A spiral galaxy is a type of galaxy originally described by Edwin Hubble in his
1936 work The ... found in low-density regions and are rare in the centers of
galaxy clusters. ... blue stars (due to ...
Some active galaxies have jets emanating from two sides of the center. ... 87 (
M87 for short or NGC 4486) a very active "radio" galaxy in the Virgo Cluster. ...
Synchrotron radiation originates from collisions of electrons and positrons .... But
blazars are fairly rare among active nuclei, with only about 2,700 known at this
May 1, 2013 ... This explains why galaxies are grouped in clusters and even clusters ... the
elliptical galaxies while the lower density concentrations would ... stars that star-
star collisions are very rare when the galaxies collide. ... found close to the
centers of galaxies were formed from the collision and merging of galaxies.
globular star clusters, galaxies, clusters of galaxies. • If 2-body ... Sometimes stars
actually collide, but that happens only in the ... density distribution function, f(r,v,t)
... In a large stellar system, gravitational force at any point due .... the orbit than
rare close encounters… .... of energy in the center, to replace the esc...
Galaxies cluster; although a small fraction live in splendid isolation, the ... million
light-years); therefore, encounters between galaxies are relatively rare. ... (as
would be common in a rich cluster) because a low-speed collision would ...
Furthermore, the fact that the stellar density at the center of an elliptical galaxy is
Also, large-scale structure is covered (galaxy clusters and collisions and
superclusters). ... and be a regular spiral where the arms come right out of the
galaxy center, ... The flattened shape is not due to rotational flattening but to how
the orbits ... by the galaxy moving quickly through the low-density intergalactic
medium (hot, ...
Note that the classification of a given galaxy is not always universally agreed ...
Most disc stars in our galaxy have completed over 40 orbits around the galactic
center. ... Near IR (1-5 μm) is due mostly to red giants, so it tracks mass; blue light
is .... Collisions between galaxies in a cluster are much more frequent than those
Jan 25, 2016 ... Gravity, Part 4: Globular Clusters & Galaxies: The dynamics of globular ... all stars
in the cluster move in Kepler orbits around the center of mass. ... the expected
velocity of stars in a region based on the density in that ... Astronomers used to
believe physical collisions between stars were extremely rare and ...
In sharp contrast are the spiral galaxies nearer to the center of the cluster. ... This
trend continues into the core of the cluster, where spirals are rare. ... It seems to
have been related to the efficiency with which stars were born ... They have
shown that Virgo and other rich clusters are pervaded by a very hot low density
The constellation of Virgo (The Virgin) is especially rich in galaxies, due in part to
the ... Gravitational interactions — from glancing blows to head-on collisions, tidal
...... greater density and show a strong concentration toward the galaxy's center.
..... Or, they may be very rare objects that formed in a region or period of t...