Abstract
New observations at 1.6-3.45 microns confirm the presence of a dramatic (change in spectral index of approximately 1) break between radio-IR wavelengths and 6,000 A in the spectrum of the M87 jet. These data, in combination with data taken in other spectral regions, show that the individual knots in the M87 jet have nearly the same spectral indices and nearly the same large (change in spectral index of approximately 1) spectral break. This large spectral break and the constancy of spectral properties between the knots pose serious constraints for models of the M87 jet.
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