Long-term behavior of the Seyfert galaxy 3C 120
Long term behavior of blue photographic luminosity of Seyfert galaxy 3C 120 nucleus, considering similarity to quasar 3C 273B
Hanley, C. M.↗
SEARCH · Engineering Papers
Results for “QUASARS”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Disintegration and energy degradation of very high-energy cosmic rays in intense photon fields
Very high energy cosmic rays disintegration and energy degradation by intense blue shifted photon fields of supernovae quasars and pulsar models
Pollack, J. B.↗
Primordial cosmic ray sources
Primordial cosmic ray sources evidence suggesting galaxies and quasars in initial stages of formation
Stecker, F. W.↗
Collective bremsstrahlung from relativistic electrons as a possible mechanism in radio sources
Astrophysical plasmas radio emission interpreted as collective bremsstrahlung due to ultrarelativistic electron tails, discussing Crab Nebula, quasars and Jupiter
Lerche, I.↗
On absorption lines in quasi-stellar objects
Quasar spectra searched for intergalactic absorption lines, discussing red shift
Burbidge, E. M.↗
Further spectroscopic observations of quasi- stellar objects and radio galaxies
Quasar and radio galaxies, observing absorptions at red shifts close to emission line
Burbidge, E. M.↗
Photoelectric spectrophotometry of 4C 05.34
Quasar 4C 05.34 absolute spectral energy distribution by multichannel photoelectric spectrometry
Oke, J. B.↗
On the expanding envelopes of the quasi-stellar objects PHL 5200 and RS 23
Quasars PHL 5200 and RS 23 spectra absorption lines, examining resonance line transfer of radiation through differentially expanding atmosphere
Caroff, L. J.↗
Quarterly report of the Haystack Observatory, 1 January - 31 March 1971
Radar astronomy observations on quasars, lunar craters, and Venus topography
Source record↗
Concerning the primordial abundance of helium in quasi-stellar sources
Quasars primordial He abundance, discussing relation to galactic evolution
Silk, J.↗
Some inferences from spectrophotometry of quasi-stellar sources
Quasars spectrophotometry data, obtaining physical conditions, abundances and electron temperature
Bahcall, J. N.↗
Models for the stabilization of clusters of galaxies by hot gas consistent with observations of PKS 1116 plus 12
Ionized gas galactic cluster stabilization model construction, considering ionizing radiation enhanced cosmic flux and quasar PKS 1116 plus 12 absorption spectrum
Noerdlinger, P. D.↗
Relative correlation of large- and small- redshift quasi-stellar objects with clusters of galaxies
Large and small red shift quasars relative probability correlation with cataloged galaxies clusters direction
Bahcall, J. N.↗
Rapidly changing radio images
Kinematic illusions in connection with retardation effects involving extragalactic sources with varying microwave output, noting occurrence in quasar 3C 279
Cavaliere, A.↗
On the absorption of gamma rays by photons in pulsars, quasi-stellar objects, and other source objects
Quasar and pulsar gamma ray absorption by critical energy collisions with low energy photons
Guthrie, P. D.↗
The cosmic helium abundance
Cosmic helium abundance was studied through the interior structure of young stars, profiles of helium absorption lines in the photospheric spectra of hot young stars, and emission-line spectrum of ionized gas. It is concluded that helium occurred before galaxies were formed. Inconsistencies found in the quasar spectra are briefly mentioned.
Searle, L.↗
Recent developments and applications of the SEC vidicon for astronomy
The engineering development of the SEC vidicon as an astronomical sensor has continued in parallel with its operational use. One scientific application was the six hour exposure of the quasar PHL-957 at the Coude spectrograph of the 200-inch Hale telescope. The developmental effort includes both the enhancement of the basic attributes that make the SEC an appropriate sensor, namely, high quantum efficiency, low threshold, and long integration; as well as work to broaden its scientific usefulness, such as the development of a MgF2 photocathode window for vacuum ultraviolet sensitivity, and a permanent magnet focus design for thermal compatibility with proposed large space telescopes. Additional details on the characteristics of the SEC tube are discussed, as well as plans to make a larger and higher resolution version.
Zucchino, P.↗
Optical spectra of compact objects.
On the basis of their optical spectra, compact objects are divided into three classes: (1) nonthermal objects including Seyfert nuclei, most N-type radio galaxies, and luminous Zwicky objects; (2) hot massive stars, and (3) stellar objects including some compact galaxies having only absorption line spectra. A variety of morphological forms exist among class (1) and (2) objects. Emission line spectra of quasars are reviewed and related to the physical conditions in the emitting regions.
Burbidge, E. M.↗