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MORPHOLOGICAL DEPENDENCE OF THE ORIENTATION OF THE SPIN VECTORS OF DISK GALAXIES IN THE VIRGO CLUSTER
HU, FX ; WU, GX ; SU, HJ ; LIU, YZ
1995
Source PublicationASTRONOMY AND ASTROPHYSICS
ISSN0004-6361
Volume302Issue:1Pages:45—57
AbstractBased on our database, the catalogue of 310 disk galaxies in the Virgo area, three sets of representative samples have been used to study the spatial distribution of the spin vectors of disk galaxies of the Virgo cluster. The main results are as follows:1. The orientation of spin vectors of disk galaxies of the Virgo cluster is found to be anisotropic, which is shown well in both the histogram and the chi(2) test of the theta distribution, but also in the histogram of the phi distribution (theta and phi are the polar angle and the azimuthal angle of the supergalactic coordinate system, respectively). Two humps at low and high theta in the histograms indicate excesses of the orientation of galaxies in the directions perpendicular and parallel to the Local supercluster (LSC) plane with respect to the expected random distribution. The discernible anisotropy, indicated by the dip near phi = +/- 90 degrees in the histogram of phi distribution, means that the projections or the LSC plane of the spin vectors of the disk galaxies in the virgo cluster tend to point towards the Virgo center.2. We have probably detected a morphological dependence of the orientation of the spin vectors of disk galaxies which may deserve special attention. The evidences are: (a) Both distinct humps at low and high theta are found to be strong for the spirals, however no high theta hump, i.e. an excess in the perpendicular direction, is found for the lenticulars; (b) The dip near theta = +/- 90 degrees may be deeper for the lenticulars than that for the spirals; (c) The results of the chi(2) test Of the area distribution with a bin size 30 x 30 square degrees shows significant anisotropy for spirals, but not for lenticulars.3, The anisotropic feature of both the theta and the phi distributions for the early-type spirals is found to be something in-between that for the lenticulars and the late-type spirals, which means the orientation of disk galaxies might constitute a continuous sequence from lenticulars to late spirals and irregulars alongside the Hubble sequence.
Subject Area天文和天体物理
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8483
Collection期刊(老文献)
Recommended Citation
GB/T 7714
HU, FX,WU, GX,SU, HJ,et al. MORPHOLOGICAL DEPENDENCE OF THE ORIENTATION OF THE SPIN VECTORS OF DISK GALAXIES IN THE VIRGO CLUSTER[J]. ASTRONOMY AND ASTROPHYSICS,1995,302(1):45—57.
APA HU, FX,WU, GX,SU, HJ,&LIU, YZ.(1995).MORPHOLOGICAL DEPENDENCE OF THE ORIENTATION OF THE SPIN VECTORS OF DISK GALAXIES IN THE VIRGO CLUSTER.ASTRONOMY AND ASTROPHYSICS,302(1),45—57.
MLA HU, FX,et al."MORPHOLOGICAL DEPENDENCE OF THE ORIENTATION OF THE SPIN VECTORS OF DISK GALAXIES IN THE VIRGO CLUSTER".ASTRONOMY AND ASTROPHYSICS 302.1(1995):45—57.
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