Composite Radio-Loud and Radio-Quiet Spectra
Combining radio observations from Francis, Hooper and Impey (1993, AJ 106,
417) with more recent data from the FIRST sample, I've been able to
produce sub-composites for those objects with sensitive radio measurements.
I've separated them on the radio-to-optical ratio. Log(R)>10 is defined as
radio loud.
These composites, unlike the one above, have had the continuum divided out
from the individual spectra before co-addition. A 4th order Chebyshev
polynomial was used. High and low points were iteratively removed. The
code (in FORTRAN) is included below.
NB. BALQSOs were excluded from the radio-quiet composite. Unlike the
combined composite, the individual spectra have not been inverse variance
weighted. This diminishes the quality of the composite spectrum, but ensures
that it is representative. The files contain
the following columns:
- Wavelength
- Continuum normalised flux
- Standard deviation of the individual QSO fluxes going into that bin.
- Number of individual QSO spectra contributing to that bin.
- Average redshift of QSOs contributing to that bin.
- Lowest redshift contributing
- Highest redshift contributing
Last updated 28th October 2002.
Maintainer:
Paul Francis,
