The intraday variable quasar 0917+624: VLBI and X-ray observations.

Details The intraday variable quasar 0917+624: VLBI and X-ray observations. The intraday variable quasar 0917+624: VLBI and X-ray observations.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306...27s&link_type=abstract

Astronomy and Astrophysics, v.306, p.27

Astronomy and Astrophysics

Astrophysics

17

Galaxies: Jets, Quasars: Qso 0917+624, X-Rays: Galaxies, Radio Continuum: Galaxies

Scientific paper

We present the first VLBI images of the extremely rapidly variable radio source 0917+624, at frequencies ranging from 2.3 to 22GHz. They reveal a compact core containing ~75% of the total flux density, and a jet extending to the northwest at position angle -20deg. The jet is curved on the sub-milliarcsecond scale, and one of the jet components is elongated perpendicular to the jet direction. This component displays apparent superluminal motion with a speed of β_app_h=7.8+/-0.8 (H_0_=100h.km/s/Mpc; q_0_=0.5). A first detection of X-rays from 0917+624 with the ROSAT satellite enables us to estimate the magnetic field and the Doppler factor from synchrotron self-Compton theory. The observational results are compared with models for the rapid variability. The orientation of the jet on the sky is consistent with a prediction from two-component models that were developed to explain the polarization variations in 0917+624. The physical parameters derived from the new observations can be accomodated both by intrinsic (shock-in-jet or coherent emission) and extrinsic (interstellar scattering) explanations of the variability.

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