Ultraviolet observations of 3C 273 by the ANS

Details Ultraviolet observations of 3C 273 by the ANS Ultraviolet observations of 3C 273 by the ANS

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l.117w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Nov. 1, 1977, p. L117-L120. Research sponsored by the Koninklij

Astronomy and Astrophysics

Astronomy

37

Astronomical Netherlands Satellite, Astronomical Spectroscopy, Quasars, Ultraviolet Astronomy, Absorption Spectra, Emission Spectra, H Beta Line, Lyman Alpha Radiation, Spaceborne Astronomy

Scientific paper

Five-band spectrophotometry between rest wavelengths of 1340 A and 2850 A is presented. The 2200-A absorption feature seems to be present in 3C 273 with a depth appropriate for an internal reddening of E(B-V) = 0.13. The dereddened ultraviolet flux distribution can be described by a power law of spectral index 1.21. This power law can account for the observed flux in X-rays. It provides more photons than needed to excite the observed H-beta by photoionization and Fe II lines by resonance fluorescence. The emission-line flux ratios, Ly-alpha/C IV/ semiforbidden C III/H-beta are 100/80/60/10.

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