represent the same region.

A cross-check with the distribution of dark nebulae of Lynds (1968) shows that the "holes'' in the distribution (e.g. at tex2html_wrap_inline1003 and tex2html_wrap_inline1005) for the former location partly does, but for the latter one does not coincide with dust clouds. The above-mentioned preponderance might be related to the location of these (mostly nearby) obscuring clouds preferentially above the plane there. Anyway, the asymmetrical distribution in the region tex2html_wrap_inline1007 is probably due to the existence of the galactic warp, evident as the bending of the dust layer (see also Freudenreich et al. 1994). In this context we found that the 60tex2html_wrap_inline1001 (Fig.1 (click here)) or 100tex2html_wrap_inline1001 IRAS sky flux densities that are an approximate measure of the total extinction in front of the galaxies (see Paper II), accord roughly with their distribution. In other words, the distribution appears to reflect the distribution of the galactic dust, and galaxy concentrations are rather holes or transparent locations in the dust layer than real clusters of galaxies. In the region tex2html_wrap_inline1013 the distribution of the galaxies as well as the 60tex2html_wrap_inline1001 IRAS flux densities appear to be symmetrical with respect to the galactic equator. The reason for this can be attributed to the crossing of the dustlayer with the galactic equator.

The excess of galaxies at about tex2html_wrap_inline853 was first noted by Weinberger (1980) who called it a "striking conglomerate of galaxies''. The bridge-like appearance in Fig. 1 (click here), across the galactic plane, however brings to mind the frequently raised question whether or not the main ridge of the Perseus-Pisces supercluster crosses the ZOA and connects to structures in the norther galactic hemisphere including the 3C129 cluster at tex2html_wrap_inline853 and tex2html_wrap_inline1021 (Hauschildt 1987) and cluster Abell569 at tex2html_wrap_inline1023 and tex2html_wrap_inline1025 (Focardi et al. 1984; Chamaraux et al. 1990). According to new and extensive 21 cm measurements this problem appears to be settled: Lu & Freudling (1995) report that it is still possible that 3C129 is connected to the main ridge of the PP supercluster, but a connection to Abell569 can probably be ruled out. For the bridge in Fig.1 (click here) this result consequently is not entirely conclusive: again it calls for further measurements, since Lu & Freudlings's conclusion obviously does not exclude at least a partial crossing, up to tex2html_wrap_inline1027.

In Table 1 (click here) our list of 1067 optical galaxy candidates is presented. The whole compilation is available from the SIMBAD database. The columns have the same meaning as in Paper III. Note that in this table the letters E and O correspond to the POSSI-E (red-sensitive) and POSSI-O (blue-sensitive) prints, respectively. Maximum and minimum diameters were determined and are presented in ar-

cmin. In addition, mean average bulge (b) diameters are given. All diameters listed have an accuracy (of measurement) of tex2html_wrap_inline1029mm, but are presented in hundredths of arcmin to avoid biases that would occur in the course of rounding. A colon means that a galactic nature of the object cannot be excluded. An asterisk was used when more than one optical galaxy fell within the boundaries of one IRAS point source error ellipse.

 

