------------------------- SPIRE CATALOGUE CREATION ------------------------- This catalogue contains all SPIRE sources which are >5 sigma significance (including confusion noise) in any of the three SPIRE bands (250,350,500um). The source catalogue is based on finding peaks in the noise-weighted PSF filtered the maps using the MADX algorithm. Please refer to Rigby et al. (2010) and Maddox et al. (2010) for details of the source extraction method. The SDP catalogue uses the 250 micron map to perform the source detection. The flux in each band is then estimated as the flux from the noise-weighted psf filtered map at the same position in each band. Apertures fluxes are included where the identification in the optical suggested the source would be resolved by Herschel. 'P_250' etc columns are the point source fluxes from MADX 'BEST' flux columns use the larger of the aperture or point source fluxes and are the ones we consider the most reliable estimate of the flux for a source. We have used the PSF filtered map to detect sources and measure fluxes, close pairs of sub-mm sources will be blended together. We have not yet attempted to deblend SPIRE sources. Flux boosting from Malmquist and Eddington bias and source confusion is present for sources near the limits in the 350 and 500 bands. Please see Rigby et al. 2010 for details and averaged correction values. This catalogue is NOT CORRECTED for flux boosting. For S/N = 5 at 250um, the one sigma positional accuracy was found to be 2.4 arcseconds, reducing to 1.2 arcseconds at 10 sigma (Smith et al. 2010). We have set a floor of 1 arcseconds for the positional accuracy of the highest S/N sources as we expect this is the limit of systematics in the maps. The maps are deep enough that confusion noise is an important factor that must be included in any error estimates. We have estimated the confusion noise in the psf filtered maps to be 5.3, 6.4 and 6.7 mJy/beam (Pascale et al. 2010/Rigby et al. 2010). The noise on each flux in the catalogue is the sum in quadrature of the instrumental noise and confusion noise (see Rigby et al. 2010) A 15% calibration uncertainty should be added in quadrature to all SPIRE fluxes in this catalogue. ---------------------- SPIRE APERTURE FLUXES ---------------------- Fluxes were replaced at 250 and 350 microns for those sources which had reliabilty > 0.8 (see Smith et al. 2010) and an optical size > 0.5*FWHM (where FWHM = 17.98", 24.82" or 35.15" for 250, 350 or 500 microns respectively) in the matched catalogue. For sources with more than one possible match, only the most reliable was considered. Aperture fluxes were measured from the background-subtracted maps made by MADX, using the AUTOPHOTOM tool in gaia. The aperture radius, a_r, used for each source was: a_r = sqrt(FWHM^2.0 + s_opt^2.0) (1) where s_opt is the optical size, taken from the matched catalogue (all apertures were cicular). The apertures were placed at the MAD-X extracted positions; no centroiding was done within AUTOPHOTOM. 1 sigma errors for these fluxes were calculated by summing the variances in the same apertures on the variance maps and then square rooting. Confusion noise estimates were then added in quadrature for each band. Conversion from Jy/beam to Jy/pixel was done by dividing by the beam area - 13.885, 6.607 or 14.225 for 250, 350 or 500 microns respectively. ------------ PACS FLUXES ------------ PACS fluxes are measured using circular apertures placed at the SPIRE positions. The sky background is removed globally at 160 microns by subtracting a background determined within 10x10 pixel blocks. However, at 100 microns this global approach was found to introduce negative holes around bright sources so the background value is determined for each source individually using a local annulus. Two sets of aperture radii are used: firstly a `point source' flux is found using 10 and 15 arcsec radii apertures at 100 and 160 microns respectively. Next, additional aperture fluxes are found for positions where a PACS source would satisfy the extended source criteria discussed above. Aperture radii in this case are calculated using Equation 1, assuming FWHM of 8.7 arcsec and 13.1 arcsec for 100 and 160 microns respectively. A PACS source in either band is only included in the catalogue if it is detected at a level of 5 sigma or greater. Fluxes have been aperture corrected as advised in the PACS map release information: ATLAS-DR Report #5. The scaling calibration factors of 1/1.09 and 1/1.29 at 100 and 160um were applied to the maps and are included in this catalogue. See Ibar et al. 2010 and Rigby et al. 2010 for details on noise and aperture corrections A 10% and 20% calibration uncertainty should be added in quadrature to the PACS 100 and 160um fluxes in this catalogue. ---------------------------- SPIRE 250um source cross-IDS ---------------------------- This catalogue contains ancilliary data from UV-infrared for sources with a reliable (R>0.8) ID from Smith et al. 2010. The ancilliary data come from: GAMA H-ATLAS SDP data of August 2010 (see www.gama-survey.org) SDSS DR7 model r magnitudes over the HATLAS 9hr SV region and spectroscopic redshifts (Abazajian et al. 2009) IIFSCz IRAS catalogue (with updated matching as per Smith et al., 2010) (Wang & Rowan-Robinson 2009) Photometric redshifts using ANNz (see Smith et al. 2010 for details) Sources in the SPIRE catalogue with SN>=5 at 250 microns and r-band SDSS sources were matched using a 10" search radius, and a likelihood ratio analysis performed (see e.g. Sutherland & Saunders 1992, Ciliegi et al., 2003) on all sources in the SDSS catalogue brighter than r = 22.4 model magnitude. Where the reliability of the match is >= 80% we have included the ID of the counterpart and the FUV-K photometry, photo-z and spec-z where available. Please acknowledge the sources of this information in any publications (eg. SDSS or GAMA). The z_spec column is based mostly on the GAMA 9 hour field redshifts including those from year 2 & 3 of the GAMA survey (Driver et al., 2010), and include SDSS, 2SLAQ QSO/LRG and 6dFGS survey catalogues. The sources of the redshifts by catalogue are defined in the ZFLAG column, in which the values are the sum of the following depending on the sources of the redshifts: SDSS - 1 6dFGS - 2 2SLAQ-QSO - 4 2SLAQ-LRG - 8 GAMA - 16 Only spectroscopic redshifts with Z_QUAL >= 3.0 should be considered reliable. The catalogue also includes star-galaxy separation determined according to a modified version of the method in Baldry et al., (2010), and the results are shown in the SGSEP column of the fits table. SGSEP = 0 indicates a resolved source, while SGSEP = 1 indicates unresolved sources. The likelihood ratios and reliabilities are calculated separately for the resolved and unresolved sources, as discussed in Smith et al., 2010. GAMA photometry has been corrected for galactic extinction and the photometric errors include the additional factor of 4 estimated in the GAMA photometry paper (Hill et al. 2010). Otherwise the GAMA photometry is as released to us and has not been checked, please consult www.gama-survey.org for detailed information about the GAMA catalogue. Null values are indicated in this catalogue by the value -99.0. 27/10/2010 On behalf of the HATLAS team