It is now believed that bars are widely distributed structural features of many disk galaxies. According to current estimates, one third of spiral galaxies have well-expressed, bright bars (of type SB), while another third have faint inner bars (SAB). Bars are also observed in irregular galaxies, such as the Large Magellanic Cloud. In galaxies of these types, the bar is usually located asymmetrically relative to the center of the parent galaxy.
In disk galaxies one sometimes observes bars that are seen on only one side of the nucleus, while the other half is either very faint or entirely absent. At the ends of bars one often observes regions of increased brightness in the form of arcs or superassociations, which are centers of star formation, in all probability.
Individual barred galaxies have been investigated in detail for many years. There has been much photometric, morphological, spectroscopic, and kinematic work published. As a result of these investigations, valuable data have been obtained on the internal structure of these interesting objects. Many phenomena occurring in disk galaxies are related to the presence of a bar.
Bearing in mind the important role of bars in the various observed phenomena in disk galaxies, we have compiled a complete sample of SB and SAB galaxies.
We used the LEDA data set
[1] to compile the
catalog. We chose all SB and SAB galaxies north of
= - 10°.
Our catalog is complete down to 13.5m with respect to both the logN - m relationship and the V/Vm criterion. The catalog contains a total of 690 objects. Additional data were taken from the NED data set. (1)
The following are given in successive columns of Table 1: 1. The name of the object from the NGC, IC, UGC, or MCG catalogs. 2. The code for the galaxy's morphological type in accordance with RC3 [2]: -3 = E-0, -2 = 0, 0 = 0a, 1 = a, 2 = ab, 3 = b, 4 = bc, 5 = c? 6 = c, 7 = cd, 8 = d, 9 = m, 10 = Irr. 3. The morphological type, where the letters S, C, I, L, and D denote spiral, compact, irregular, lens-shaped, and diffuse galaxies, respectively. 4. Type of galactic activity, taken from the catalog of active galaxies [3]. We used the same notation as in that catalog, i.e., S1 and S2 denote Type 1 and Type 2 Seyfert galaxies, respectively; S3 denotes a liner; and H2 a galaxy with a spectrum resembling that of H II regions. 5. Number in the Lyon catalog [1] of the group in which the given galaxy is found. 6. log R25, where R25 is the ratio of the semimajor and semiminor axes corresponding to 25m per square arcsecond. 7. The logarithm of the galaxy's major diameter in units of 0.1', corrected for the object's inclination and Galactic extinction. 8. The apparent stellar magnitude m. 9. The integrated B0 magnitude, corrected for Galactic and internal extinction, as well as for the redshift. 10 and 11. The corrected color indices (U - B)0 and (B - V)0. 12. The Virgo-centric radial velocity.
1 The NASA/IPAC Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space Administration (NASA). Back.