منابع مشابه
Ultralight Scalars and Spiral Galaxies
We study some possible astrophysical implications of a very weakly coupled ultralight dilaton-type scalar field. Such a field may develop an (approximately stable) network of domain walls. The domain wall thickness is assumed to be comparable with the thickness of the luminous part of the spiral galaxies. The walls provide trapping for galactic matter. This is used to motivate the very existenc...
متن کاملSupershells in Spiral Galaxies
Expanding supershells are perhaps the most prominent manifestation of the violent impact which massive stars have on the gaseous ISM. Commonly thought to be formed as a consequence of mechanical luminosity dumped into the ISM by OB associations, supershells can be viewed as a critical gauge of the energy source which ultimately supports interstellar turbulence. I will review the present underst...
متن کاملKinematically Lopsided Spiral Galaxies
Asymmetries in the distribution of light and neutral hydrogen are often observed in spiral galaxies. Here, attention is drawn to the presence of large-scale asymmetries in their kinematics. Two examples of kinematically lopsided galaxies are presented and discussed. The shape of the rotation curve –rising more steeply on one side of the galaxy than on the other– is the signature of the kinemati...
متن کاملSpiral Galaxies as Chiral Objects?
Spiral galaxies show axial symmetry and an intrinsic 2D-chirality. Environmental effects can influence the chirality of originally isolated stellar systems and a progressive loss of chirality can be recognised in the Hubble sequence. We point out a preferential modality for genetic galaxies as in microscopic systems like aminoacids, sugars or neutrinos. This feature could be the remnant of a pr...
متن کاملGravitational Lensing By Spiral Galaxies
We study gravitational lensing by spiral galaxies, using realistic models consisting of halo, disk, and bulge components combined to produce a flat rotation curve. Proper dynamical normalization of the models is critical because a disk requires less mass than a spherical halo to produce the same rotation curve—a face-on Mestel disk has a lensing cross section only 41% as large as a singular iso...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Modern Physics Letters A
سال: 2001
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s0217732301003206