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Red quasars are quasars with optical colors that are redder than normal quasars, thought to be the result of moderate levels of dust extinction within the quasar host galaxy. Infrared surveys have demonstrated that red quasars make up a substantial fraction of the total quasar population.
APM 08279+5255 was initially identified as a quasar in 1998 during an Automatic Plate Measuring Facility (APM) survey to find carbon stars in the galactic halo.The combination of its high redshift (z=3.87) and brightness (particularly in the infrared) made it the most luminous object yet seen in the universe.
The current SDS-3 constellation, consisting of three Molniya orbit type and two geostationary satellites. The Satellite Data System (SDS) is a system of United States military communications satellites.
Quasars, Redshifts and Controversies is a 1987 book by Halton Arp, an astronomer famous for his Atlas of Peculiar Galaxies (1966). [1] Arp argued that many quasars with otherwise high redshift are somehow linked to close objects such as nearby galaxies .
It was discovered in X-Ray by Varsha Gupta et al. at the Chandra X-Ray observatory [20] It is also notable for being the first case of a quasar being lensed by an almost face-on spiral galaxy. [21] Galaxy MG1654+1346 features a radio ring. The image in the ring is that of a quasar radio lobe, discovered in 1989 by G.Langston et al. [22]
The expansion of the universe causes the light from these distant stars and quasars to redshift, so that the total light flux from the sky remains finite. Thus the observed radiation density (the sky brightness of extragalactic background light ) can be independent of finiteness of the universe.
This suggests the quasar is currently undergoing an intense wave of star formations thus increasing its luminosity. [3] A radio jet has also been found on the side of quasar according to a study published in 2023. [5] CCD image of the Cloverleaf quasar taken in March 1988 by the ESO/MPI 2.2m telescope. The four separated images are part of the ...
The quasar's redshift indicates that it is located about 8 billion light years from Earth, while the lensing galaxy is at a distance of 400 million light years. The apparent dimensions of the entire foreground galaxy are 0.87 × 0.34 arcminutes, [7] while the apparent dimension of the cross in its centre accounts for only 1.6 × 1.6 arcseconds.