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HELP star : star formation as a function of galaxy environment with Herschel

Abstract : The Herschel Extragalactic Legacy Project (HELP) brings together a vast range of data from many astronomical observatories. Its main focus is on the Herschel data, which maps dust-obscured star formation over 1300 deg(2). With this unprecedented combination of data sets, it is possible to investigate how the star formation versus stellar mass relation (main sequence) of star-forming galaxies depends on environment. In this pilot study, we explore this question within 0.1 \textless z \textless 3.2 using data in the COSMOS field. We estimate the local environment from a smoothed galaxy density field using the full photometric redshift probability distribution. We estimate star formation rates by stacking the SPIRE data from the Herschel Multi-tiered Extragalactic Survey. Our analysis rules out the hypothesis that the main sequence for star-forming systems is independent of environment at 1.5 \textless z \textless 2, while a simple model in which the mean specific star formation rate declines with increasing environmental density gives a better description. However, we cannot exclude a simple hypothesis in which the main sequence for star-forming systems is independent of environment at z \textless 1.5 and z \textgreater 2. We also estimate the evolution of the star formation rate density in the COSMOS field, and our results are consistent with previous measurements at z \textless 1.5 and z \textgreater 2 but we find a 1.4(-0.2)(+0.3) times higher peak value of the star formation rate density at z similar to 1.9.
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Submitted on : Friday, September 10, 2021 - 7:31:18 AM
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S. Duivenvoorden, S. Oliver, V. Buat, B. Darvish, A. Efstathiou, et al.. HELP star : star formation as a function of galaxy environment with Herschel. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (1), pp.277--289. ⟨10.1093/mnras/stw1466⟩. ⟨hal-01440709⟩

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