2010MNRAS.409...48R

Query : 2010MNRAS.409...48R

2010MNRAS.409...48R - Mon. Not. R. Astron. Soc., 409, 48-65 (2010/November-3)

The Herschel multi-tiered extragalactic survey: source extraction and cross-identifications in confusion-dominated SPIRE images.

ROSEBOOM I.G., OLIVER S.J., KUNZ M., ALTIERI B., AMBLARD A., ARUMUGAM V., AULD R., AUSSEL H., BABBEDGE T., BETHERMIN M., BLAIN A., BOCK J., BOSELLI A., BRISBIN D., BUAT V., BURGARELLA D., CASTRO-RODRIGUEZ N., CAVA A., CHANIAL P., CHAPIN E., CLEMENTS D.L., CONLEY A., CONVERSI L., COORAY A., DOWELL C.D., DWEK E., DYE S., EALES S., ELBAZ D., FARRAH D., FOX M., FRANCESCHINI A., GEAR W., GLENN J., GONZALEZ SOLARES E.A., GRIFFIN M., HALPERN M., HARWIT M., HATZIMINAOGLOU E., HUANG J., IBAR E., ISAAK K., IVISON R.J., LAGACHE G., LEVENSON L., LU N., MADDEN S., MAFFEI B., MAINETTI G., MARCHETTI L., MARSDEN G., MORTIER A.M.J., NGUYEN H.T., O'HALLORAN B., OMONT A., PAGE M.J., PANUZZO P., PAPAGEORGIOU A., PATEL H., PEARSON C.P., PEREZ-FOURNON I., POHLEN M., RAWLINGS J.I., RAYMOND G., RIGOPOULOU D., RIZZO D., ROWAN-ROBINSON M., SANCHEZ PORTAL M., SCHULZ B., SCOTT D., SEYMOUR N., SHUPE D.L., SMITH A.J., STEVENS J.A., SYMEONIDIS M., TRICHAS M., TUGWELL K.E., VACCARI M., VALTCHANOV I., VIEIRA J.D., VIGROUX L., WANG L., WARD R., WRIGHT G., XU C.K. and ZEMCOV M.

Abstract (from CDS):

We present the cross-identification and source photometry techniques used to process Herschel SPIRE imaging taken as part of the Herschel Multi-Tiered Extragalactic Survey (HerMES). Cross-identifications are performed in map-space so as to minimize source-blending effects. We make use of a combination of linear inversion and model selection techniques to produce reliable cross-identification catalogues based on Spitzer MIPS 24-µm source positions. Testing on simulations and real Herschel observations shows that this approach gives robust results for even the faintest sources (S250∼ 10 mJy). We apply our new technique to HerMES SPIRE observations taken as part of the science demonstration phase of Herschel. For our real SPIRE observations, we show that, for bright unconfused sources, our flux density estimates are in good agreement with those produced via more traditional point source detection methods (SUSSEXtractor) by Smith et al. When compared to the measured number density of sources in the SPIRE bands, we show that our method allows the recovery of a larger fraction of faint sources than these traditional methods. However, this completeness is heavily dependent on the relative depth of the existing 24-µm catalogues and SPIRE imaging. Using our deepest multiwavelength data set in the GOODS-N, we estimate that the use of shallow 24-µm catalogues in our other fields introduces an incompleteness at faint levels of between 20-40 per cent at 250µm.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): methods: statistical - galaxies: statistics - infrared: galaxies

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 910 0
3 NAME Lockman Hole North reg 10 46.0 +59 01           ~ 29 0
4 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
5 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1364 1
6 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1

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