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Charge to discussion groups

Evolution of Galaxies through the HI Window
February 1-3, 2008

Martha Haynes (Cornell University)


Astro2010: The Need for a US HI strategy
· HI science is undergoing a renaissance driven both by science and by technology · Sc · · · · · ience EOR/dark ages exploration Importance of gas to galaxy evolution Kinematic tracer of interactions Distinct probe of cosmology Tracer of dark matter

· Technology · "Cameras": Feed arrays => phased arrays · New antennas/dish designs · Broadband, low noise receivers · Flexible, multibit digital spectrometers · Processing capability


Our challenge during this conference
· Let us discuss the science that HI studies across cosmic time can drive · Let's dream a long term vision: SKA · Let's articulate a shorter term roadmap that: · Leads towards our long term vision => dream! · Achieves exciting and critical science results along the way => maintain vitality! · Articulates the path in a realistic and inclusive manner => be real! · We can't have it all (right away) · We won't have it all (right away) · We all need to be involved (now)


Discussion groups (over wine/pißa coladas)
Discussion Groups: one approach
· Is Leo right? · Is Gerhard right? · Is Liese right? · Is Oleg right? · Is Steve right? · Is John right? · ..................... Maybe not the best organization.....


Our challenge during this conference
Hypotheses:
· Dark Ages/ EOR experiments will proceed · RSST/SKA will be built > 2020 1. What are the principle questions for which HI science provides CRITICAL clues could be answered in the next 10 years? · What do those of you who aren't HI observers need from us? · What do we need from you? 2. What are the observational/technical specs required to achieve them? (Reality check)


Science Discussion groups
· Dark ages science/EOR (z > 6) · High redshift galaxies (z > 0.5) · Intermediate redshifts (0.25 -0.5) · Cosmic web, local DLAs · HI mass function · HI SF connection galaxy connection · DM Halo

· Near-near field: Milky Way/Local Group


US Strategy
· Dark Ages/EOR
· Several experiments using somewhat different approaches underway · Technical issues associated with RFI and foregrounds recognized and proceeding · 2nd generation experiments should follow these · Is this program on track? · THEORY/SIMULATIONS => Further work needed? What don't you (really) know??!

WHAT CAN HI DO FOR YOU?


US Strategy
· How do galaxies accrete their gas?
· · · · · · · · Is Leo right? What are the/all HVCs? Does the total cold gas vary as fn (T, L, z...)? How well does HI map the total gas? Where do the metals in DLAs come from? Where do blue sequence E/SO's get their gas? How to DM halos map to real galaxies? Are the simulations correct? Open questions?

WHAT CAN HI DO FOR YOU?


US Strategy
· Normal galaxies
· How do baryonic components (HI, H2, stars) compare to dynamical mass as f(L, SFR, environment) over cosmic time? · Where is the HI in blue cloud galaxies? · Why are some HI disks very extended? · How does evolution in HI relate to evolution in SFR? Is HI the smoke or the gun? · Cold vs hot gas accretion around AGN

WHAT CAN HI DO FOR YOU?


US Strategy
· Dwarf galaxies
· Where is/are the gas/galaxies in voids? Is there a "void problem"? · Are their gas-rich "missing satellites"? · Are there "starless" dwarfs? · What drives variation in SFH? · What is duty-cycle for SB dwarfs? · How many dwarfs are there? · How many? 100, 1000, 10000...

WHAT CAN HI DO FOR YOU?


US Strategy
· HI in interactions
· Do interactions drive the evolution of the SFR density? · In major mergers, what happens to the gas? · What triggers/regulates SF in normal disks? · What can HI teach us about evolution in clusters? · How many dwarfs are formed in interactions? · What is the impact of feedback?

WHAT CAN HI DO FOR YOU?


US Strategy
· HIMF/evolution
· · · · · Why does ALFALFA detect so many galaxies? Is there a universal HIMF? Is there a promordial HIMF? How does HIMF/HI evolve with z? What do simulations predict about HIMF (not just "cold gas")?

WHAT CAN HI DO FOR YOU?


US Strategy
· + Anything else : this is your chance to make a case for what we need to do!

WHAT CAN HI DO FOR YOU? Should we use current facilities in new ways to build towards RSST/SKA?



US Strategy
· · · · · · · · · · EVLA surveys: Blind? Deep? Commensal? Next generation Arecibo surveys GB T? ATA Low frequency experiments Collaborations/participation in/with international projects Critical theory/simulation challenges Technology development Direct collaboration with surveys/projects at other wavelengths Infrastructure issues: education/training/support