Bibcode
Afonso-Luis, A.; Rowan-Robinson, M.; Pérez-Fournon, I.; Mortlock, D. J.; Vaccari, M.; Clements, D. L.; Patel, H.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 428, Issue 1, p.291-306
Fecha de publicación:
1
2013
Número de citas
28
Número de citas referidas
27
Descripción
We present new observational determination of the evolution of the
rest-frame 70 and 160 μm and total infrared (TIR) galaxy luminosity
functions (LFs) using 70 and 160 μm data from the Spitzer Wide-area
Infrared Extragalactic (SWIRE) Legacy survey. The LFs were constructed
for sources with spectroscopic redshifts only in the XMM-LSS and Lockman
Hole fields from the SWIRE photometric redshift catalogue. The 70 μm
and TIR LFs were constructed in the redshift range 0 < z < 1.2 and
the 160 μm LF was constructed in the redshift range 0 < z < 0.5
using a parametric Bayesian and the 1/Vmax methods. We assume
in our models that the faint-end power-law index of the LF does not
evolve with redshift. We find that the double power-law model is a
better representation of the infrared (IR) LF than the more commonly
used power-law and Gaussian model. We model the evolution of the far-IR
LFs as a function of redshift where the characteristic luminosity L*
evolve as ∝ (1+z)^{α _L}. The rest-frame 70 μm LF shows a
strong luminosity evolution out to z = 1.2 with α
_L=3.41^{+0.18}_{-0.25}. The rest-frame 160 μm LF also showed rapid
luminosity evolution with α _L=5.53^{+0.28}_{-0.23} out to z =
0.5. The rate of evolution in luminosity is consistent with values
estimated from previous studies using data from IRAS, ISO and Spitzer.
The TIR LF evolves in luminosity with α _L=3.82^{+0.28}_{-0.16}
which is in agreement with previous results from Spitzer 24 μm which
find strong luminosity evolution. By integrating the LF we calculated
the comoving IR luminosity density out to z = 1.2, which confirms the
rapid evolution in number density of luminous IR galaxies which
contribute ˜ 68+ 10- 07 per cent to the
comoving star formation rate density at z = 1.2. Our results based on 70
μm data confirm that the bulk of the star formation at z = 1 takes
place in dust-obscured objects.
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Ismael
Pérez Fournon