NASA's James Webb Space Telescope

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Spectral Diagnostics to Explore the Cosmic Dawn with JWST

Science Meeting
July 31 - August 2, 2017
Baltimore STScI Muller Bahcall Auditorium

Spectroscopic observations from the James Webb Space Telescope (JWST) will be a powerful tool for probing the physics of galaxy formation. Emission-line measurements will provide important diagnostics of galaxy chemical composition, star-formation rates, feedback, stellar populations, and photo-ionizing continuum escape.  Recent spectroscopic observations of high redshift galaxies have revealed that new ingredients are required to model the spectral energy distributions of low metallicity galaxies, and to interpret the nebular spectra observed in the extreme emission-line galaxies. New spectral diagnostics based on rest-frame UV and optical emission lines have been developed that can take advantage of the wavelengths accessible for JWST spectroscopy of galaxies at z>7. There has been progress made on calibrating indirect probes of the conditions that facilitate the escape of ionizing photons using local galaxies. At the same time, theoretical studies have made significant advances in modeling the feedback and outflows in galaxies, and radiative transfer in the IGM at early epochs. This workshop aims to bring together expert observers and theorists to discuss the spectral diagnostics and efficient strategies to maximize the JWST science for exploring high-redshift galaxies.

Topics to be covered include:

• Observed properties of high redshift emission-line galaxies
• Observed properties of low redshift emission-line galaxies
• Lyman-alpha emission, visibility, profile shapes
• UV Continuum, ionizing photon production rate
• Spectral diagnostics for revealing the nature of ionizers
• Feedback, outflow geometry, and escape of ionizing radiation
• Stellar population, gas and dust in extreme emission line galaxies

The workshop will include invited talks, contributed talks, and posters. On the last day of the workshop there will also be breakout sessions scheduled to demonstrate JWST proposal planning tools (APT, ETC) and data analysis tools to help with the JWST observation planning.

Questions?  Please contact us at:

Confirmed Invited Speakers

Ricardo Amorín (Cambridge)
Alison Coil (UCSD)
Paul Crowther (Univ. of Sheffield)
Steven Finkelstein (UT Austin)
Nickolay Gnedin (Fermilab)
Timothy Heckman (JHU)
Anne Jaskot (Smith College)
Lisa Kewley (ANU)
Priyamvada Natarajan (Yale Univ.)
Pascal Oesch (Univ. of Geneva)
Masami Ouchi (Univ. of Tokyo)
Laura Pentericci (INAF-OAR)
Naveen Reddy (UCR)
Daniel Schaerer (Univ. of Geneva)
Elizabeth Stanway (Univ. of Warwick)
Daniel Stark (Univ. of Arizona)
Charles Steidel (Caltech)
Eros Vanzella (INAF-OABO)
Anne Verhamme (Univ. of Geneva)
John Wise (Georgia Tech) 

Science Organizing Committee

Swara Ravindranath (Chair)
Harry Ferguson (Co-Chair)
Claus Leitherer  (Co-Chair)
Janice Lee
Jennifer Lotz
Alaina Henry
Gabriel Brammer
Ivelina Momcheva
Norbert Pirzkal
​Jason Tumlinson 

Agenda for Monday, July 31, 2017 (8:00 a.m.-6:30 p.m.)

Time Topic Presenter
8:00-9:00 Registration and light breakfast (starting at 8:30)
9:00-9:10 Welcome  Nancy Levenson, Deputy Director, STScI
Session 1 Observed Properties of High Redshift Galaxies at Cosmic Dawn Ryan Trainor (Chair)
9:10-9:40 Understanding the Spectra of Reionization-era Galaxies Daniel Stark
9:40-10:10 Exploring the End of the Dark Ages with Spectroscopy: Lessons from HST for the JWST Era Pascal Oesch
10:10-10:25 Exploring Cosmic Dawn with Lyman Alpha Line Properties James Rhoads
10:25-10:40 A Blind Search for LyA Emission from Galaxies at z = 6-8 with Deep HST Grism Spectra as a Precursor to JWST Rebecca Larson
10:40-11:10 Coffee Break
Session 2 Lyman Continuum and Ionizing Budget at High Redshifts Camilla Pacifici (Chair)
11:10-11:40 UV Continuum and Ionizing Budget of Galaxies Steve Finkelstein
11:40-11:55 LYCAN: The LYman Continuum ANalysis Project Christian Binggeli
11:55-12:10 The Lyman-Continuum Photon Production Efficiency in z=4-5 Galaxies Rychard Bouwens
12:10-12:25 Exploring the Ionizing Photon Production Efficiency of Star-forming Galaxies at z~2 using Optical Spectral Diagnostics Irene Shivaei
12:25-12:45 Poster Talks (rapid-fire talks)
12:45-2:00 Lunch 
Session 3 Spectral Properties of Cosmic Noon Galaxies Ben Weiner (Chair)
2:00-2:30 Reconciling (and Using) the Stellar and Nebular Spectra of High Redshift Galaxies Charles Steidel
2:30-3:00 Observing AGN-Driven Feedback in High Redshift Galaxies Alison Coil
3:00-3:15 New Insights into Measuring Gas Chemistry and Ionization in High-z Star-forming Galaxies with the Keck Baryonic Structure Survey Alison Strom
3:15-3:30 Sharpening Our View of Star Formation in Distant Galaxies using Slitless Spectroscopy Nor Pirzkal
3:30-4:00 Coffee Break
Session 4 Extreme Emission Line Galaxies across Redshifts Genoveva Micheva (Chair)
4:00-4:30 Searching for Cosmic Reionizers: Spectral Clues from Low-Redshift Analogs Anne Jaskot
4:30-5:00 Extreme Emission Line Galaxies: Probing Early Stages in Galaxy Evolution Ricardo Amorin
5:00-5:15 The MOSEL Survey : Emission Line Galaxies at 3<z<4 Kim-Vy Tran
5:15-5:30 Linking Green Peas to Local LyC Emitters Sally Oey
5:30-6:30 Reception

