Other
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..550k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 550-554.
Other
14
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Radiation, Plasma Jets, Visual Photometry, Emission Spectra, Galactic Nuclei, Interstellar Gas, Optical Measurement, Spectrophotometry
Scientific paper
Spectrophotometry of the brightest knots in the M87 jet shows a gradual steepening of the spectral index from alpha = 0.66 in the IR to 0.92 over 460-700 nm, rather than the abrupt steepening (Delta alpha = about 1) previously reported. Together with IUE and Einstein data in the literature, this suggests a spectral break of amplitude 0.6 + or - 0.1 near 3000 A and a maximum electron energy in a single power-law distribution near 300 GeV. No emission lines are seen in the jet to an equivalent-width limit of 1.0 A, giving an emission measure below 20 cm(-6) pc. Any ionized gas near the jet, over a very wide range of density, must be hot (1-10 million K). The H-alpha + forbidden N II filament projected nearest the jet shows no anomalies in ionization level compared with other such filaments. Attention is called to the possibility that the nuclear emission lines are powered by photoionization from the active nucleus.
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