X-ray outburst of the quasar 3C 279

Details X-ray outburst of the quasar 3C 279 X-ray outburst of the quasar 3C 279

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347l...9m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. L9-L12.

Astronomy and Astrophysics

Astronomy

71

Quasars, X Ray Sources, Astronomical Spectroscopy, Gravitational Effects, Hubble Constant, X Ray Spectra

Scientific paper

A large X-ray flare-up of the quasar 3C 279, coinciding with an unusual multifrequency outburst, was detected with X-ray astronomy satellite Ginga. Observations carried out on two occasions indicate that the 2-20 keV flux has increased by a factor of more than 4, from 1.2 to 5.3 micro-Jy at 2 keV, within about a year. During the outburst, the X-ray spectrum became slightly harder than that in the quiet period, the photon index changing from Gamma = 1.70 + or - 0.06 to 1.58 + or -0.03. The X-ray flux varied by 20 percent during the outburst within a period as short as 45 minutes, which indicates Delta L/Delta t greater than 2 x 10 to the 42nd ergs/sq s for H(0) = 100 km/s mpc and q(0) = 0.5, the largest value ever observed for a quasar. The observed Delta L/Delta t suggests that the X-ray-emitting region is moving with a relativistic velocity toward us. These results suggest that a relativistic jet is being formed.

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