A Search for Galaxies behind the Milky Way between l=210(deg) and 230(deg)

A systematic galaxy search has been carried out by means of 18 film copies of the UK Schmidt Southern Infrared Atlas on the Milky Way between l=209(deg) and 234(deg) at b=0(deg) covering about 500 square degrees. We have detected galaxies larger than 0.1 mm (6.7 arcsec) in diameter on film copy by visual inspection, the limiting size of which is about twice that of the faintest stellar images. A total of 2411 galaxies were detected; of these, thirty have been given in catalogs of galaxies, and eighty one are IRAS galaxies. A catalog of the detected galaxies was made regarding position, size, galaxy type, and cross identification. The number of galaxies detected per square degrees, N_gal, decreases with increasing column density of hydrogen atoms in the Galaxy, N(H i), as a function of the galactic latitude ranging in (1--9) times 10(21) cm(-2) . The search is nearly complete over the whole survey region for galaxies with diameters larger than 0.45 arcmin; the detectability reduces with decreasing apparent luminosity of the galaxies. For a size-limited survey of galaxies with diameters larger than 0.45 arcmin we find the relation log(N_gal/1.4) = -N(H i)/1.1 times 10(22) = -0.57A_iN(H i), where A_i is the Galactic extinction coefficient; this value was estimated to be about 1.6 times 10(-22) mag cm(2) H-atom(-1) for an effective wavelength of lambda 790 nm. The value of A_i is about 0.6-times the usually accepted value. Three candidates of clusters of galaxies were found around b=5(deg) with a size of 3(deg) .