@article{0cb517e3379143d6a11fa5180477e6b4,
title = "The PHANGS-AstroSat Atlas of Nearby Star-forming Galaxies",
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 Hα in different galactic environments and kiloparsec-sized apertures. We report that ∼65\% of the variation of the log10(FUV/Hα) 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.",
author = "Hamid Hassani and Erik Rosolowsky and Koch, \{Eric W.\} and Joseph Postma and Joseph Nofech and Harrisen Corbould and David Thilker and Leroy, \{Adam K.\} and Eva Schinnerer and Francesco Belfiore and Frank Bigiel and M{\'e}d{\'e}ric Boquien and M{\'e}lanie Chevance and Dale, \{Daniel A.\} and Egorov, \{Oleg V.\} and Eric Emsellem and Glover, \{Simon C.O.\} and Kathryn Grasha and Brent Groves and Kiana Henny and Jaeyeon Kim and Klessen, \{Ralf S.\} and Kathryn Kreckel and Kruijssen, \{J. M.Diederik\} and Lee, \{Janice C.\} and Lopez, \{Laura A.\} and Justus Neumann and Pan, \{Hsi An\} and Sandstrom, \{Karin M.\} and Sarbadhicary, \{Sumit K.\} and Jiayi Sun and Williams, \{Thomas G.\}",
note = "Funding Information: We are grateful for the comments of an anonymous referee that improved the quality of this paper. This work was conducted as part of the PHANGS collaboration. This publication uses the data from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Centre (ISSDC). H.H., E.R., J.N., E.W.K., and H.C. acknowledge the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), funding reference number RGPIN-2017-03987, and the Canadian Space Agency funding reference Nos. SE-ASTROSAT19, 22ASTALBER, 19ASTROSA2, and 21EXPUVI3. E.W.K. acknowledges support from the Smithsonian Institution as a Submillimeter Array (SMA) Fellow and the Natural Sciences and Engineering Research Council of Canada. R.S.K. and S.C.O.G. acknowledge funding from the European Research Council via the ERC Synergy Grant “ECOGAL” (project ID 855130), from the German Excellence Strategy via the Heidelberg Cluster of Excellence (EXC 2181-390900948) “STRUCTURES,” and from the German Ministry for Economic Affairs and Climate Action in project “MAINN” (funding ID 50OO2206). The team in Heidelberg is also grateful for the computing resources provided by The L{\"a}nd and DFG through grant INST 35/1134-1 FUGG and for data storage at SDS@hd through grant INST 35/1314-1 FUGG. M.B. gratefully acknowledges support from the ANID BASAL project FB210003 and from the FONDECYT regular grant 1211000. J.M.D.K. gratefully acknowledges funding from the DFG through an Emmy Noether Research Group (grant number KR4801/1-1), as well as from the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation program, via the ERC Starting Grant MUSTANG (grant agreement No. 714907). COOL Research DAO is a Decentralized Autonomous Organization supporting research in astrophysics aimed at uncovering our cosmic origins. M.C. gratefully acknowledges funding from the DFG through an Emmy Noether Research Group (grant No. CH2137/1-1). H.A.P. acknowledges support by the National Science and Technology Council of Taiwan under grant 110-2112-M-032-020-MY3. K.K. and O.E. gratefully acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) in the form of an Emmy Noether Research Group (grant No. KR4598/2-1; PI: Kreckel) and the European Research Council's starting grant ERC StG-101077573 (“ISM-METALS”). K.G. is supported by the Australian Research Council through the Discovery Early Career Researcher Award (DECRA) Fellowship (project number DE220100766) funded by the Australian Government. K.G. is supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. J.K. is supported by a Kavli Fellowship at the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC). H.H. acknowledges the use of ChatGPT to refine the English-language presentation of the ideas in this paper. Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",
year = "2024",
month = mar,
day = "1",
doi = "10.3847/1538-4365/ad152c",
language = "English",
volume = "271",
journal = "Astrophysical Journal, Supplement Series",
issn = "0067-0049",
publisher = "IOP Publishing",
number = "1",
}