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Spiral galaxy

en.wikipedia.org/wiki/Spiral_galaxy

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 ... found in low-density regions and are rare in the centers of galaxy clusters. ... blue stars (due to t...

Chapter16 HW Questions with Answers - Chapter 16 1.) Rotation ...

www.coursehero.com/file/11648526/Chapter16-HW-Questions-with-Answers/

due to the galaxy density and collisions, … are rare in the centers of clusters : spirals 9.) Collisions between galaxies : cause the gas and dust to collide, leading ...

Test 4 Review Clicker Questions

physics.unm.edu/Courses/Saul/Common/Astr101_Exams/Exam-4/Test4_ReviewClickerQuestions.ppt

b) 30,000 light-years from the center in a globular cluster. ... High-speed motion of gas and stars near the Milky Way Galaxy's center is explained by ..... Due to the density and collisions among galaxies, ______ are rare in the centers of ...

Galaxies, Properties in Relation to Environment - NED

ned.ipac.caltech.edu/level5/ESSAYS/Dressler/dressler.html

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 typi...

The Pinwheel Galaxy | NASA

www.nasa.gov/multimedia/imagegallery/image_feature_2265.html

May 31, 2012 ... For more Chandra images, multimedia and related materials, visit: ... Galaxy clusters are the largest structures in the Universe held together by gravity. ... collision that caused the re-ignition of radio emission in the system. ... Because of the intense density, pressure, and magnetic fields near the center of ....

Surprising black-hole discovery changes picture of globular star ...

phys.org/news/2012-10-black-hole-discovery-picture-globular-star.html

Oct 3, 2012 ... They hoped to find evidence for a rare type of black hole in the cluster's center. They wanted to find what scientists call an intermediate-mass ...

The Cluster-Merger Shock in 1E 0657-56: Faster than the Speeding ...

arxiv.org/pdf/astro-ph/0703199

Mar 9, 2007 ... of unequal-mass clusters, for which the gas density and temperature jumps across the prominent bow shock ... cold dark matter (CDM) halos collide and merge hierarchi- cally. ... plying a rare merger event that might be in conflict with the .... due to the ram-pressure force acting on the gas in the center.

The Galactic Center Massive Black Hole and Nuclear Star Cluster

arxiv.org/pdf/1006.0064

The Galactic Center is an excellent laboratory for studying phenomena and .... The stellar density in the nuclear cluster increases inward from a scale of tens of ..... projected radial motion on the sky (jz = 0) can be due to either true 3D radial ..... If the 'heavy' stars (mass mh,number Nh) are rare while the 'light'...

X-ray discovery of a dwarf-galaxy galaxy collision Abstract - arXiv.org

arxiv.org/pdf/1308.0728

density of any gas associated with the cluster must be extremely low (<10-4 ... The center of the collision is about 4.3 kpc from the center of NGC 1232. ... diffuse emission in other spirals, making it unlikely that this emission is due to star formation regions that often ..... Such collisions are probably rare in the current epoc...

Galaxies - SkyServer - SDSS

skyserver.sdss.org/dr1/en/astro/galaxies/galaxies.asp

Stars, gas, and interstellar dust orbit the center of the galaxy due to the gravitational ... The Milky Way has more than a hundred billion stars, but the stars are so far apart that they almost never collide. ... ago, because galaxies are likely to have formed first in high-density regions like galaxy clusters. ... Irr II galaxies are...

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Chapter 25 - Astronomy 107 with N/a at St. Cloud State University ...

www.studyblue.com

May 2, 2013 ... Based on galactic rotation curves and cluster dynamics, we think dark matter ... Due to the galaxy density and collisions, ______ are rare in the ...

Galaxies - Astronomy Notes

www.astronomynotes.com

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.

ch21 - NASA History Homepage

history.nasa.gov

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 gas.