HELP: star formation as function of galaxy environmentwith 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 vs stellar mass relation (main-sequence) of star-forming galaxies depends on environment. In this pilot study we explore this question between 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 (HerMES). 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 $1.4_{-0.2}^{+0.3}$ times higher peak value of the star formation rate density at $z\sim 1.9$.

14 pages, 7 figures. MNRAS accepted

References in corpus (21)

• Cosmic Star Formation History
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• Evolution of the dust emission of massive galaxies up to z=4 and constraints on their dominant mode of star formation
• GOODS-HERSCHEL: star formation, dust attenuation and the FIR-radio correlation on the Main Sequence of star-forming galaxies up to z~4
• Photometric redshifts in the SWIRE Survey
• Large Structures and Galaxy Evolution in COSMOS at z < 1.1
• The star-formation rate density from z = 0-6
• A Comparative Study of Density Field Estimation for Galaxies: New Insights into the Evolution of Galaxies with Environment in COSMOS out to z~3
• Cosmic Web and Star Formation Activity in Galaxies at z~1
• Mapping the average AGN accretion rate in the SFR-M* plane for Herschel selected galaxies at 0<z<2.5
• The Cosmic Evolution Survey (COSMOS): a large-scale structure at z=0.73 and the relation of galaxy morphologies to local environment
• The star formation activity in cosmic voids
• The star formation history of galaxies: the role of galaxy mass, morphology and environment
• The environmental impacts on the star formation main sequence: an H-alpha study of the newly discovered rich cluster at z=1.52
• The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey
• On the cosmic evolution of the specific star formation rate
• On the Reversal of SFR-Density Relation at z=1: Insights from Simulations

Cited by in corpus (8)

• The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to $z\sim 5$
• HELP: The Herschel Extragalactic Legacy Project
• Similar Scaling Relations for the Gas Content of Galaxies across Environments to z ~ 3.5
• Environmental Quenching and Galactic Conformity in the Galaxy Cross-Correlation Signal
• Quenching or Bursting: the Role of Stellar Mass, Environment, and Specific Star Formation Rate to $z$ $\sim$ 1
• The role of environment in galaxy evolution in the SERVS Survey I: density maps and cluster candidates
• The nature of H$\alpha$-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey
• The effect of environment on the properties of the most massive galaxies at $0.5<z<2.5$ in the cosmos-dash field