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Titolo:
SIMULTANEOUS AND QUASI-SIMULTANEOUS OBSERVATIONS OF THE CONTINUUM EMISSION OF THE QUASAR-3C-273 FROM RADIO TO GAMMA-RAY ENERGIES
Autore:
LICHTI GG; BALONEK T; COURVOISIER TJL; JOHNSON N; MCCONNELL M; MCNAMARA B; VONMONTIGNY C; PACIESAS W; ROBSON EI; SADUN A; SCHALINSKI C; SMITH AG; STAUBERT R; STEPPE H; SWANENBURG BN; TURNER MJL; ULRICH MH; WILLIAMS OR;
Indirizzi:
NASA,GODDARD SPACE FLIGHT CTR GREENBELT MD 20771 MAX PLANCK INST EXTRATERR PHYS D-85748 GARCHING GERMANY COLGATE UNIV,DEPT PHYS & ASTRON HAMILTON NY 13343 OBSERV GENEVA CH-1290 SAUVERNY SWITZERLAND USN,RES LAB WASHINGTON DC 20375 UNIV NEW HAMPSHIRE,INST STUDY EARTH OCEANS & SPACE DURHAM NH 03824 NEW MEXICO STATE UNIV LAS CRUCES NM 88003 UNIV ALABAMA,DEPT PHYS HUNTSVILLE AL 35899 UNIV CENT LANCASHIRE,SCH PHYS & ASTRON PRESTON PR1 2HE LANCS ENGLAND AGNES SCOTT COLL,BRADLEY OBSERV,DEPT PHYS & ASTROPHYS DECATUR GA 30030 INST RADIOASTRON MILLIMETERBEREICH GRENOBLE FRANCE UNIV FLORIDA,DEPT ASTRON GAINESVILLE FL 32611 UNIV TUBINGEN,INST ASTRON D-72076 TUBINGEN GERMANY INST RADIOASTRON MILLIMETERBEREICH E-18012 GRANADA SPAIN LAB SPACE RES LEIDEN 2300 RA LEIDEN NETHERLANDS UNIV LEICESTER,DEPT PHYS LEICESTER LE1 7RH LEICS ENGLAND EUROPEAN SO OBSERV D-85748 GARCHING GERMANY EUROPEAN SPACE AGCY,ESTEC,DEPT SPACE SCI,DIV ASTROPHYS 2200 AG NOORDWIJK NETHERLANDS
Titolo Testata:
Astronomy and astrophysics
fascicolo: 3, volume: 298, anno: 1995,
pagine: 711 - 725
SICI:
0004-6361(1995)298:3<711:SAQOOT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE GALACTIC NUCLEI; X-RAY; RELATIVISTIC JETS; 2-FLOW MODEL; COS-B; H-I; 3C-273; 3C273; VARIABILITY; RADIATION;
Keywords:
GAMMA-RAYS, OBSERVATIONS; QUASARS, INDIVIDUAL (3C 273); INFRARED, GALAXIES; ULTRAVIOLET, GALAXIES; RADIO CONTINUUM, GALAXIES; X-RAYS, GALAXIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
79
Recensione:
Indirizzi per estratti:
Citazione:
G.G. Lichti et al., "SIMULTANEOUS AND QUASI-SIMULTANEOUS OBSERVATIONS OF THE CONTINUUM EMISSION OF THE QUASAR-3C-273 FROM RADIO TO GAMMA-RAY ENERGIES", Astronomy and astrophysics, 298(3), 1995, pp. 711-725

Abstract

From June 15-28, 1991 the Compton Gamma-Ray Observatory (CGRO) observed the radio-loud quasar 3C 273. All four CGRO instruments detected radiation from this quasar in their relevant energy ranges (from 20 keV to 5 GeV). Simultaneous and quasi-simultaneous observations by instruments sensitive at other wavelengths have also been performed. The datafrom all these observations, spanning the frequency range from 5 10(9) Hz to 8.5 . 10(24) Hz, were collected and analysed. Details of the observations and an overall energy-density spectrum are presented. Thisspectrum shows three maxima, one in the infrared (IR), one in the UV and another one at low-energy gamma-rays, the latter two having nearlythe same strength of 3.1 . 10(46) erg/(s frequency decade) and 2.7 . 10(46) erg/(s frequency decade), respectively. At low-energy gamma-rays a break around 1 MeV (= 2.418 . 10(20) Hz) in the energy-density spectrum is evident. The change of the spectral index between X- and gamma-rays is similar to 0.8. The implications of these simultaneous and quasi-simultaneous observations on some theoretical models are discussed.

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Documento generato il 18/09/20 alle ore 09:22:49