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1998A&AS..127..463F - Astron. Astrophys., Suppl. Ser., 127, 463-470 (1998/February-1)

Extragalactic large-scale structures behind the Southern Milky Way. II. Redshifts obtained at the SAAO in the Crux region.

FAIRALL A.P., WOUDT P.A. and KRAAN-KORTEWEG R.C.

Abstract (from CDS):

In our systematic optical galaxy search behind the southern Milky Way, 3760 (mostly unknown) galaxies with diameters D>0.2' were identified in the Crux region (287°≲l≲318°, |b|≲10°, Woudt & Kraan-Korteweg (1998, in press). Prior to this investigation, only 65 of these galaxies had known redshifts. In order to map the galaxy distribution in redshift space we obtained spectra for 226 bright (BJ≲18.0mag) objects with the 1.9m telescope of the South African Astronomical Observatory (SAAO). Redshifts could be determined for 209 objects, of which 173 have good signal-to-noise ratios. Of the 36 tentative redshifts, four are confirmed through independent values in the literature. The redshifts of three objects indicate them to be galactic in origin. One of these confirms a suspected Planetary Nebula. For 17 of the galaxies, no redshift could be determined due to poor signal-to-noise ratios. In addition, 26 redshifts have have been measured in the Hydra-Antlia region investigated earlier (Kraan-Korteweg et al. 1995A&A...297..617K), of which one is a tentative estimate. Two main structures crossing the Galactic Plane in the Crux region have now become clear. A narrow, nearby filament from (l, b)=(340°, -25°) to the Centaurus cluster can be traced. This filament runs almost parallel to the extension of the Hydra-Antlia clusters found earlier and is part of what we have earlier termed the Centaurus Wall'' extending in redshift-space between 0≤v≤6000km/s (Fairall & Paverd 1995, in Wide-Field Spedctroscopy and the Distant Universe, p. 121). The main outcome of this survey however, is the recognition of another massive extended structure between 4000≤v≤8000km/s. This broad structure, dubbed the Norma Supercluster (Woudt et al. 1997, in press), runs nearly parallel to the Galactic Plane from Vela to ACO 3627 (its centre) from where it continues to the Pavo cluster. This massive structure is believed to be associated with the Great Attractor. The survey has furthermore revealed a set of cellular structures, similar to those seen in redshift space at higher galactic latitudes, but never before seen so clearly behind the Milky Way.

Journal keyword(s): galaxies: redshifts - galaxies: clusters of - large-scale structure of the Universe

VizieR on-line data: <Available at CDS (J/A+AS/127/463): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Tables 1, 3, 4: WKK98 NNNN N=209+17+51 among 3760. Table 2: RKK NNNN N=18 new. Table 2: SKK98 NNNN N=3.

CDS comments: WKK NNNN = WKK98, KK = RKK, SKK = SKK98. The possible PN is 'NAME WKK P8' in SIMBAD.