Agenda for Tuesday, August 1, 2017 (9:00 a.m.-6:00 p.m.)

Time Topic Presenter
Session 5 Lyman-alpha Emitters, Line profiles, Lyman-alpha Escape Anne Jaskot (Chair)
9:00-9:30 Lya Emitters from the Cosmic Noon to the Heart of the Reionization Epoch Masami Ouchi
9:30-10:00 Escape of Lyman-Alpha Radiation from Galaxies Anne Verhamme
10:00-10:15 Green Peas as Sources of Lyman Alpha and LyC Emission: Lessons and Questions from Low-redshift Analog Galaxies Alaina Henry
10:15-10:30 Constraining IGM and ISM Properties During the Epoch of Reionization from Bayesian Inference of Lyman Alpha Emission Charlotte Mason
10:30-11:00 Coffee Break
Session 6 Feedback and Outflows David Bowen (Chair)
11:00-11:30 Local Clues to the Reionization of the Universe Tim Heckman
11:30-12:00 Amusing MUSE: Witnessing Newborn Super Star Clusters in the First Two Gyrs Eros Vanzella
12:00-12:15 Spatially Resolving the Rest-Frame UV of Star-forming Galaxies at z=2-3: Lessons from VLT-MUSE Bethan James
12:15-12:30 MEGaSaURA: The Definitive UV Spectral Atlas of Star-forming Galaxies at Cosmic Noon -- the Training Set for Cosmic Dawn Jane Rigby
12:30-12:40 Group Photo at Entrance
12:40-2:00 Lunch
Session 7 Emission Line Diagnostics and Galaxy Properties with JWST Ivelina Momcheva (Chair)
2:00-2:15 Cosmic Reionization and JWST: Emission Line Diagnostics to Identify Lyman Continuum Emitters Stephane de Barros
2:15-2:30 Synergy between Galaxy Models and Data for JWST Camilla Pacifici
2:30-2:45 How the Kinematic State of Very High Redshift Galaxies Will Be Deciphered with JWST Susan Kassin
2:45-3:00 Nebular Spectroscopy of Dwarf Galaxies at z>2 Ryan Trainor
3:00-3:15 Mid-IR Spectroscopy of Distant Galaxies with MIRI/JWST Luis Colina
3:15-3:30 The Potential of a Wide-field NIRSpec Spectroscopic Galaxy Survey with JWST Bernd Husemann
3:30-4:00 Coffee Break
Session 8 Theoretical Modeling of First Stars and Black Holes Bernd Husemann (Chair)
4:00-4:30 Physical and Observable Predictions for the First Galaxies John Wise
4:30-5:00 Spectral Predictions for the First Black Holes Priyamvada Natarajan
5:00-5:15 Introducing the FirstLight Project: UV Luminosity Function and Scaling Relations of Primeval Galaxies Daniel Ceverino
5:15-5:30 First Light: Exploring the Spectra of Galaxies at High-Redshift Kirk Barrow
5:30-6:00 Leave for Dinner at Gertrude's

Agenda for Wednesday, August 2, 2017 (9:00 a.m.-4:30 p.m.)

