Dust properties of Lyman break galaxies at $z\sim3$
| Autor: | C. E. López-Fortín, Asantha Cooray, Joaquin Vieira, Anton M. Koekemoer, G. Rodighiero, Peter Hurley, B. Lo Faro, V. Buat, Sebastien Heinis, Lingyu Wang, Mara Salvato, Matthieu Béthermin, Douglas Scott, J. Alvarez-Marquez, Yoshiaki Taniguchi, Edo Ibar, Duncan Farrah, Ismael Perez-Fournon, Brian C. Lemaux, Denis Burgarella, O. Ilbert |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Stellar mass
Infrared Continuum (design consultancy) FOS: Physical sciences Context (language use) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Luminosity Galaxies: high-redshift Galaxies: starburst Infrared: galaxies Submillimeter: galaxies Ultraviolet: galaxies Astronomy and Astrophysics Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics Luminous infrared galaxy 010308 nuclear & particles physics Star formation Astrophysics - Astrophysics of Galaxies Galaxy Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Popis: | We explore from a statistical point of view the far-infrared (far-IR) and sub-millimeter (sub-mm) properties of a large sample of LBGs (22,000) at z~3 in the COSMOS field. The large number of galaxies allows us to split it in several bins as a function of UV luminosity, UV slope, and stellar mass to better sample their variety. We perform stacking analysis in PACS (100 and 160 um), SPIRE (250, 350 and 500 um) and AzTEC (1.1 mm) images. Our stacking procedure corrects the biases induced by galaxy clustering and incompleteness of our input catalogue in dense regions. We obtain the full IR spectral energy distributions (SED) of subsamples of LBGs and derive the mean IR luminosity as a function of UV luminosity, UV slope, and stellar mass. The average IRX is roughly constant over the UV luminosity range, with a mean of 7.9 (1.8 mag). However, it is correlated with UV slope, and stellar mass. We investigate using a statistically-controlled stacking analysis as a function of (stellar mass, UV slope) the dispersion of the IRX-UVslope and IRX-M* plane. Our results enable us to study the average relation between star-formation rate (SFR) and stellar mass, and we show that our LBG sample lies on the main sequence of star formation at z~3. Accepted to A&A, 17 Pages, 14 Figures, 2 Tables |
| Databáze: | OpenAIRE |
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