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Transcript: Galaxies in close proximity are called interacting galaxies. Interacting galaxies might be gravitationally bound to each other, or they may simply be passing on trajectories through the universe that bring them close together. Interacting galaxies are affected by each other’s gravity. Tidal forces can act to cause mass or gas to flow towards the centers, and gas can pass from one galaxy to the other. There’s good evidence that interacting galaxies show increased incidence of nuclear activity as manifested by Seyfert nuclei, radio emission, or x-ray emission. Thus interaction is a trigger for nuclear activity.
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ค้นหาตอนที่ผ่านมา
ค้นหาตอนที่ผ่านมาของ 21. Deep Space and High-Energy Phenomena
ตอนอื่นๆ ใน PODCAST นี้
Transcript: Astronomers at Caltech became interested in the newly accurate radio positions of strong sources in the sky. They focused in particular on two sources, 3C48 and 3C273 which appeared to be associated with bluish stars. Since normal stars like the Sun do not emit strong radio waves this…
Transcript: The fact that quasars are at large distances and have huge luminosities depends on the cosmological interpretation of their redshift. There are some crucial distinctions between galaxies and quasars as far as redshift goes. For galaxies they follow a Hubble relation where distance ind…
Transcript: In the 1940s Grote Reber used amateur astronomy radio equipment in his backyard to discover the first cosmic sources of radio radiation. The first three sources he discovered were in the constellation of Sagittarius from the center of our own galaxy, and the constellation Cassiopeia fr…
Transcript: Quasars were mysterious when they were first discovered in the 1960s. But careful work showed that the quasar is surrounded by nebulosity, and eventually spectroscopy of the nebulosity showed that it was the light of stars in a normal galaxy. Thus quasar stands for quasi-stellar objec…
ข้อสงวนสิทธิ์: พอดแคสต์และอาร์ตเวิร์คที่ฝังอยู่ในหน้านี้มาจาก Dr. Christopher D. Impey, Professor, Astronomy ซึ่งเป็นทรัพย์สินของเจ้าของและไม่มีส่วนเกี่ยวข้องหรือรับรองโดย Listen Notes, Inc.