Time Topic Presenter
Session 9 Ingredients for Modeling Spectra of High Redshift Galaxies Susan Kassin (Chair)
9:00-9:30 Massive Stars and Their Importance for Interpreting the Emission Line Spectra of Metal-Poor Galaxies Paul Crowther
9:30-10:00 Interpreting the Properties of Star Formation with Stellar Population Models Elizabeth Stanway
10:00-10:15 New Insights into the Physical Properties of Low-mass Star-forming Galaxies: Implications for Cosmic Reionization and Future Role of JWST Jacopo Chevallard
10:15-10:30 The Interstellar Medium of High Redshift Galaxies: Hints from Emission Lines Andrea Ferrara
10:30-11:00 Coffee Break
Session 10 IGM Properties, Dust, and Chemical Enrichment at Early Epochs Gabe Brammer (Chair)
11:00-11:30 Key Results on the Dust Attenuation, Equivalent Width Distributions, and Ionizing Escape Fractions Naveen Reddy
11:30-11:45 KBSS: Correlations Between Dust Extinction, Star Formation, and Metallicity in z ~ 2-3 Galaxies Rachel Theios
11:45-12:15 Properties of the Inter-Galactic Medium during the Reionization Epoch Nick Gnedin
12:15-12:30 Workshop Summary and Closing Remarks
12:30-1:30 Lunch
JWST Proposal Planning Demo Sessions
1:30-2:30 NIRSpec MSA Planning Tool 
2:30-3:00 Break
3:00-3:30 APT/ETC (breakout sessions)
3:30-4:30 JWST Data Analysis Tools (breakout sessions)

Poster Presentations

Title Author
CHANDRA X-ray Observatory and Hubble Space Telescope Observations of the Cluster GLIMPSE-C01 Jeremy Hare (The George Washington University),  Oleg Kargaltsev (The George Washington University), Blagoy Rangelov (The George Washington University/Texas State University), Leisa Townsley (Pennsylvania State University), and Patrick Broos (Pennsylvania State University)
Estimating Exposure Times for Lensed SMGs using JWST ETC Kedar A. Phadke and Joaquin D. Vieira (University of Illinois)
Exploring Feedback Effects on Parsec Scales across Primordial Analogues Bethan James (STScI)
Exploring the Semi-Forbidden CIII]1909 Emission in Green Pea Galaxies Swara Ravindranath (STScI), TalaWanda Monroe (STScI), Anne Jaskot (UMass), Jason Tumlinson (STScI), and Harry Ferguson (STScI)
GAME: GAlaxy Machine learning for Emission lines Graziano Ucci (Scuola Normale Superiore)
High [OIII]/[OII] Ratios in Spectra of Star-forming Galaxies: What Drives the Emission of Extreme Oxygen Lines? M. Paalvast (Leiden Observatory), A. Verhamme (Centre de Recherche en Astrophysique de Lyon/Observatoire de Genève), L.A. Straka (Leiden Observatory), J. Brinchmann (Leiden Observatory/Centro de Astrofisica de Universidade do Porto), E.C. Herenz (Leibniz Institute for Astrophysics Potsdam), D. Carton (Centre de Recherche en Astrophysique de Lyon), M. Gunawardhana  (Leibniz Institute for Astrophysics Potsdam), M. Maseda  (Leibniz Institute for Astrophysics Potsdam), L. Wisotzki (Leibniz Institute for Astrophysics Potsdam), and L. Michel-Dansac (Centre de Recherche en Astrophysique de Lyon)
The Mass Metallicity Relation of z~2 Lensed Dwarf Galaxies: An Extension Down to M* ~ 107 Mʘ Tim Gburek (University of California - Riverside), Brian Siana (University of California - Riverside), Anahita Alavi (University of California - Riverside), ​Bill Freeman (University of California - Riverside),  Johan Richard (CRAL-Lyon), and  Daniel Stark (University of Arizona)
Maximizing the Impact of JWST: Developing Diagnostics to Quantify Mass Outflow Rates in Nearby Active Galaxies Mitchell Revalski (Georgia State University), D.M. Crenshaw (Georgia State University), T.C. Fischer (NASA GSFC), S.B. Kraemer (The Catholic University of America), and H.R. Schmitt (Naval Research Laboratory)
Multi Wavelength Properties of First Quasars and Early Galaxies Moupiya Maji , Qirong Zhu, and Yuexing Li (Pennsylvania State University)
[Ne III]λ3869 as a Diagnostic for Lyman Continuum Candidate Selection Genoveva Micheva and Sally Oey (University of Michigan)
Prospector: Stellar Population Inference from Spectra and Photometry Benjamin Johnson (Harvard University CfA) with Charlie Conroy, Nell Byler, and Joel Leja
Radio Galaxies at the Epoch of Reionisation Aayush Saxena (Leiden Observatory)
Star Formation and Emission Line Properties in Extreme to Normal ELGs, using WFC3-IR Grism Spectra at z=1-2 Benjamin Weiner (Steward/MMT Obs), J. Trump, D. Kocevski, and A. Morris
Star Formation Intensity Correlates with Interstellar Gas Pressure in Low-redshift Analog Galaxies Tianxing Jiang, Sangeeta Malhotra, and Huan Yang (Arizona State University)
Studying Lyα Escape and Lyα Sizes in Green Pea Galaxies Huan Yang (Arizona State University), Sangeeta Malhotra, Max Gronke, James Rhoads, Claus Leitherer, Aida Wofford, Mark Dijkstra, and Tianxing Jiang
Using Extreme [OIII]-Emitters at Cosmic Noon to Trace Galaxy Evolution Ben Forrest and Kim-Vy Tran (Texas A&M University)