StePs. Angela Iovino INAF OABrera On behalf of the StePs team*
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1 StePs Stellar Populations at intermediate redshift survey Angela Iovino INAF OABrera On behalf of the StePs team* * B. Poggianti, A. Iovino, A. Mercurio, L. Pozzetti, A. Gallazzi, M. Bolzonella, S. Zibetti, S. Trager, M. Balcells, I. Ferreras, S. Fritz, J. Gallego, R. Garcia Benito, R. Gonzales- Delgado, J. Iglesia, J. Iglesias Paramo, J. Knapen, L. Morelli, A. Pizzella, S. McGee, P. Sanchez Blazquez, C. Weidner
2 1- WEAVE instrument Overview 2- Science Goals of StePs 3- Survey Planning 4- Latest news and future plans
3 1- WEAVE instrument Overview A powerful new multi-object spectrograph for the 4.2m William Herschel Telescope
4 1- WEAVE instrument Overview Part of strategic planning for the next decade at ING: Wide Field Spectroscopy at a 4mt telescope
5 1- WEAVE instrument Overview New prime focus facility at the WHT that can address the wide-ranging survey goals of Galactic and extra-galactic astronomy using a single competitive and cost-effective instrument, which should begin operations in early New 2degs prime focus corrector with good blue throuput Pick & Place fiber positioner (2dF like) but COTS components
6 1- WEAVE instrument Overview New prime focus facility at the WHT that can address the wide-ranging survey goals of Galactic and extra-galactic astronomy using a single competitive and cost-effective instrument, which should begin operations in early New 2degs prime focus corrector with good blue throuput Dual beam spectrograph with dichroic at 6000Å + 2 holographic gratings
7 1- WEAVE instrument Overview
8
9 Main assets of WEAVE: Good resolution (~1Å/px) over a wide wavelenght range ( Å) Large FoV Excellent multiplexing StePs Stellar Populations at intermediate redshift survey
10 2- StePs science goals StePs Stellar Populations at intermediate redshift survey The processes responsible for galaxy evolution may be studied either probing slices of the Universe at different epochs through redshift surveys or scrutinizing todays galaxies to infer their past mass assembly.
11 2- StePs science goals StePs Stellar Populations at intermediate redshift survey Each galaxy spectrum contains a wealth of information encoded in its shape and absorption/emission features information on galaxy physics, mass assembly history and chemical enrichment history. Credits Lonoce & Longhetti
12 2- StePs science goals StePs Stellar Populations at intermediate redshift survey Surveys such as 2dF and SDSS have made ground-breaking progress in the low-redshift Universe Gallazzi et al. 2005
13 (g-r) 2- StePs science goals StePs Stellar Populations at intermediate redshift survey Surveys such as 2dF and SDSS have made ground-breaking progress in the low-redshift Universe Mr Gallazzi et al Mr
14 2- StePs science goals StePs Stellar Populations at intermediate redshift survey Surveys such as 2dF and SDSS have made ground-breaking progress in the low-redshift Universe Thomas et al. 2010
15 2- StePs science goals As of today similar studies at intermediate redshift have been limited to relatively small samples of galaxies or to co-added spectra Extend to higher redshift and with comparable wealth of data the work done in the local universe. Tracing back in cosmic time the evolution of galaxy stellar population properties as a function of galaxy stellar mass, star formation activity and environment will provide much needed empirical constraints on the physical mechanisms that regulate galaxy formation and assembly history.
16 2- StePs science goals In a nutshell : StePs is a spectral survey of ~ 40K galaxies at magnitude brighter than I AB =20.5 and pre-selected from photometric redshifts to be at z > 0.3. For each galaxy we will obtain using WEAVE high signal-to-noise spectra (S/N>15 per resolution element) in order to: study stellar ages, star formation and star formation histories, stellar and gas metallicities, stellar velocity dispersions and gas kinematics, the relations with their intrinsic (galaxy stellar mass, morphology/color/size) and environmental properties In other words we aim at extending the SDSS results to a 7 Gyr baseline. Uniqueness: spectral quality (all main galaxy properties) for a large sample as a function of intrinsic properties, redshift and environment.
17 3- StePs survey planning
18 3- StePs survey planning Main lines visibility:
19 3- StePs survey planning Photometric redshift preselection: how accurate? redshift
20 3- StePs survey planning Stellar ages, metallicities, dust extinction and velocity dispersions, are all recovered without significant systematic offsets (accuracy higher than 10%) with a S/N~15. Choi et al. 2014
21 3- StePs survey planning Stellar ages, metallicities, dust extinction and velocity dispersions, are all recovered without significant systematic offsets (accuracy higher than 10%) with a S/N~15. Citro, Pozzetti et al. in prep.
22 3- StePs survey planning S/N as a function of exp time Red Arm Credits to A. Mercurio
23 3- StePs survey planning S/N as a function of exp time Red Arm Blue Arm Credits to A. Mercurio
24 3- StePs survey planning S/N as a function of exp time Red Arm Blue Arm Credits to A. Mercurio (I-V)
25 3- StePs survey planning 7 Hours exp time for majority of galaxy population 14 Hours exp time for tail of reddest targets
26 3- StePs survey planning 1. Availability of good optical and near IR data, for photo-z s and target selection 2. Well sampled spectroscopic data or very high quality photo-z, for environment characterization 3. Any other ancillary data for environment (X-ray), morphologies (HST) etc
27 4- Latest news and future plans We have received positive feed-back from the Panel The STePs program in very much worthy of note, and is of high merit We view STePs to have transformative potential We are organizing a first team meeting beginning of February
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