The PHANGS-AstroSat Atlas of Nearby Star-forming Galaxies
Year: 2024
Type: article
Abstract: We present the Physics at High Angular resolution in Nearby GalaxieS (PHANGS)-AstroSat atlas, which contains UV imaging of 31 nearby star-forming galaxies captured by the Ultraviolet Imaging Telescope on the AstroSat satellite. The atlas provides a homogeneous data set of far-UV and near-UV maps of galaxies within a distance of 22 Mpc and a median angular resolution of 1.″4 (corresponding to a physical scale between 25 and 160 pc). After subtracting a uniform UV background and accounting for Milky Way extinction, we compare our estimated flux densities to GALEX observations, finding good agreement. We find candidate extended UV disks around the galaxies NGC 6744 and IC 5332. We present the first statistical measurements of the clumping of the UV emission and compare it to the clumping of molecular gas traced with the Atacama Large Millimeter/submillimeter Array (ALMA). We find that bars and spiral arms exhibit the highest degree of clumping, and the molecular gas is even more clumped than the far-UV (FUV) emission in galaxies. We investigate the variation of the ratio of observed FUV to H α in different galactic environments and kiloparsec-sized apertures. We report that ∼65% of the variation of the log 10 (FUV/H α ) can be described through a combination of dust attenuation with star formation history parameters. The PHANGS-AstroSat atlas enhances the multiwavelength coverage of our sample, offering a detailed perspective on star formation. When integrated with PHANGS data sets from ALMA, the Very Large Telescope-MUSE, the Hubble Space Telescope, and JWST, it develops our comprehensive understanding of attenuation curves and dust attenuation in star-forming galaxies.
Authors: Hamid Hassani, Erik Rosolowsky, Eric W. Koch, Joseph Postma, Joseph Nofech, Harrisen Corbould, David Thilker, Adam K. Leroy, Eva Schinnerer, Francesco Belfiore, Frank Bigiel, Médéric Boquien, Mélanie Chevance, Daniel A. Dale, Oleg V. Egorov, Eric Emsellem, Simon C. O. Glover, Kathryn Grasha, Brent Groves, Kiana Henny, Jaeyeon Kim, Ralf S. Klessen, Kathryn Kreckel, J. M. Diederik Kruijssen, Janice C. Lee, Laura A. Lopez, Justus Neumann, Hsi-An Pan, Karin M. Sandstrom, Sumit K. Sarbadhicary, Jiayi Sun, Thomas G. Williams
Institutions: University of Alberta, Center for Astrophysics Harvard & Smithsonian, University of Calgary, Johns Hopkins University, The Ohio State University, Max Planck Institute for Astronomy, Arcetri Astrophysical Observatory, National Institute for Astrophysics, University of Bonn, University of Tarapacá, Heidelberg University, University of Wyoming, Lyon 1 Université, École Normale Supérieure de Lyon, Centre National de la Recherche Scientifique, European Southern Observatory, Université de Lyon, Centre de Recherche Astrophysique de Lyon, European Southern Observatory, Australian National University, ASTRO-3D, ARC Centre of Excellence for All-sky Astrophysics, The University of Western Australia, International Centre for Radio Astronomy Research, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Technical University of Munich, Space Telescope Science Institute, University of Arizona, Tamkang University, University of California System, University of California San Diego, University of Toronto, Canadian Institute for Theoretical Astrophysics, McMaster University, University of Oxford
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
OpenAlex ID: W4391753142