Galaxies with rows

The results of a search for galaxies with straight structural elements, usu ally spiral-arm rows ("rows" in the terminology of Vorontsov-Vel'yaminov), are reported. The list of galaxies that possess (or probably possess) such rows includes about 200 objects, of which about 70% are brighter than 14(m) . On the whole, galaxies with rows make up 6-8% of all spiral galaxies with well-developed spiral patterns. Most galaxies with rows are gas-rich Sbc-S cd spirals. The fraction of interacting galaxies among them is appreciably higher than among galaxies without rows. Earlier conclusions that, as a rul e, the lengths of rows are similar to their galactocentric distances and th at the angles between adjacent rows are concentrated near 120 degrees are c onfirmed. It is concluded that the rows must be transient hydrodynamic stru ctures that develop in normal galaxies. (C) 2001 MAIK "Nauk/Interperiodica" .