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Cosmic Web and Star Formation Activity in Galaxies at z ~ 1

Darvish, B. and Sobral, D. and Mobasher, B and Scoville, N. Z. and Best, P. and Sales, L. V. and Smail, I. (2014) Cosmic Web and Star Formation Activity in Galaxies at z ~ 1. Astrophysical Journal, 796 (1). Art. No. 51. ISSN 0004-637X. doi:10.1088/0004-637X/796/1/51.

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We investigate the role of the delineated cosmic web/filaments on star formation activity by exploring a sample of 425 narrow-band selected Hα emitters, as well as 2846 color-color selected underlying star-forming galaxies for a large-scale structure at z = 0.84 in the COSMOS field from the HiZELS survey. Using the scale-independent Multi-scale Morphology Filter algorithm, we are able to quantitatively describe the density field and disentangle it into its major components: fields, filaments, and clusters. We show that the observed median star formation rate (SFR), stellar mass, specific SFR, the mean SFR-mass relation, and its scatter for both Hα emitters and underlying star-forming galaxies do not strongly depend on different classes of environment, in agreement with previous studies. However, the fraction of Hα emitters varies with environment and is enhanced in filamentary structures at z ~ 1. We propose mild galaxy-galaxy interactions as the possible physical agent for the elevation of the fraction of Hα star-forming galaxies in filaments. Our results show that filaments are the likely physical environments that are often classed as the "intermediate" densities and that the cosmic web likely plays a major role in galaxy formation and evolution which has so far been poorly investigated.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Darvish, B.0000-0003-4919-9017
Sobral, D.0000-0001-8823-4845
Scoville, N. Z.0000-0002-0438-3323
Smail, I.0000-0003-3037-257X
Additional Information:© 2014 American Astronomical Society. Received 2014 August 27; accepted 2014 September 25; published 2014 November 4. We gratefully thank the referee for thoroughly reading the original manuscript and providing very useful comments that improved the quality of this work. D.S. acknowledges financial support from LKBF, the Netherlands Organisation for Scientific research (NWO) through a Veni fellowship, from FCT through an FCT Investigator Starting Grant, a Start-up Grant (IF/01154/2012/CP0189/CT0010), and the grant PEst-OE/FIS/UI2751/2014. B.D. thanks Miguel Aragόn-Calvo for his useful comments on an earlier draft. I.S. acknowledges support from STFC (ST/L00075X/1), the ERC Advanced Investigator programme DUSTYGAL 321334, and a Royal Society/Wolfson Merit Award.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Fundação para a Ciência e a Tecnologia (FCT)IF/01154/2012/CP0189/CT0010
Fundação para a Ciência e a Tecnologia (FCT)PEst-OE/FIS/UI2751/2014
Science and Technology Facilities Council (STFC)ST/L00075X/1
European Research Council (ERC)DUSTYGAL 321334
Subject Keywords:galaxies: clusters: general; galaxies: evolution; galaxies: star formation; large-scale structure of universe
Issue or Number:1
Record Number:CaltechAUTHORS:20141211-104915111
Persistent URL:
Official Citation:Cosmic Web and Star Formation Activity in Galaxies at z ~ 1 B. Darvish et al. 2014 ApJ 796 51
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52598
Deposited On:11 Dec 2014 21:21
Last Modified:10 Nov 2021 19:43

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