In Table 2 we list our galaxy candidates in order of increasing galactic longitude. Due to the editorial policy of Astronomy and Astrophysics we publish this table, which comprises 58 print pages, in electronic form. Thus, only a sample page (the first page of Table 2) is given here.
The galaxy designations follow the IAU recommendation for the nomenclature
of new objects: ZOAGG.ZOAG means "Zone of Avoidance Galaxy", G stands for galactic coordinates,
and and are galactic longitude and latitude,
In Col. 1 the designation of the galaxies is given. For reasons of brevity the prefix ZOAGG is omitted. In a few cases, this designation is not unambiguous, i.e. 2 (or more) very closely located galaxies could not be separated. For this we add a suffix "a'' for the object with the smaller (smallest) right ascension. If the right ascensions are practically the same, then the object with the smallest declination is given the suffix "a'', then "b'' for the next higher declination and so forth. If both R.A. and Dec. are almost identical, then (and only then) the more optically extended one of the objects gets the suffix "a". Columns 2 and 3 give the equatorial coordinates for epoch 1950.0, Cols. 4 and 5 for epoch 2000.0 (Julian). In Col. 6 we present maximum and minimum diameters (in arcmin) measured from the POSSII R film copies. In the last column we list cross-identifications with galaxies taken from the NASA Extragalactic Database (NED), and with IRAS point sources taken from SIMBAD. For cross-identifications with the IRAS PSC catalogue we used our above-given positional uncertainty and checked whether our optical error bars fell within the IRAS uncertainty ellipse or not.
In Fig. 1 (top) all our galaxy candidates are plotted, and in Fig. 1 (bottom) the 100 m IRAS surface brightness is shown. From Fig. 1 (top), several distinctive features are obvious: First, the ZOA does not appear to be prominent (particularly if compared, e.g., with Fig. 3 in Seeberger et al. (1994) that is based on galaxy candidates found on POSSI) - there are numerous galaxy candidates even very close to the galactic equator. Second, the number of galaxies at negative galactic latitudes is much larger than at positive ones. Third, there are only very few objects at at positive latitudes. The distribution of galaxies can be influenced in two main ways, i.e. it can be of i) galactic (i.e. foreground) origin and/or it can ii) reflect the true distribution, like concentrations (clusters) of galaxies. The former
|Figure 1: Top: Distribution of the galaxies in galactic coordinates. The south-west corners of the fields lack objects due to an area containing sensitometer spots. Bottom: A grayscale map of IRAS 100 m intensities (white corresponds to bright emission). Regions outside the surveyed area are black|
Nevertheless, we were able to directly compare the total number of galaxy candidates selected in optical surveys on POSSI E and POSSII R plates since a substantial portion of our region was already surveyed on the older plates (Lercher et al. 1996; Saurer et al. 1997). By counting the galaxies in the intersection of both surveys we obtained 674 and 2072 galaxies detected on POSSI and POSSII, respectively. Thus, we may roughly state that on the "new" POSS R plates (i.e. POSSII) 3.1 more galaxy candidates are selected than on the "old" ones.
|Figure 2: Squares: logarithm of the total number of galaxies down to a given angular diameter versus the logarithm of this very diameter. The line corresponds to the expected slope of -3|
This work was supported by the "Jubiläumsfonds der Österreichischen Nationalbank'' under project No. 5776. We would also like to thank S. Kimeswenger, W. Marchiotto and S. Temporin for various help.
This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration.
We have made use of the SIMBAD database which is managed by the Centre de Données astronomiques de Strasbourg (CDS).
Copyright The European Southern Observatory (ESO)