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Downtime
STScI will be performing network upgrades on the following dates:
  • Sat 24 Apr 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sat 1 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sun 2 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
  • Sat 1 May 2021, time TBD
  • Sun 2 May 2021, time TBD
Services may be unavailable or interrupted during these times.

MAST Composite Quasar Spectrum

HST/FOS Composite Quasar Spectrum

This is a mean quasar spectrum, between 350 and 3000 Å, constructed from 284 FOS observations of 101 quasars with redshifts z > 0.33, as described in Zheng, W., et al. 1997. This reduced archival data is made available courtesy of Dr. Wei Zheng.

The spectrum is available as a flat ASCII file:

The table columns are:

  • Rest wavelength (Å)
  • Relative flux F(lambda)
  • Error
  • RMS

FUSE Composite Quasar Spectrum

This is a mean quasar spectrum from 630 Å to 1156 Å, constructed from 128 FUSE observations of 85 AGNs with redshifts z < 0.67, as described in Scott et al. 2004 in the 1 Nov 2004 issue of The Astrophysical Journal.

The spectrum is available as an ASCII file ( 22 kbytes).

The table columns are:

  • Rest wavelength (Å)
  • Relative flux F(lambda)
  • Error
  • RMS