Scientific Seminars

The Wall: a cosmic lab for environmental quenching at z~0.73

Angela Iovino
INAF-OAB

2016-05-17    14:00    Brera - Auletta strumenti

We have performed deep spectroscopic observations at VIMOS@VLT of a large filamentary structure at z~0.73 in the field of the COSMOS survey, the so-called COSMOS-Wall. This remarkable structure encompasses a comprehensive range of environments: from a dense cluster and galaxy groups to filaments and lower density regions, and we fully mapped it by targeting a K-band selected, mass complete sample down to Mlim ~9.8 Msun, within the narrow redshift bin 0.69-0.79. The final sample in our hands totals ~1300 galaxies, for which we possess exquisite quality spectroscopic information, providing sharp environmental definition and important spectral diagnostics, to be added to the wealth of ancillary photometric information available for the COSMOS field: HST-ACS data complemented by extensive multi-wavelength ground and space-based observations spanning the entire electromagnetic spectrum. We will present the survey and our results, discussing evidence for star formation quenching taking place within the groups environment.