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|Metallicity Indices for Multi-Population Models.II.Bulges of Galaxies|
We report metallicity indices in the Lick system (Hβ, Fe52, Fe53,NaD, Mg_2_) for a sample of 45 spiral bulges in the southern hemisphere.The velocity dispersion σ was also derived for each object. Spiralbulges and elliptical galaxies show a continuity in diagrams like theplane Mg_2_- or σ-Mg_2_. Using calibrations derived fromchemical evolutionary models, we estimated metallicities and abundanceratios for those bulges. The sample mean metallicity is [Fe/H]= -0.19+/- 0.27(rmsd), and the mean abundance ratios are [Mg/Fe] = 0.46 +/-0.11 (rmsd) and [Na/Fe] = 0.45 +/- 0.19(rmsd). These abundances suggestthat spiral bulges (like E's) were chemically enriched by type IIsupernovae, and that the main star formation era occurred in a timescale of the order of 1-2 Gyr.
|The Catalog of Southern Ringed Galaxies|
The Catalog of Southern Ringed Galaxies (CSRG) is a comprehensivecompilation of diameters, axis ratios, relative bar position angles, andmorphologies of inner and outer rings, pseudorings, and lenses in 3692galaxies south of declination -17 deg. The purpose of the catalog is toevaluate the idea that these ring phenomena are related to orbitalresonances with a bar or oval in galaxy potentials. The catalog is basedon visual inspection of most of the 606 fields of the Science ResearchCouncil (SRC) IIIa-J southern sky survey, with the ESO-B, ESO-R, andPalomar Sky surveys used as auxiliaries when needed for overexposed coreregions. The catalog is most complete for SRC fields 1-303 (mostly southof declination -42 deg). In addition to ringed galaxies, a list of 859mostly nonringed galaxies intended for comparison with other catalogs isprovided. Other findings from the CSRG that are not based on statisticsare the identification of intrinsic bar/ring misalignment; bars whichunderfill inner rings; dimpling of R'1pseudorings; pointy, rectangular, or hexagonal inner or outer ringshapes; a peculiar polar-ring-related system; and other extreme examplesof spiral structure and ring morphology.
|Integrated photometric properties of early type ringed galaxies|
In order to elucidate the structure and evolution of barred and ovalgalaxies, over 300 of the more than 1000 galaxies in the current versionof the Catalog of Southern ringed Galaxies are subclassified intoring/pseudoring categories. Photoelectric multicolor photometry of 29ringed galaxies showing outer rings and pseudorings of the suspectedouter Lindblad resonance types reveals nothing unusual about the globalstar formation rates. The galaxies have relatively normal colors fortheir type but slightly lower than average surface brightnesses. It isdemonstrated that integrated colors (V-R)T and(V-I)T can be derived reasonably well by using standard RC2color curves originally designed for (B-V)T and(U-B)T determinations. A comparison between the presentintegrated photoelectric parameters and those in the ESO-LV data basereveals good agreement on B-band magnitudes but not total R-bandmagnitudes or B-R colors.
|Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members|
This paper gives a catalog of the groups and associations obtained bymeans of a revised hierarchical algorithm applied to a sample of 4143galaxies with diameters larger than 100 arcsec and redshifts smallerthan 6000 km/s. The 264 groups of galaxies obtained in this way (andwhich contain at least three sample galaxies) are listed, with the looseassociations surrounding them and the individual members of eachaggregate as well; moreover, the location of every entity among 13regions corresponding roughly to superclusters is specified. Finally,1729 galaxies belong to the groups, and 466 to the associations, i.e.,the total fraction of galaxies within the various aggregates amounts to53 percent.
|The supergalactic plane redshift survey|
Redshift measurements, about 1000 of which are new, are presented for1314 galaxies in a survey toward the apex of the large-scale streamingflow for ellipticals. The velocity histogram shows that the excess ingalaxy number counts in this area is due to a substantial concentrationof galaxies with discrete peaks at V about 3000 km/s and V about 4500km/s. After correction for the sampling function, the centroid of thedensity distribution is found to be near V about 4500 km/s.Normalization to the more extensive SSRS survey, which was selected bythe same criteria, shows that the region studied contains a considerableoverdensity of galaxies from 2000 to 6000 km/s. This result is in goodagreement with the 'great attractor' model suggested by Lynden-Bell etal. (1988) which attributes the peculiar motions of elliptical galaxiesover a large region of space to an extensive mass overdensity whichincludes the Hydra-Centaurus and Pavo-Indus superclusters. The centroidof the density enhancement is also consistent with new data by Dresslerand Faber (1990) of peculiar motions of elliptical and spiral galaxies,both of which show a zero crossing of the Hubble line at approximately4500-5000 km/s.
|The outer Lindblad resonance and the morphology of early type disk galaxies|
CCD images and color index maps of 22 galaxies from the Catalog ofSouthern Ringed Galaxies (CSRG) are used to examine distinct categoriesof the morphology of outer rings and pseudorings in SB and SAB galaxies,which bear a remarkable resemblance to the gaseous rings which developednear the outer Lindblad resonance in n-body models of barred spirals. Ina class of rings where the arms wind about 180 deg with respect to theends of a bar or oval, nine out of 11 examples display blue nuclei orcircumnuclear rings in a B-I color index map. This contrasts with aclass where the arms wind about 270 deg with respect to the ends of abar or oval, for which only 3 out of 11 examples display nuclear starformation. A similar correlation regarding the presence or absence of aclear dust lane pattern is found within the region of a bar or inneroval. Images of eight additional CSRG galaxies which displaymorphological details of special interest are presented.
|Southern Galaxy Catalogue.|
|Spectroscopic survey of southern compact and bright-nucleus galaxies. V|
Redshifts are given for 265 galaxies. The majority show absorptionspectra (the present list being complementary to Paper IV) but a fewemission line galaxies, including three Seyfert 2 galaxies, are present.General characteristics and spatial distribution are discussed briefly.
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