Telecon notes, NGVLA Transients/Physics SWG 2014/11/05
(notes taken by PD)
Geoff: Time domain (GW counterparts, time-variable imaging, TDEs) and Physics (GC pulsars, plasma physics, stellar/solar work) have good science cases. Two areas where more discussion is needed are synoptic surveys and cosmology projects
-- Megamasers, evolution of constants, redshift vs time, large-scale molecular gas surveys. Distinction between "root-N" science and novel capabilities not clear for cosmology? Postpone discussion for now (right people not on telecon).
-- is telescope survey-driven or PI-driven? Rachel: mix of both is optimal. Miguel: for decadal survey, needs to involve broad community; large survey data more accessible. Geoff: what future facilities will this interact with (LSST, ALMA, ...)? Rachel: general imaging pipeline needed for broad usability. Steve: not really a "science" issue. Miguel: long baselines, sparse UV much harder to make usable; tension between capability and usability. Geoff: consider SKA precursors (survey mode) vs ALMA (project mode)
What are critical specs for each science product: eg, GC pulsars need BW, freq coverage, sensitivity but not any specific UV coverage
(Walter): LSST probably more interesting for AGN, monitoring variability. Interesting radio work requires VLBI. Geoff: anything interesting at high-sensitivity, mid-resolution? Walter: searches for dual AGN may be interesting. Not clear if this will find large new population.
(Steve): Focus has moved towards sub-mm since radio population has been well investigated. Improved resolution is good. But more interesting for astrophysics than for cosmology.
Geoff: Large-area surveys (eg of molecular lines) could benefit from improved short-baseline versus current VLA. (Miguel?) not just intensity mapping, but imaging generally, eg M31 halos.
Laura: What is goal of telecon, define science or stimulate discussion? Geoff: come up with ~3 high-profile science cases to present at AAS, also stimulate discussion, evetually whitepaper with broader input.
EM counterparts to NS mergers
(eg, LIGO) Laura: important future science case. Geoff: what are telescope requirements? Laura: At 5 GHz or 30 GHz transients will vary on shorter timescales, be much easier to associate w/ GW event. multi-freq and wide-field important. Steve: long duration (~days) means survey speed main spec for this. events will be pretty bright, more of a VLA case. Geoff: Should look at Metzger & Berger paper for predictions. What are future (kHz) GW instruments? eLISA may not be looking at right sources.
Laura: survey of stellar-mass BHs in our galaxy. needs wide-area, deep (uJy) survey. Start in galactic bulge, but all-sky also relevant. Flat-spectrum, mainly want sensitivity and resolution to filter out confusing foreground.
Speakers for AAS
Geoff: SOC invited Kawabe (Japan) for international slot. Suggestion of M. Kramer for other speaker to discuss GC pulsars. Other possibilities: Cordes, Kulkarni, Bildsten, Pen, Perran, Nissanke, Nakar, Metzger. Steve: get someone who can cover all the way from neutron stars to MBHs. General agreement that theorist (or maybe optical observer) good idea.
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One more telecon pre-Thanksgiving, in about 2 weeks.