Bibcode
Chapman, S. C.; Ivison, R. J.; Roseboom, I. G.; Auld, R.; Bock, J.; Brisbin, D.; Burgarella, D.; Chanial, P.; Clements, D. L.; Cooray, A.; Eales, S.; Franceschini, A.; Giovannoli, E.; Glenn, J.; Griffin, M.; Mortier, A. M. J.; Oliver, S. J.; Omont, A.; Page, M. J.; Papageorgiou, A.; Pearson, C. P.; Pérez-Fournon, I.; Pohlen, M.; Rawlings, J. I.; Raymond, G.; Rodighiero, G.; Rowan-Robinson, M.; Scott, Douglas; Seymour, N.; Smith, A. J.; Symeonidis, M.; Tugwell, K. E.; Vaccari, M.; Vieira, J. D.; Vigroux, L.; Wang, L.; Wright, G.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society: Letters, Volume 409, Issue 1, pp. L13-L18.
Fecha de publicación:
11
2010
Número de citas
57
Número de citas referidas
56
Descripción
We present the first study of the far-infrared (FIR) properties of
high-redshift, radio-selected ultraluminous infrared galaxies (ULIRGs)
using deep observations obtained with the Spectral and Photometric
Imaging Receiver (SPIRE) from the Herschel Multi-tiered Extragalactic
Survey (HerMES). These galaxies span a large range of 850-μm fluxes
from submillimetre-luminous ~10mJy sources (SCUBA galaxies) to ~1.5mJy
from stacked SCUBA non-detections, thus likely representing a complete
distribution of ULIRG spectral energy distributions (SEDs). From Keck
spectroscopic surveys in the Lockman-North field we identified a sample
of 31 submillimetre galaxies (SMGs) and 37 submillimetre-faint,
optically faint radio galaxies (OFRGs), all with radio-inferred IR
luminosities >1012 Lsolar. These galaxies were
cross-identified with SPIRE 250-, 350- and 500-μm catalogues based on
fluxes extracted at 24-μm positions in the SWIRE survey, yielding a
sample of more than half of the galaxies well detected in at least two
of the SPIRE bandpasses. By fitting greybody dust models to the SPIRE
photometry together with SCUBA 850-μm measurements (for OFRGs, only
850- upper limits), we infer dust temperatures and FIR luminosities. The
OFRGs detected by SPIRE have median = 41 +/- 5K
and the SMGs have = 34 +/- 5K, both in reasonable
agreement with previous (pre-Herschel) estimates, reaffirming that the
local FIR/radio correlation holds (at least for this subset of high-z
ULIRGs) at high redshift (we measure = 2.43 +/-
0.21 using SIR derived from greybody fit coupled with a
power-law extrapolation to the 24 μm). Our observations first confirm
that a substantial fraction of OFRGs exhibits large infrared
luminosities corresponding to SFRs of
~400Msolaryr-1. The SPIRE observations secondly
confirm the higher dust temperatures for these OFRGs than similarly
selected SMGs, consistent with early predictions of the
submillimetre-faint radio populations. Our observations also clearly
confirm the large infrared luminosities of most SMGs selected with
S850μm > 5mJy and radio and strong 24-μm detections,
corresponding to SFRs of ~700Msolaryr-1.
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Ismael
Pérez Fournon