Even though a large fraction of high-redshift SCUBA galaxies host AGN activity (upward of 38%), we argue that in almost all cases the AGNs are not bolometrically important (i.e., contribute <20% of the energetics). Thus, most high-redshift SCUBA galaxies appear to be star-formation ...
A redshift is a shift in the frequency of an electromagnetic wave caused by an object’s motion. Light from objects moving away from an observer have their light waves shifted toward the red part of the spectrum. Redshift is commonly observed inastronomy, particularly in the observation of ve...
Three types of redshift At least three types of redshift occur in the universe — from the universe's expansion, from the movement of galaxies relative to each other and from "gravitational redshift," which happens when light is shifted due to the massive amount of matter inside of a gala...
What is the cause of the intense luminosity of active Galaxies, such as Quasars or Seyfert? What is meant by drift velocity? Explain in laymen's terms why light travels at the velocity that it does. When an object is painted red, what color is absorbed most? Why do objects illumin...
What causes the jets to shoot out in opposite directions? The jets shoot out in opposite directions because of the black hole's intense magnetic field. As the matter falls towards the black hole, it becomes ionized and interacts with the magnetic field, causing the jets to be ejected in o...
Light bends around a massive object, such as a black hole, causing it toact as a lensfor the things that lie behind it. Astronomers routinely use this method to study stars and galaxies behind massive objects. The Einstein Cross, aquasarin thePegasus constellation,according to the European Sp...
stars in the galaxy. Quasars tend to have accretion discs of gas and dust; when material from the disc falls into the Quasar, it is ejected as electromagnetic radiation. Once the accretion disk is used up, it becomes passive. Quasars tend to be at the centres of galaxies far, far away...
Evidence for strong dynamical evolution in disk galaxies through the last 11 Gyr. GHASP VIII: A local reference sample of rotating disk galaxies for high r... Due to their large distances, high-redshift galaxies are observed at a very low spatial resolution. In order to disentangle the evolu...
The evidence for a redshift dependence of radio galaxy type is quite good and is the result of multiwavelength observations across the entire electromagnetic spectrum. What do astrophysicists think causes the massive jetted AGNs in radio galaxies? The general agreement is that magnetic fields are...
The morphological properties have been used to identify some types of restarted radio sources (i.e., double–double radio galaxies, DDRG [16]). However, radio sources in the remnant phase (when the activity from the central SMBH stops or dims) and in the restarted phase (when the SMBH ...