ZOAG tex2html_wrap_inline1035(B1950.0) tex2html_wrap_inline1037(B1950.0) tex2html_wrap_inline1035(J2000.0) tex2html_wrap_inline1037(J2000.0) POSS x(mm) y(mm) tex2html_wrap_inline1043 E tex2html_wrap_inline1045 tex2html_wrap_inline1043 O tex2html_wrap_inline1049 cross id.
G130.00+3.61 01 56 40 +65 17.4 02 00 26 +65 31.9 878 142.9 112.9 0.220.11 0.220.06
G130.00+3.60 01 56 38 +65 16.7 02 00 24 +65 31.2 878 143.1 112.3 0.170.06
G130.02+3.63 : 01 56 56 +65 18.1 02 00 42 +65 32.6 878 141.5 113.6 0.11 0.06
G130.09-3.97 01 42 34 +57 53.4 01 45 55 +58 08.41240 113.7 33.3 0.11 0.22
G130.11-4.34 01 42 10 +57 31.5 01 45 30 +57 46.51240 116.0 13.8 0.220.110.060.11 0.06
G130.24-4.18 01 43 21 +57 39.1 01 46 42 +57 54.11240 107.7 20.8 0.340.22 0.17
G130.29+1.65 01 54 41 +63 19.4 01 58 20 +63 34.0 878 152.1 7.6 0.06 0.06 WEIN171)
G130.46+4.94 02 04 29 +66 26.4 02 08 23 +66 40.6 878 102.9 176.1 0.11
G130.53-4.92 01 44 16 +56 52.3 01 47 36 +57 07.21245 288.3 307.0 0.340.22 0.340.22 CGCG559-02
G130.53-2.17 01 48 53 +59 33.5 01 52 20 +59 48.31240 73.9 124.3 0.220.11 0.220.11
G130.65-4.10 01 46 27 +57 38.9 01 49 49 +57 53.81240 85.5 21.6 0.11 0.11
G130.72-4.19 01 46 50 +57 32.6 01 50 12 +57 47.51240 82.5 16.0 0.11 0.11
G130.76-3.62 01 48 04 +58 05.6 01 51 27 +58 20.41240 75.3 45.8 0.220.17 0.220.17
G130.77-2.84 01 49 32 +58 51.0 01 52 58 +59 05.81240 67.3 86.8 0.220.06 0.110.06
G130.78-2.67 : 01 49 53 +59 00.8 01 53 19 +59 15.61240 65.4 95.6 0.17 0.060.11 0.06
G130.81+4.49 : 02 06 32 +65 54.8 02 10 26 +66 08.9 878 90.1 148.6 0.220.11
G130.86-4.00 01 48 11 +57 41.7 01 51 34 +57 56.51240 73.3 24.7 0.11 0.06
G130.92-4.09 01 48 25 +57 35.8 01 51 48 +57 50.61240 71.3 19.5 0.110.06 0.220.06
G131.04-4.20 : 01 49 09 +57 27.6 01 52 32 +57 42.41240 65.7 12.4 0.11 0.11
G131.13+3.11 02 05 35 +64 30.1 02 09 23 +64 44.3 878 90.5 73.1 0.11 0.11
G131.23-2.27 01 54 05 +59 17.6 01 57 33 +59 32.21240 37.7 112.4 0.670.170.110.22
G131.24-3.49 : 01 51 52 +58 06.0 01 55 17 +58 20.71240 48.5 47.8 0.11 0.06
G131.30-2.27 : 01 54 38 +59 16.2 01 58 07 +59 30.81240 33.9 111.5 0.11
G131.30-3.45 01 52 21 +58 07.8 01 55 46 +58 22.51240 45.2 49.6 0.220.06
G131.32+4.61 02 11 36 +65 52.1 02 15 32 +66 06.0 878 62.3 148.4 0.450.22 0.340.13 IRAS02115+6552
G131.42-4.18 01 51 54 +57 23.4 01 55 18 +57 38.11245 231.6 332.5 0.560.28 0.450.11
G131.48-3.04 01 54 28 +58 28.8 01 57 55 +58 43.41240 31.7 69.3 0.170.11 0.220.11
G131.70-3.20 01 55 46 +58 16.0 01 59 13 +58 30.51240 21.6 58.7 0.110.11
G131.72+3.49 : 02 11 55 +64 40.7 02 15 47 +64 54.6 878 55.0 85.2 0.280.17 0.10
G131.81-4.28 01 54 30 +57 11.6 01 57 54 +57 26.21245 212.8 321.5 0.670.560.340.450.22 5Zw1532)
G131.90-4.33 01 55 04 +57 07.5 01 58 28 +57 22.11245 209.0 317.8 0.170.11 0.220.11
