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We present a method for selecting z > 4 dusty, star forming galaxies (DSFGs) using Herschel/SPIRE 250/350/500 µm flux densities to search for red sources. We apply this method to 21 deg 2 of data from the HerMES survey to produce a catalog of 38 high-z candidates. Follow-up of the first 5 of these sources confirms that this method is efficient at selecting high-z DSFGs, with 4/5 at z = 4.3 to 6.3 (and the remaining source at z = 3.4), and that they are some of the most luminous dusty sources known. Comparison with previous DSFG samples, mostly selected at longer wavelengths (e.g., 850 µm) and in single-band surveys, shows that our method is much more efficient at selecting high-z DSFGs, in the sense that a much larger fraction are at z > 3. Correcting for the selection completeness and purity, we find that the number of bright (S 500µm ≥ 30 mJy), red Herschel sources is 3.3 ± 0.8 deg −2 . This is much higher than the number predicted by current models, suggesting that the DSFG population extends to higher redshifts than previously believed. If the shape of the luminosity function for high-z DSFGs is similar to that at z ∼ 2, rest-frame UV based studies may be missing a significant component of the star formation density at z = 4 to 6, even after correction for extinction.

We present the first set of maps and band-merged catalog from the Herschel Stripe 82 Survey (HerS). Observations at 250, 350, and 500 µm were taken with the Spectral and Photometric Imaging Receiver (SPIRE) instrument aboard the Herschel Space Observatory. HerS covers 79 deg 2 along the SDSS Stripe 82 to an average depth of 13.0, 12.9, and 14.8 mJy beam −1 (including confusion) at 250, 350, and 500 µm, respectively. HerS was designed to measure correlations with external tracers of the dark matter density field -either point-like (i.e., galaxies selected from radio to X-ray) or extended (i.e., clusters and gravitational lensing) -in order to measure the bias and redshift distribution of intensities of infrared-emitting dusty star-forming galaxies and AGN. By locating HeRS in Stripe 82, we maximize the overlap with available and upcoming cosmological surveys. The band-merged catalog contains 3.3 × 10 4 sources detected at a significance of > ∼ 3σ (including confusion noise). The maps and catalog are available at

Selecting sources with rising flux densities towards longer wavelengths from Herschel /SPIRE maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, but the previously available catalogues made this way are limited by small survey areas. Here we apply a mapbased search method to 274 deg 2 of the HerMES Large Mode Survey (HeLMS) and create a catalogue of 477 objects with SPIRE flux densities S 500 > S 350 > S 250 and a 5 σ cut-off S 500 > 52 mJy. From this catalogue we determine that the total number of these "red" sources is at least an order of magnitude higher than predicted by galaxy evolution models. These results are in agreement with previous findings in smaller HerMES fields; however, due to our significantly larger sample size we are also able to investigate the shape of the red source counts for the first time. We have obtained spectroscopic redshift measurements for two of our sources using the Atacama Large Millimeter/submillimeter Array (ALMA). The redshifts z = 5.1 and z = 3.8 confirm that with our selection method we can indeed find high-redshift dusty star-forming galaxies.

We investigate the multi-wavelength properties of a sample of 450-µm selected sources from the SCUBA-2 Cosmology Legacy Survey (S2CLS). A total of 69 sources were identified above 4σ in deep SCUBA-2 450-µm observations overlapping the UDS and COSMOS fields and covering 210 arcmin 2 to a typical depth of σ 450 = 1.5 mJy. Reliable cross identification are found for 58 sources (84 per cent) in Spitzer and Hubble Space Telescope WFC3/IR data. The photometric redshift distribution (dN/dz) of 450 µm-selected sources is presented, showing a broad peak in the redshift range 1 < z < 3, and a median of z = 1.4. Combining the SCUBA-2 photometry with Herschel SPIRE data from HerMES, the submm spectral energy distribution (SED) is examined via the use of modified blackbody fits, yielding aggregate values for the IR luminosity, dust temperature and emissivity of L IR = 10 12±0.8 L ⊙ , T D = 42 ± 11 K and β D = 1.6 ± 0.5, respectively. The relationship between these SED parameters and the physical properties of galaxies is investigated, revealing correlations between T D and L IR and between β D and both stellar mass and effective radius. The connection between star formation rate and stellar mass is explored, with 24 per cent of 450 µm sources found to be "star-bursts", i.e. displaying anomalously high specific SFRs. However, both the number density and observed properties of these "star-burst" galaxies are found consistent with the population of normal star-forming galaxies. c 2013 RAS 2 I.G. Roseboom et al.