File:The 304 A He + absorption line in the spectrum of quasar HE 2347-4342 (eso9720c).jpg
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[edit]DescriptionThe 304 A He + absorption line in the spectrum of quasar HE 2347-4342 (eso9720c).jpg |
English: This diagram shows a small part of the far-ultraviolet spectrum of the newly discovered, unusually bright quasar HE 2347-4342 (redshift z = 2.885). It was obtained in June 1996 with the GHRS instrument at the Hubble Space Telescope during a total exposure time of about 6 hours. The abscissa unit is Angstrom (1 A = 10 -10 m); the ordinate is relative intensity (brightness). The spectral resolution is about 0.7 A. The recorded spectrum in this region is indicated with a fully drawn line. As can be seen, the intensity is virtually zero in several areas, for instance in the 1162 - 1172 A and 1176 - 1182 A intervals (`troughs'). This is due to He + -ions in the foreground of the quasar, strongly absorbing the light from the quasar in the redshifted 304 A helium line. Since a particular wavelength corresponds to a particular redshift and therefore to a certain distance along the line of sight, the amount of absorption at a given wavelength is a direct measure of the number of ions at a given distance from the quasar. |
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Date | 1 August 1997 (upload date) | ||
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Author | ESO | ||
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Credit/Provider | ESO |
Source | European Southern Observatory |
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Date and time of data generation | 00:00, 1 August 1997 |
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Contact information |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM version | 4 |