0422-476: a shell galaxy with azimuthally distributed shells
نویسندگان
چکیده
منابع مشابه
Missing baryons in shells around galaxy clusters
Aims. The cluster baryon fraction is estimated from the CMB-scattering leptonic component of the intracluster medium (ICM); however, the observed cluster baryon fraction is less than the cosmic one. Understanding the origin of this discrepancy is necessary for correctly describing the structure of the ICM. Methods. We estimate the baryonic mass in the outskirts of galaxy clusters which is diffi...
متن کاملMeasuring galaxy potentials using shell kinematics
We show that the kinematics of the shells seen around some elliptical galaxies provide a new, independent means for measuring the gravitational potentials of elliptical galaxies out to large radii. A numerical simulation of a set of shells formed in the merger between an elliptical and a smaller galaxy reveals that the shells have a characteristic observable kinematic structure, with the maximu...
متن کاملObservations of Expanding Shells in the Dwarf Starburst Galaxy
Current Address: Bolton Fellow, CSIRO Australia Telescope National Facility, Cnr Vimiera & Pembroke Roads, Marsfield NSW 2122, Australia; email: [email protected] Packard Fellow Janksy Fellow
متن کاملHST / ACS observations of shell galaxies : inner shells , shell colours and dust . ?
Context. Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence for a merger event. Accurate photometry at high spatial resolution is needed to learn on presence of inner shells, population properties of shells, and dust in shell galaxies. Aims. Learn more about the origin of shells and dust in early type galaxies. Methods. V-I colours of shells and underlyi...
متن کاملAn Evolutionary Sequence of Expanding Hydrogen Shells in Galaxy Discs
Aims. Large HI shells, with diameters of hundreds of pc and expansion velocities of 10-20 km s−1 have been detected in their hundreds in the Milky Way and are well observed features of local gas rich galaxies. These shells could well be predicted as a result of the impact of OB associations on the ISM, but doubt has been cast on this scenario by the apparent absence of OB stars close to the cen...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2000
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2000.03418.x