2020 ngVLA Summer Short Talk Series

The next-generation Very Large Array Science Advisory Council (SAC) is organizing a cycle of weekly short online talks over the summer that focus on timely open science questions. Talks are scheduled to be 20-25 min, with another 15-20 min reserved for questions from the audience.

The goal of the series is to draw a contingent of early-career researchers and students who are interested in open astronomy problems by facilitating discussions on topics that are particularly important and/or timely covering a broad range of astronomy research areas, while also drawing connections to a present or future facilities (e.g., ALMA, JWST, SKA, ngVLA, the ELTs, LSST/Rubin, or a proposed NASA observatory). 


The talks (see schedule below) will be held online via Zoom Thursdays at 3 pm EDT and recorded/archived (along with the Q&A sessions) here for broader viewing.  We ask that you please use the link below to register for the entire series (it is free!) so that you receive all necessary Zoom connection information.  




Please Click Here to Register for the Webinar Series

Talk Schedule

Date Speaker Title Abstract / Video Recording


Tom Maccarone (Texas Tech)

The Sharpest View of Neutron Stars and Black Holes

I will discuss milliarcsecond imaging of neutron stars and accreting black holes.  The exquisite sensitivity and angular resolution of the Next Generation Very Large Array will allow precise estimates of the proper motions, and often, the geometric parallaxes of these systems.  Astrometry of stellar mass compact objects will provide vital information on natal kicks, and in some cases, system masses through astrometric wobble, yielding one of the few available clues about the nature of the central engines of supernovae.  For supermassive black holes, proper motions in combination with LISA standard siren distances will allow 6D mapping of the phase space of galaxy clusters, providing unique information about the distribution of dark matter within them.  Moving beyond imaging, the ngVLA's capability to use subarrays to make simultaneous measurements at many frequencies will open up the technique of eclipse mapping of X-ray binary jets, allowing a new probe of their structures and acceleration processes.




No Talk -- 4th of July Holiday


Chris Carilli (NRAO)

The ASPECS survey

The ASPECS survey is a sensitive, relatively large cosmic volume search for molecular gas across cosmic time. I will present the design of the survey, then summarize the primary results. We obtain the deepest mm-continuum image of the sky to date, and we make an unbiased determination of the dense gas history of the Universe out to z ~ 4.


Christine Wilson (McMaster)

Dense Gas and Star Formation in Nearby Starburst Galaxies

With its high sensitivity, excellent angular resolution, and wide spectral coverage, ALMA is revolutionizing our view of galaxies in the nearby universe. I will describe our work on the link between dense gas and star formation for a sample of 9 nearby galaxies from the ALMA archive, which includes measuring the resolved star formation law at high gas surface densities and identifying a new molecular line that appears to be an excellent tracer of the densest star forming gas.


Alyssa Goodman (Harvard)

Knitting Together an Amazing new Multi-Color View of the Milky Way, in 3D

Normally, when astronomers see beautiful, “3D” movies of the Milky Way or the stars and clouds within it, they assume those movies to be cartoons or computer simulations.  In this talk, I will describe revolutionary data sets  and data-science techniques that are enabling REAL 3D movies of the Milky Way to be made—right now. In particular, I will focus on how so-called “3D dust mapping” has gotten a tremendous distance resolution boost from Gaia, and how interweaving velocity information from spectral-line data cubes, dust maps and 3D stellar velocities  reveals never-before-seen views of the solar neighborhood of the Milky Way.  The recent discovery Radcliffe Wave, which redefines our understanding of Milky Way’s Local Arm (http://tinyurl.com/radwave), is just the first in a series of revelations to come from this knitting project. 


Roger Blandford (Stanford/KIPAC)

Ergomagnetospheres, Ejection Disks and Electromagnetic Jets

Recent, remarkable images, made by the EHT collaboration of M 87, exhibit a ring of emission, presumably orbiting a six billion solar mass black hole. It is proposed that what is observed is an extensive ergomagnetosphere that connects mechanically to a much larger ejection disk through a magnetic clutch. The ejection disk is envisaged to be powered primarily by the spinning hole and not the infalling gas, which is expelled as a jet-confining, hydromagnetic wind. Implications for general active galactic nuclei, other sources of relativistic jets and future observations will be briefly discussed.


Karin Öberg (Harvard)

High-Resolution Chemistry in Planet-Forming Disks

ALMA has revealed that planet-forming disks host a rich chemistry, with molecules displaying complex radial and vertical emission profiles. I'll review some of the chemical disk structures discovered so far, what they have taught us about the ongoing chemical evolution during planet-formation, and the distribution of volatiles in disks. I'll also discuss what additional observations are needed to further link disk chemistry to the compositions of nascent planets.


Katherine de Kleer (Caltech)

The Surface Environments of the Solar System Satellites

The satellites of the Solar System's giant planets are one of the current frontiers of planetary science, and will be the targets of multiple spacecraft missions in the coming decades. Observations of these objects with ALMA have provided maps of the atmospheres and subsurfaces of these worlds in unprecedented detail, complementing optical/infrared maps of surface composition at a similar resolution. This talk will discuss recent ALMA results on Solar System satellites and what we've learned from them about these objects' surface environments, and will discuss prospects for discovery with future facilities.


Jean Turner (UCLA)

Gas in Young Super Star Clusters



Sean Andrews (CfA)

Substructures in Protoplanetary Disks: Overview and Future Prospects

Over the past few years, we have found that small-scale "substructures" -- emission deviations on ~few-AU scales -- are prevalent in protoplanetary disks. We expect that these play fundamental roles in the evolution of disk material, and may even trace ongoing planet formation. I will review what we've learned so far, primarily from observations with ALMA, discuss the current limitations, and look forward to new opportunities for continued progress in quantifying and explaining the origins of these substructures.


Linda Tacconi (MPE)




Shri Kulkarni (Caltech)

Fast Radio Bursts - What Next?