G131.91-4.09 01 55 36 +57 21.5 01 59 01 +57 36.11245 204.9 330.3 0.170.06 0.110.06
G131.92-4.22 01 55 24 +57 13.7 01 58 49 +57 28.31245 206.5 323.4 0.11 0.09
G131.92-3.09 01 57 34 +58 19.1 02 01 02 +58 33.61240 9.3 62.4 0.17 0.060.11
G131.96-2.23 01 59 38 +59 08.2 02 03 08 +59 22.6 597 307.4 110.4 0.11
G132.00+1.86 02 09 42 +63 02.8 02 13 27 +63 16.8 597 230.8 315.4 0.220.11
G132.01-4.18 01 56 08 +57 14.6 01 59 33 +57 29.11245 201.2 324.1 0.17 0.110.03
G132.13-4.65 01 56 05 +56 45.6 01 59 29 +57 00.11245 201.8 298.1 0.11 0.11
G132.14-4.75 01 55 58 +56 39.9 01 59 22 +56 54.41245 202.7 293.1 0.220.11 0.09
G132.18-3.99 01 57 41 +57 23.2 02 01 07 +57 37.71245 189.9 331.6 0.11
G132.19+3.50 02 16 02 +64 32.3 02 19 56 +64 46.11241 333.6 79.6 0.22
G132.31-5.00 01 56 39 +56 22.8 02 00 03 +56 37.31245 197.8 277.8 0.11 0.22
G132.37+3.93 02 18 59 +64 53.2 02 22 55 +65 06.81241 314.7 96.3 0.11 0.11
G132.41-4.42 : 01 58 31 +56 54.7 02 01 56 +57 09.21245 183.9 306.2 0.11 0.11
G132.45-3.38 02 00 50 +57 54.1 02 04 18 +58 08.5 597 303.7 43.7 0.39 0.22 MCG+10-04-01
G132.54+3.85 02 20 11 +64 44.9 02 24 07 +64 58.5 878 8.3 93.8 0.11 0.110.09
G132.59-3.20 02 02 14 +58 01.9 02 05 43 +58 16.2 597 293.5 50.1 0.280.06 0.030.11
G132.65-4.83 01 59 24 +56 26.8 02 02 49 +56 41.21245 177.5 281.3 0.340.11 0.220.11
G132.67-3.23 02 02 45 +57 59.2 02 06 14 +58 13.5 597 289.9 47.5 0.170.11 0.170.11
G132.68-4.84 : 01 59 33 +56 26.2 02 02 58 +56 40.61245 176.3 280.7 0.11 0.06
G132.76+4.13 02 23 06 +64 56.3 02 27 05 +65 09.81241 291.3 96.9 0.34
G132.90+4.17 02 24 28 +64 55.6 02 28 27 +65 09.01241 283.5 95.6 0.220.17 0.170.110.06
G133.32-4.05 : 02 05 39 +57 00.3 02 09 07 +57 14.51245 132.0 311.7 0.22
G133.47-4.61 02 05 31 +56 26.0 02 08 58 +56 40.21245 132.3 281.0 0.12 0.11
G133.47-4.40 : 02 05 54 +56 38.2 02 09 22 +56 52.41245 129.6 292.0 0.220.06 0.220.06
G133.48+2.75 : 02 24 45 +63 23.2 02 28 39 +63 36.61241 288.3 13.4 0.11
G133.61-4.68 02 06 16 +56 19.4 02 09 43 +56 33.61245 126.5 275.3 0.280.11 0.170.06
G133.63-3.61 02 08 48 +57 20.1 02 12 18 +57 34.21245 109.6 330.1 0.670.450.060.900.450.06
G133.68-4.93 02 06 13 +56 04.0 02 09 40 +56 18.21245 126.5 261.6 0.17 0.030.17
G133.83-4.07 : 02 09 10 +56 50.0 02 12 39 +57 04.01245 106.0 303.3 0.11 0.11
G133.83+3.40 02 29 47 +63 51.8 02 33 45 +64 05.01241 256.7 36.8 0.560.22 0.340.17 IRAS02297+6351
G133.84-4.08 02 09 12 +56 49.8 02 12 41 +57 03.81245 105.7 303.1 0.10
G133.87-4.84 02 07 43 +56 05.8 02 11 10 +56 19.91245 115.5 263.5 0.220.11 0.220.11
G134.02+4.67 02 35 59 +64 57.5 02 40 04 +65 10.41241 218.3 93.8 0.340.13 IRAS02359+6457
G134.05-4.45 : 02 09 50 +56 24.8 02 13 19 +56 38.81245 100.3 281.0 0.110.07 0.220.11
