The JWST Early Release Science Program for Resolved Stellar Populations

Program Overview

The James Webb Early Release Program for Resolved Stellar Populations is a 27.5 hour program that is aqcuiring NIRCam and NIRISS imaging for three targets in the Local Group: globular cluster M92, ultra-faint dwarf galaxy Draco II, and star-forming dwarf galaxy WLM. Observations are scheduled for July and August 2022. Our first papers and data release are scheduled for Fall 2022.

Our ERS program will establish JWST as the premier facility for the study of resolved stellar populations. We are developing specialized NIRCam and NIRISS modules for the widely used crowded field photometry package DOLPHOT. We will release examples of how DOLPHOT can be used to reduce and analyze our ERS data. Our observations will be among the deepest infrared data ever acquired in the local Universe and they will showcase a wide range of science including determining precise ages for the oldeset objects in the Universe, measuring galaxy star formation and orbital histories, and investigating star formation and stellar evolution at extremely low-metallicities.

Team

* denotes program co-investigator

• Dan Weisz (UC Berkeley; program PI)
• Jay Anderson* (STScI)
• Racheal Beaton (Princeton)
• Alessandro Bressan (Padova)
• Alberto Bolatto (Maryland)
• Martha Boyer* (STScI)
• Michael Boylan-Kolchin (UT Austin)
• Alyson Brooks (Rutgers)
• James Bullock (UC Irvine)
• Roger Cohen (Rutgers)
• Andrew Cole* (Tasmania)
• Charlie Conroy (Harvard)
• Michael Cooper (UC Irvine)
• Matteo Correnti* (STScI)
• Julianne Dalcanton (CCA)
• Andrew Dolphin* (Raytheon)
• Aaron Dotter (Dartmouth)
• Tobias Fritz (Virginia)
• David Hogg (NYU)
• Chris Garling (OSU)
• Marla Geha* (Yale)
• Mario Gennaro (STScI)
• Karoline Gilbert (STScI)
• Leo Girardi (Padova)
• Ben Johnson (Harvard)
• Cliff Johnson (Northwestern)
• Jason Kalirai (JHUAPL)
• Nitya Kallivayalil* (Virginia)
• Evan Kirby (Notre Dame)
• Dustin Lang (Waterloo)
• Paola Marigo (Padova)
• Kristen McQuinn* (Rutgers)
• Alessandro Savino (UC Berkeley)
• Karin Sandstrom* (UC San Diego)
• Eddie Schlafly (Livermore)
• Evan Skillman (Minnesota)
• Erik Tollerud (STScI)
• Andrew Wetzel (UC Davis)
• Benjamin Williams* (Washington)

Publications

• The JWST Resolved Stellar Populations Early Release Science Program I.: NIRCam Flux Calibration (Boyer et al. 2022) arXiv NIRCam Flux Offsets

• The JWST Resolved Stellar Populations Early Release Science Program II.: Survey Overview (Weisz et al. 2023) arXiv

• The JWST Resolved Stellar Populations Early Release Science Program III.: Photometric Star-Galaxy Separations for NIRCam (Warfield et al. 2023) arXiv

• The JWST Resolved Stellar Populations Early Release Science Program. IV. The Star Formation History of the Local Group Galaxy WLM (McQuinn et al. 2024) arXiv

• The JWST Resolved Stellar Populations Early Release Science Program V. DOLPHOT Stellar Photometry for NIRCam and NIRISS (Weisz et al. 2024) arXiv

• The JWST Resolved Stellar Populations Early Release Science Program VI. Identifying Evolved Stars in Nearby Galaxies (Boyer et al. 2024) arXiv

Deliverables

Our first data release is anticipated for Spring 2024 and will include JWST stellar catalogs and examples of DOLPHOT application. Data products will be made available through the Mikulski Archive for Space Telescopes.

Useful Links

• JWST DOLPHOT documentation
• ERS page on MAST
• NIRCam Flux Offsets from Boyer+ 2022
• Program APT and Public PDF files
• DOLPHOT homepage

Talks & Press

• JWST ERS programs revealed
• Our Official ERS Webbinar
• JWST ERS programs in Physics Today

Contact

• Twitter
• Email

Contact

• Twitter
• Facebook
• Instagram
• GitHub

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