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Stacking UV-selected Lyman-Break Galaxies in the ALMA Frontier Fields

Rodrigo A. Carvajal Pizarro
IA/FCUL

Abstract
The Hubble Frontier Fields offer an exceptionally deep window into the high-redshift universe; covering a substantially larger area than the Hubble Ultra-Deep (each field around 2x2 arcmin^2) field at low magnification and probing ~1–2 mags deeper in high magnification regions. This unique parameter space, coupled with the exceptional multi-wavelength ancillary data, can allow useful insights into distant galaxy populations. We leveraged ALMA band 6 (≈263 GHz) mosaics in the central portions of five Frontier Fields to characterize the infrared (IR) properties of UV-seected Lyman-Break Galaxies (LBGs) at redshifts of z~2-8. We investigated individual and stacked fluxes and IR excess (IRX) values of the LBG sample as functions of stellar mass (M_star), redshift, UV luminosity and slope (beta). I will show our detections and upper limits in the context of the IRX-M_star and IRX-beta relations, which probe at least one dex lower in stellar mass than past studies. A handful of cases also create mild tension with the typically assumed attenuation and consensus relations. I will also present a smooth trend between M_star and beta, which extends to low masses and blue (low) beta values, consistent with expectations from previous works.

2020 July 08, 15:00

IA
Online broadcast (Zoom)

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia