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HELP: star formation as a function of galaxy environment withHerschel

Duivenvoorden, S., Oliver, S., Buat, V., Darvish, B., Efstathiou, A., Farrah, D., Griffin, Matthew Joseph ORCID: https://orcid.org/0000-0002-0033-177X, Hurley, P. D., Ibar, E., Jarvis, M., Papadopoulos, A., Sargent, M. T., Scott, D., Scudder, J. M., Symeonidis, M., Vaccari, M., Viero, M. P. and Wang, L. 2016. HELP: star formation as a function of galaxy environment withHerschel. Monthly Notices of the Royal Astronomical Society 462 (1) , pp. 277-289. 10.1093/mnras/stw1466

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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 deg2. 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 < z < 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 < z < 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 < 1.5 and z > 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 < 1.5 and z > 2 but we find a 1.4+0.3−0.21.4−0.2+0.3 times higher peak value of the star formation rate density at z ∼ 1.9.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Funders: European Union
Date of First Compliant Deposit: 1 November 2016
Date of Acceptance: 16 June 2016
Last Modified: 02 May 2023 22:04
URI: https://orca.cardiff.ac.uk/id/eprint/94410

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