G134.15-1.82 02 16 48 +58 52.2 02 20 25 +59 05.9 597 189.9 91.2 0.170.06
G134.19-4.39 02 10 54 +56 25.3 02 14 23 +56 39.31245 92.4 281.7 0.220.06 0.220.11
G134.22+4.06 02 35 29 +64 19.4 02 39 31 +64 32.31241 222.3 59.9 0.17 0.11 IRAS02354+6418*
G134.22+4.05 02 35 25 +64 18.5 02 39 27 +64 31.41241 222.7 59.1 0.450.11 0.340.11 IRAS02354+6418*
G134.69+4.71 : 02 41 53 +64 43.3 02 46 00 +64 55.91241 185.1 80.4 0.220.06
G134.70+4.70 02 41 56 +64 42.6 02 46 03 +64 55.21241 184.7 79.8 0.340.170.110.220.110.11
G134.81-4.07 02 15 54 +56 31.8 02 19 25 +56 45.61245 55.8 289.4 0.17 0.17 IRAS02159+5631
G135.01-4.27 02 16 46 +56 16.6 02 20 17 +56 30.31245 48.6 276.2 0.220.11 0.170.11
G135.06-4.71 02 16 06 +55 50.8 02 19 36 +56 04.61617 342.0 260.0 0.17 0.17
G135.13-4.41 02 17 17 +56 06.0 02 20 48 +56 19.71245 44.1 267.0 0.170.06
G135.34-4.08 02 19 28 +56 20.4 02 23 00 +56 34.01245 28.8 281.0 0.17 0.11
G135.40-4.76 : 02 18 13 +55 41.0 02 21 43 +55 54.71245 35.7 245.3 0.220.060.060.110.06
G135.61-4.21 02 20 59 +56 07.7 02 24 31 +56 21.31617 304.4 272.2 0.170.110.060.170.110.06
G135.63-4.27 02 20 58 +56 03.7 02 24 30 +56 17.31617 304.7 268.7 0.110.06
G135.66-3.61 02 22 50 +56 40.0 02 26 24 +56 53.51617 288.9 300.2 0.11 0.22
G135.70-3.79 02 22 38 +56 29.6 02 26 11 +56 43.11245 6.0 291.1 0.110.06 0.17
G135.71+1.75 02 39 10 +61 36.4 02 43 04 +61 49.1 597 46.3 242.1 0.340.11 0.22
G135.73-4.83 02 20 16 +55 30.0 02 23 46 +55 43.61617 312.0 239.1 0.17 0.17
G135.74-4.83 02 20 16 +55 29.9 02 23 46 +55 43.51245 19.5 236.5 0.220.11 0.220.11
G135.74-4.53 02 21 03 +55 47.1 02 24 34 +56 00.71245 14.7 252.3 1.120.90
Table 1: Optically detected galaxies in the region tex2html_wrap_inline1031, tex2html_wrap_inline1033
1) IRAS01546+6319 2) IRAS01546+5711.  

In our previous papers we found that only a few percent of the optical galaxies turned out to have counterparts in the IRAS Point Source Catalogue. This holds true also for the galaxy sample presented in this paper. Since the IRAS two-colour distribution shows the same pattern as already shown and dicussed e.g. in Paper II, we will not repeat it here. The same applies for the presentation of the size distribution function that indicates a complete size limited sample down to a certain diameter limit (0.4arcmin, see Fig. 6 in Paper II).

Acknowledgements

We would like to thank W. Jais for his help in the data acquisition. This work was supported by the "Fonds zur Förderung der wissenschaftlichen Forschung'', project no. P8325-PHY and by the "Jubiläumsfonds der Österreichischen Nationalbank'', project No. 4713 (computer facilities).


next previous
Up: Penetrating the "zone

Copyright by the European Southern Observatory (ESO)
web@ed-phys.fr