NOAO >   Observing Info >   Approved Programs >   2015A-0232

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Program Information for 2015A-0232


PI: Sarah-Louise Blyth, University of Cape Town, sarblyth@ast.uct.ac.za
Address: Astronomy Department, Private Bag X3, Rondebosch, Cape Town, Western Cape 7701 South Africa

CoI: David Gilbank, SAAO

Title: How Important is the Cosmic Web in Driving Galaxy Evolution?

Abstract: In the hierarchical picture of structure formation, larger systems (i.e. clusters and groups) are built up from the merger and accretion of smaller units (like galaxies). This accretion occurs in a larger filamentary network, the ``Cosmic Web". Until recently filaments have been largely neglected observationally due to the difficulty of observing them - the density contrast above the background galaxy distribution is much lower than that of either clusters or groups. Nevertheless, they are a key site of galaxy evolution; as star-forming galaxies drain down filaments and are accreted into groups and clusters, their star-formation is quenched by unknown mechanisms. Using a statistical sample of Large Scale Structures (LSSs) we identified in the Sloan Digital Sky Survey (SDSS), we aim to study in detail the properties of galaxies in key locations in the Cosmic Web. For this project we target 2 regions rich in connecting filaments and infalling groups for spectroscopic follow-up with WIYN/HYDRA. This spectroscopy will enable us to trace the membership of the galaxies and will allow improved measurements of their star-formation rates and stellar masses.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2015A):  WIYN/HYDR -- 3n on May 11 - May 13 2015


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2015A-0232

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