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Titolo:
SIMULTANEOUS MULTIWAVELENGTH SPECTRUM AND VARIABILITY OF 3C-279 FROM 10(9) TO 10(24) HZ
Autore:
HARTMAN RC; WEBB JR; MARSCHER AP; TRAVIS JP; DERMER CD; ALLER HD; ALLER MF; BALONEK TJ; BENNETT K; BLOOM SD; FUJIMOTO R; HERMSEN W; HUGHES P; JENKINS P; KII T; KURFESS JD; MAKINO F; MATTOX JR; VONMONTIGNY C; OHASHI T; ROBSON I; RYAN J; SADUN A; SCHONFELDER V; SMITH AG; TERASRANTA H; TORNIKOSKI M; TURNER MJL;
Indirizzi:
NASA,GODDARD SPACE FLIGHT CTR,CODE 661 GREENBELT MD 20771 FLORIDA INT UNIV,DEPT PHYS MIAMI FL 33199 BOSTON UNIV,DEPT ASTRON BOSTON MA 02215 USN,RES LAB WASHINGTON DC 20375 UNIV MICHIGAN,DEPT ASTRON ANN ARBOR MI 48109 COLGATE UNIV,DEPT PHYS & ASTRON HAMILTON NY 13346 EUROPEAN SPACE AGCY,ESTEC,DIV ASTROPHYS 2200 AG NOORDWIJK NETHERLANDS TECHNION ISRAEL INST TECHNOL,ASHER SPACE RES INST HAIFA ISRAEL INST SPACE & ASTRONAUT SCI SAGAMIHARA KANAGAWA 229 JAPAN SRON 3584 CA UTRECHT NETHERLANDS UNIV MARYLAND,DEPT ASTRON COLLEGE PK MD 20742 TOKYO METROPOLITAN UNIV,DEPT PHYS HACHIOJI TOKYO 19203 JAPAN JCMT HILO HI 96720 UNIV NEW HAMPSHIRE,INST EARTH OCEANS & SPACE DURHAM NH 03824 AGNES SCOTT COLL,BRADLEY OBSERV DECATUR GA 30030 MAX PLANCK INST EXTRATERR PHYS W-8046 GARCHING GERMANY UNIV FLORIDA,DEPT ASTRON GAINESVILLE FL 32611 METSAHOVI RADIO RES STN SF-02540 KYLMALA FINLAND UNIV LEICESTER,DEPT PHYS & ASTRON LEICESTER LE1 7RH LEICS ENGLAND
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 461, anno: 1996,
parte:, 1
pagine: 698 - 712
SICI:
0004-637X(1996)461:2<698:SMSAVO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENERGY GAMMA-RADIATION; EXTRAGALACTIC RADIO-SOURCES; RELATIVISTIC JETS; X-RAY; MULTIFREQUENCY OBSERVATIONS; EGRET DETECTION; QUASAR 3C-279; MILLIMETER; TELESCOPE; EMISSION;
Keywords:
GAMMA RAYS, OBSERVATIONS; INFRARED, GALAXIES; QUASARS, INDIVIDUAL (3C 279); X-RAYS, GALAXIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
69
Recensione:
Indirizzi per estratti:
Citazione:
R.C. Hartman et al., "SIMULTANEOUS MULTIWAVELENGTH SPECTRUM AND VARIABILITY OF 3C-279 FROM 10(9) TO 10(24) HZ", The Astrophysical journal, 461(2), 1996, pp. 698-712

Abstract

Data from a number of monitoring programs have been combined with data from the Compton Gamma Ray Observatory and the Ginga X-ray satelliteto construct a spectrum covering nearly 15 decades in frequency during or near the time of the 3C 279 gamma-ray flare observed by EGRET in 1991 June. A much less complete spectrum is presented for 1991 October. Light curves from early 1991 to mid-1992 are presented for radio, millimeter, submillimeter, infrared, optical, and gamma-rays. Although the temporal coverage is incomplete, the only evidence for correlation in variability between the gamma-rays and lower frequencies is a flarein the optical R-band that peaks within similar to 1 day of the maximum in the gamma-ray light curve. The variability shows higher relativeamplitude in gamma-rays than in the R band. We present spectral fits to the overall multi-wave band spectrum averaged over the 1991 June flare corresponding to two models: (i) synchrotron self-Compton (SSC) emission from a relativistic jet and (ii) inverse Compton scattering of seed photons originating external to the jet (ECS) by the synchrotron-emitting relativistic electrons in the jet. Either model can fit the observed spectra satisfactorily. The higher amplitude of the gamma-ray variations is as predicted by the SSC model and can be accommodated within the ECS model if the flare is caused by a temporary change in thebulk Lorentz factor of the gamma-ray-emitting plasma.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 11:07:13