Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.346..885s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 346, Issue 3, pp. 885-889.
Astronomy and Astrophysics
Astronomy
12
Ism: Individual: Crab Nebula, Supernova Remnants
Scientific paper
A flux-calibrated optical spectrum integrated over the entire Crab nebula was obtained by making drift scans with a long-slit spectrograph. Compared to observations obtained over the past 40 years, these new data confirm an earlier controversial result that the [O III]λλ4959, 5007 equivalent width is increasing with time, although the rate of ~0.9 per cent yr-1 is somewhat slower than that measured previously. Additionally, the Hβ equivalent width is increasing at a comparable rate, but the measured fluxes of both Hβ and [OIII] have changed less than their respective equivalent widths. The different rates of change in the measured fluxes and equivalent widths of these lines suggest that the optical synchrotron continuum from the Crab nebula is indeed fading rapidly. The apparent decline is consistent with a rate around -0.5 (+/-0.2) per cent yr-1 at wavelengths near 5000 Å inferred independently from measurements of the optical continuum flux during the same time period.
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