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

Simple item page
dc.contributor.authorFairall, A P
dc.contributor.authorWoudt, P A
dc.contributor.authorKraan-Korteweg, R C
dc.date.accessioned2021-10-08T06:20:11Z
dc.date.available2021-10-08T06:20:11Z
dc.date.issued1998
dc.description.abstractIn our systematic optical galaxy search behind the southern Milky Way, 3760 (mostly unknown) galaxies with diameters were identified in the Crux region (, Woudt & Kraan-Korteweg 1997). 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 () objects with the 1.9 m 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. 1995), 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 ( 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 6000 km s-1 (Fairall & Paverd 1995). The main outcome of this survey however, is the recognition of another massive extended structure between km s-1 . This broad structure, dubbed the Norma Supercluster (Woudt et al. 1997), 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.
dc.identifier.apacitationFairall, A. P., Woudt, P. A., & Kraan-Korteweg, R. C. (1998). Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region. <i>Astronomy and Astrophysics Supplement Series</i>, 127(3), 463 - 470. http://hdl.handle.net/11427/34218en_ZA
dc.identifier.chicagocitationFairall, A P, P A Woudt, and R C Kraan-Korteweg "Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region." <i>Astronomy and Astrophysics Supplement Series</i> 127, 3. (1998): 463 - 470. http://hdl.handle.net/11427/34218en_ZA
dc.identifier.citationFairall, A.P., Woudt, P.A. & Kraan-Korteweg, R.C. 1998. Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region. <i>Astronomy and Astrophysics Supplement Series.</i> 127(3):463 - 470. http://hdl.handle.net/11427/34218en_ZA
dc.identifier.issn0365-0138
dc.identifier.issn0587-2065
dc.identifier.issn1286-4846
dc.identifier.ris TY - Journal Article AU - Fairall, A P AU - Woudt, P A AU - Kraan-Korteweg, R C AB - In our systematic optical galaxy search behind the southern Milky Way, 3760 (mostly unknown) galaxies with diameters were identified in the Crux region (, Woudt & Kraan-Korteweg 1997). 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 () objects with the 1.9 m 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. 1995), 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 ( 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 6000 km s-1 (Fairall & Paverd 1995). The main outcome of this survey however, is the recognition of another massive extended structure between km s-1 . This broad structure, dubbed the Norma Supercluster (Woudt et al. 1997), 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. DA - 1998 DB - OpenUCT DP - University of Cape Town IS - 3 J1 - Astronomy and Astrophysics Supplement Series LK - https://open.uct.ac.za PY - 1998 SM - 0365-0138 SM - 0587-2065 SM - 1286-4846 T1 - Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region TI - Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region UR - http://hdl.handle.net/11427/34218 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34218
dc.identifier.vancouvercitationFairall AP, Woudt PA, Kraan-Korteweg RC. Extragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region. Astronomy and Astrophysics Supplement Series. 1998;127(3):463 - 470. http://hdl.handle.net/11427/34218.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics Supplement Series
dc.source.journalissue3
dc.source.journalvolume127
dc.source.pagination463 - 470
dc.source.urihttps://dx.doi.org/10.1051/aas:1998371
dc.subject.othergalaxies: redshifts
dc.subject.othergalaxies: clusters of
dc.subject.otherlarge-scale structure of the Universe
dc.titleExtragalactic large-scale structures behind the Southern Milky Way: II. Redshifts obtained at the SAAO in the Crux region
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
FairallAP_Extragalactic_l_1998.pdf
Size:
2.61 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Journal Articles