3C 273 : A Star-Like Object with Large Red-Shift

  title={3C 273 : A Star-Like Object with Large Red-Shift},
  author={M. R. Schmidt},
In the early 1960s, astronomers were puzzled by quasars — sources of intense radio emission that seemed to be stars, but had unintelligible optical spectra. In 1963, Maarten Schmidt solved the puzzle by recognizing the Balmer lines of hydrogen, strongly redshifted, in the spectrum of the quasar 3C 273. Schmidt reached the "most direct and least objectionable" conclusion, that 3C 273 was no star, but the enormously bright nucleus of a distant galaxy. 
21-cm Absorption of the Radiation from 3C273
THE radio source 3C273 has been identified1,2 with a star-like object of about thirteenth magnitude having a faint jet. However, the optical spectrum of the star contains a number of broad emission
Optical Studies of Quasars and BL LAC Objects
Quasistellar objects must count as one of the great discoveries of radio astronomy. In the late 1950’s, as radio source positions became more accurate, a number of blue stellar objects were
Discovery of the most distant luminous quasar to date: J0313-1806
  • Physics
  • 2022
Distant quasars are unique media for studying topics such as the formation mechanisms of first-generation seed black holes, the interaction of active galactic nuclei and their host galaxies, and the
Ultraviolet spectrum of quasi–stellar object 3C273
The first direct observation of the ultraviolet spectrum of a quasi-stellar object (QSO) has been made with a rocket-borne telescope. The emission line spectrum of 3C273 is similar to the spectra of
A disrupted radio jet inside the host galaxy of the quasar 3C48
THE nearby quasar 3C48 was the first to be optically identified1, and its redshift, z = 0.368 (ref. 2), was the second, after that of 3C2733, to be determined. Despite this pedigree, its detailed
The discrete sources of radio emission were first distinguished from the general background radiation during the 1940’s as a result of their rapid amplitude scintillations ; and initially, it was
The discovery of quasars
Although the extragalactic nature of quasars was discussed as early as 1960, it was rejected largely because of preconceived ideas about what appeared to be an un- realistically high radio and
Active Galactic Nuclei
So far, we have discussed the radio continuum (specifically: the synchrotron) emission of normal, i.e. star-forming galaxies, along with their magnetic field. As pointed out in Sect. 5.5, their
Active Galactic Nuclei and Pulsars
With the discovery of radio emission of extraterrestrial origin, it had opened a new and broader window in the electromagnetic spectrum to observe the sky. Two of the common sources of radio
Globular Clusters as Remnants of Quasars
IN the past two years many theories have been advanced for the explanation of the extraordinarily powerfully emitting cosmic energy sources known as quasistellar radio-sources, or quasars for short.