The PHANGS-Hα survey. Ground-based narrow-band imaging of nearby star-forming galaxies

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Main Authors:	Razza, Alessandro, Blanc, Guillermo A., Groves, Brent, Congiu, Enrico, Neumann, Justus, Pan, Hsi-An, Ho, I-Ting, Barnes, Ashley T., Belfiore, Francesco, Boquien, Médéric, Burton, Charlie, Chevance, Mélanie, Egorov, Oleg, Emsellem, Eric, Faesi, Chris, Glover, Simon C. O., Grasha, Kathryn, Klessen, Ralf S., Kreckel, Kathryn, Leroy, Adam K., McElroy, Rebecca, Pessa, Ismael, Schinnerer, Eva, Tomičić, Neven, Amiri, Amirnezam, Anand, Gagandeep S., Cao, Yixian, Dale, Daniel A., Dlamini, Simthembile, Li, Jing, Méndez-Delgado, J. Eduardo, Murphy, Eric J., Pathak, Debosmita, Querejeta, Miguel, Ramambason, Lise, Rosolowsky, Erik, Scheuermann, Fabian, Úbeda, Leonardo, Williams, Thomas G.
Format:	Preprint
Published:	2026
Subjects:	Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Razza, Alessandro Blanc, Guillermo A. Groves, Brent Congiu, Enrico Neumann, Justus Pan, Hsi-An Ho, I-Ting Barnes, Ashley T. Belfiore, Francesco Boquien, Médéric Burton, Charlie Chevance, Mélanie Egorov, Oleg Emsellem, Eric Faesi, Chris Glover, Simon C. O. Grasha, Kathryn Klessen, Ralf S. Kreckel, Kathryn Leroy, Adam K. McElroy, Rebecca Pessa, Ismael Schinnerer, Eva Tomičić, Neven Amiri, Amirnezam Anand, Gagandeep S. Cao, Yixian Dale, Daniel A. Dlamini, Simthembile Li, Jing Méndez-Delgado, J. Eduardo Murphy, Eric J. Pathak, Debosmita Querejeta, Miguel Ramambason, Lise Rosolowsky, Erik Scheuermann, Fabian Úbeda, Leonardo Williams, Thomas G.
author_facet	Razza, Alessandro Blanc, Guillermo A. Groves, Brent Congiu, Enrico Neumann, Justus Pan, Hsi-An Ho, I-Ting Barnes, Ashley T. Belfiore, Francesco Boquien, Médéric Burton, Charlie Chevance, Mélanie Egorov, Oleg Emsellem, Eric Faesi, Chris Glover, Simon C. O. Grasha, Kathryn Klessen, Ralf S. Kreckel, Kathryn Leroy, Adam K. McElroy, Rebecca Pessa, Ismael Schinnerer, Eva Tomičić, Neven Amiri, Amirnezam Anand, Gagandeep S. Cao, Yixian Dale, Daniel A. Dlamini, Simthembile Li, Jing Méndez-Delgado, J. Eduardo Murphy, Eric J. Pathak, Debosmita Querejeta, Miguel Ramambason, Lise Rosolowsky, Erik Scheuermann, Fabian Úbeda, Leonardo Williams, Thomas G.
contents	We present PHANGS-Hα, a narrow-band imaging survey that maps Hα emission over a sample of 65 nearby massive star-forming galaxies. The data were obtained using the MPG-ESO 2.2-meter telescope at La Silla and the du Pont 2.5-meter telescope at Las Campanas Observatory, in the framework of the multi-wavelength cloud-scale (50-100 pc) resolution mapping of molecular gas and star formation conducted by the Physics at High Angular resolution in Nearby GalaxieS (PHANGS) collaboration. PHANGS-Hα complements the already published PHANGS-ALMA, PHANGS-MUSE, PHANGS-HST, and PHANGS-JWST surveys, providing an anchor point for the photometric and astrometric calibration of these datasets, as well as samples of H ii regions, and star formation rate maps for the bulk of the PHANGS sample. We present observations, data processing, and calibration of the PHANGS-Hα dataset, as well as the procedures used to derive emission-line fluxes from narrow-band imaging. A subset of galaxies with available spectroscopic Ha mapping from the PHANGS-MUSE survey allows for a detailed comparison with the narrow-band photometry presented here. This informs a series of best practices for the processing of narrow-band Hα imaging that we apply to the full dataset.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_25627
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	The PHANGS-Hα survey. Ground-based narrow-band imaging of nearby star-forming galaxies Razza, Alessandro Blanc, Guillermo A. Groves, Brent Congiu, Enrico Neumann, Justus Pan, Hsi-An Ho, I-Ting Barnes, Ashley T. Belfiore, Francesco Boquien, Médéric Burton, Charlie Chevance, Mélanie Egorov, Oleg Emsellem, Eric Faesi, Chris Glover, Simon C. O. Grasha, Kathryn Klessen, Ralf S. Kreckel, Kathryn Leroy, Adam K. McElroy, Rebecca Pessa, Ismael Schinnerer, Eva Tomičić, Neven Amiri, Amirnezam Anand, Gagandeep S. Cao, Yixian Dale, Daniel A. Dlamini, Simthembile Li, Jing Méndez-Delgado, J. Eduardo Murphy, Eric J. Pathak, Debosmita Querejeta, Miguel Ramambason, Lise Rosolowsky, Erik Scheuermann, Fabian Úbeda, Leonardo Williams, Thomas G. Astrophysics of Galaxies We present PHANGS-Hα, a narrow-band imaging survey that maps Hα emission over a sample of 65 nearby massive star-forming galaxies. The data were obtained using the MPG-ESO 2.2-meter telescope at La Silla and the du Pont 2.5-meter telescope at Las Campanas Observatory, in the framework of the multi-wavelength cloud-scale (50-100 pc) resolution mapping of molecular gas and star formation conducted by the Physics at High Angular resolution in Nearby GalaxieS (PHANGS) collaboration. PHANGS-Hα complements the already published PHANGS-ALMA, PHANGS-MUSE, PHANGS-HST, and PHANGS-JWST surveys, providing an anchor point for the photometric and astrometric calibration of these datasets, as well as samples of H ii regions, and star formation rate maps for the bulk of the PHANGS sample. We present observations, data processing, and calibration of the PHANGS-Hα dataset, as well as the procedures used to derive emission-line fluxes from narrow-band imaging. A subset of galaxies with available spectroscopic Ha mapping from the PHANGS-MUSE survey allows for a detailed comparison with the narrow-band photometry presented here. This informs a series of best practices for the processing of narrow-band Hα imaging that we apply to the full dataset.
title	The PHANGS-Hα survey. Ground-based narrow-band imaging of nearby star-forming galaxies
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2604.25627