Complete your Richard Pogge collection. These lecture podcasts are audio recordings of daily lectures from Prof. Richard Pogge's Winter Quarter 2006 section of Astronomy 162 at The Ohio State University.
Richard Pogge, MTWThF 9:30. Lecture Audio Podcasts - Winter 2006. Feb 15: When Galaxies Collide: Interacting Galaxies. Feb 16: Active Galaxies & Quasars. Unit 5: "The Machinery of Night": The Evolving Universe. Feb 20: A Tale of Two World Views: Special Relativity. Feb 21: Space, Time, & Gravity: General Relativity. Feb 22: Einstein's Universe. Feb 23: The Expanding Universe.
Arp 142: When Galaxies Collide. NASA, ESA and the Hubble Heritage Team (STScI/AURA). This image shows the two galaxies interacting NASA, ESA, SAO, CXC, JPL-Caltech, and STScI. This beautiful composite image of two colliding galaxies was released by NASA's Great Observatories. The collision between the Antennae galaxies, which are located about 62 million light-years from Earth, began more than 100 million years ago and is still occurring.
When galaxies collide. This delicate smudge in deep space is far more turbulent than it first appears. Known as IRAS 14348-1447 - a name derived in part from that of its discoverer, the Infrared Astronomical Satellite (IRAS for short) - this celestial object is actually a combination of two gas-rich spiral galaxies. This doomed duo approached one another too closely in the past, gravity causing them to affect and tug at each other and slowly, destructively, merge into one.
The 15 galaxies of the University of Sheffield study are doing something those other thousands of galaxies weren’t doing. They’re undergoing collisions with neighboring galaxies. Study co-author James Mullaney said in a statement: Our surprising findings show that the rate of TDEs dramatically increases when galaxies collide.
When galaxies collide, the result is nothing short of spectacular. While this type of event only takes place once every few billion years (and takes millions of years to complete), it is actually pretty common from a cosmological perspective. TDEs were first proposed in 1975 as an inevitable consequence of black holes being present at the center of galaxies. When a star passes close enough to be subject to the tidal forces of a SMBH it undergoes what is known as spaghetification, where material is slowly pulled away and forms string-like shapes around the black hole.
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