Submillimeter Galaxy Number Counts in a Semi-analytic Model: the "Count Matching" Approach

MUÑOZ ARANCIBIA, ALEJANDRA M.; NAVARRETE, FELIPE; PADILLA, NELSON D.; CORA, SOFÍA ALEJANDRA; GAWISER, ERIC; KURCZYNSKI, PETER L.; RUIZ, ANDRÉS NICOLÁS

Florianopolis

Congreso; XIV Latin American Regional IAU Meeting; 2013

Recent interferometric observations of the Extended Chandra Deep Field South show that the brightest sub-millimeter galaxies (SMGs) detected by single-dish telescopes are comprised by emission from multiple fainter sources. With the aim of exploring the properties of SMGs, and in analogy to the now-standard abundance matching approach, we perform a ?Count Matching? approach through light-cones drawn from a semi-analytic model. We choose various physical galaxy properties given by the model as proxies for their sub-millimeter fluxes, assuming a monotonic relationship so that the combined LABOCA plus bright-end ALMA observed number counts are reproduced. After turning the catalogs ofgalaxy positions and fluxes given by the different proxies into sub-millimeter maps, we perform a source extraction. With this we study the effects of the observational process in the recovered counts, as well as the galaxy properties derived from the de- tected sources for each proxy. Comparing the recovered redshift, stellar mass and host halo mass distributions with observational data, the best proxy can be found.