Stacking of Interferometric Data: New Tools for Stacking of ALMA Data

Knudsen, Kirsten Kraiberg,1976Chalmers tekniska högskola,Chalmers University of Technology (författare)

Radio and mm observations play an important role in determining the star formation properties of high-redshift galaxies. With the unprecedented sensitivity, ALMA now enable studies of faint, distant star-forming galaxies. However, most galaxies with low star formation rates at high redshift are too faint to be detected individually at these wavelengths. A way to study such galaxies is to use stacking. By averaging the emission of a large number of galaxies detected in optical or near-infrared surveys, we can achieve statistical detection. We investigate methods for stacking data from interferometric surveys. Interferometry poses unique challenges in stacking due to the nature of this data. We have compared stacking of uv-data with stacking of imaged data, the latter being the commonly used approach. Using simulated data, we find that uv-stacking may provide up to 50% less noise and that image based stacking systematically loses around 10% of the flux. More importantly, we find that the uv-stacking yield more robust results, especially in the case of (marginally) resolved sources and mosaicked data.

Lindroos, Lukas,1986Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lindroos (författare)
Vlemmings, Wouter,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)wouterv (författare)
Conway, John,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jconway (författare)
Marti-Vidal, Ivan,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mivan (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:4th ALMA Science Conference on Revolution in Astronomy with ALMA: The Third Year, Tokyo, Japan, 8-11 December499, s. 81-829781583818831

Av författaren/redakt...: Knudsen, Kirsten ...; Lindroos, Lukas, ...; Vlemmings, Woute ...; Conway, John, 19 ...; Marti-Vidal, Iva ...

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