Abstract
There has been some disagreement about the strength of evolution
exhibited by IRAS galaxies. With a parameterisation such that the
co-moving density increases as $(1+z)^P$ measurements of $P$ range from
$2\pm3$ to $6.7\pm2.3$. We have recently completed a deep IRAS redshift
survey which should help to clarify the situation. Paying particular
attention to possible systematic effects (notably Malmquist Bias) we
claim positive detection of evolution within this sample at the
$3\sigma$ level. Our best estimate of the strength of evolution seen in
this survey is $P=5.6\pm1.6\pm0.7$ corresponding to luminosity evolution
$L(z)=L_{z=0}(1+z) ^{3.3\pm0.8\pm0.6}$. This estimate is consistent with
all previous determinations of the rate of cosmological evolution of
IRAS galaxies. Neither this survey nor any previous survey is
sufficiently deep to distinguish between pure luminosity and pure
density evolution nor between different parameterisation of these forms.
Original language | English |
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Title of host publication | Wide Field Spectroscopy and the Distant Universe. Proceedings of the 35th Herstmonceux Conference |
Pages | 274 |
Publication status | Published - 17 Jan 1995 |