Ýçindekiler
Görüntüler
Resim Yükleyin
DSS Images Other Images
Ýlgili Makaleler
Structures in the Great Attractor region
To further our understanding of the Great Attractor (GA), we haveundertaken a redshift survey using the 2-degree Field (2dF) instrumenton the Anglo-Australian Telescope (AAT). Clusters and filaments in theGA region were targeted with 25 separate pointings resulting inapproximately 2600 new redshifts. Targets included poorly studied X-rayclusters from the Clusters in the Zone of Avoidance (CIZA) Catalogue aswell as the Cen-Crux and PKS 1343-601 clusters, both of which lie closeto the classic GA centre. For nine clusters in the region, we reportvelocity distributions as well as virial and projected mass estimates.The virial mass of CIZA J1324.7-5736, now identified as a separatestructure from the Cen-Crux cluster, is found to be ~3 ×1014Msolar, in good agreement with the X-rayinferred mass. In the PKS 1343-601 field, five redshifts are measured ofwhich four are new. An analysis of redshifts from this survey, incombination with those from the literature, reveals the dominantstructure in the GA region to be a large filament, which appears toextend from Abell S0639 (l = 281°, b = +11°) to (l ~ 5°, b ~-50°), encompassing the Cen-Crux, CIZA J1324.7-5736, Norma and PavoII clusters. Behind the Norma cluster at cz ~ 15000kms-1, themasses of four rich clusters are calculated. These clusters (TriangulumAustralis, Ara, CIZA J1514.6-4558 and CIZA J1410.4-4246) may contributeto a continued large-scale flow beyond the GA. The results of theseobservations will be incorporated into a subsequent analysis of the GAflow.
| 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.
|
Yeni bir Makale Öner
Ýlgili Baðlantýlar
Yeni Bir Baðlantý Öner
sonraki gruplarýn üyesi:
|
Gözlemler ve gökölçümü verileri
Kataloglar ve belirtme:
|
