The PHANGS-HST-Halpha Survey: Warm Ionized Gas Physics at High Angular resolution in Nearby GalaxieS with the Hubble Space Telescope
Abstract
The PHANGS project is assembling a comprehensive, multi-wavelength dataset of nearby (~5-20 Mpc), massive star-forming galaxies to enable multi-phase, multi-scale investigations into the processes that drive star formation and galaxy evolution. To date, large survey programs have provided molecular gas (CO) cubes with ALMA, optical IFU spectroscopy with VLT/MUSE, high-resolution NUV--optical imaging in five broad-band filters with HST, and infrared imaging in NIRCAM+MIRI filters with JWST. Here, we present PHANGS-HST-Halpha, which has obtained high-resolution (~2-10 pc), narrow-band imaging in the F658N or F657N filters with the HST/WFC3 camera of the warm ionized gas in the first 19 nearby galaxies observed in common by all four of the PHANGS large programs. We summarize our data reduction process, with a detailed discussion of the production of flux-calibrated, Milky Way extinction corrected, continuum-subtracted Halpha maps. PHANGS-MUSE IFU spectroscopy data are used to background subtract the HST-Halpha maps, and to determine the [NII] correction factors for each galaxy. We describe our public data products and highlight a few key science cases enabled by the PHANGS-HST-Halpha observations.
Keywords
Cite
@article{arxiv.2503.18791,
title = {The PHANGS-HST-Halpha Survey: Warm Ionized Gas Physics at High Angular resolution in Nearby GalaxieS with the Hubble Space Telescope},
author = {Rupali Chandar and Ashley T. Barnes and David A. Thilker and Miranda Caputo and Matthew R. Floyd and Adam K. Leroy and Leonardo Ubeda and Janice C. Lee and Médéric Boquien and Daniel Maschmann and Francesco Belfiore and Kathryn Kreckel and Simon C. O. Glover and Ralf S. Klessen and Brent Groves and Daniel A. Dale and Eva Schinnerer and Eric Emsellem and Erik Rosolowsky and Frank Bigiel and Guillermo Blanc and Melanie Chevance and Enrico Congiu and Oleg V. Egorov and Chris Faesi and Kathryn Grasha and Kirsten L. Larson and Laura A. Lopez and Angus Mok and Justus Newmann and Eve Ostriker and Alessandro Razza and Patricia S'anchez-Bl'azquez and Franesco Santoro and Kiayi Sun and Antonio Usero and Elizabeth Watkins and Bradley C. Whitmore and Thomas G. Williams},
journal= {arXiv preprint arXiv:2503.18791},
year = {2025}
}
Comments
published in the Astronomical Journal