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Journal Articles The Astrophysical Journal Supplement Series Year : 2022

The PHANGS-HST Survey: Physics at High Angular Resolution in Nearby Galaxies with the Hubble Space Telescope

Janice C. Lee
  • Function : Author
Bradley C. Whitmore
  • Function : Author
David A. Thilker
  • Function : Author
Sinan Deger
Kirsten L. Larson
  • Function : Author
Leonardo Ubeda
  • Function : Author
Gagandeep S. Anand
  • Function : Author
Médéric Boquien
Rupali Chandar
Daniel A. Dale
  • Function : Author
Adam K. Leroy
  • Function : Author
Erik Rosolowsky
Eva Schinnerer
Judy Schmidt
  • Function : Author
James Lilly
  • Function : Author
Jordan Turner
Schuyler van Dyk
  • Function : Author
Richard L. White
  • Function : Author
Ashley T. Barnes
  • Function : Author
Francesco Belfiore
Frank Bigiel
Guillermo A. Blanc
  • Function : Author
Yixian Cao
Melanie Chevance
  • Function : Author
Enrico Congiu
Oleg V. Egorov
  • Function : Author
Simon C. O. Glover
  • Function : Author
Kathryn Grasha
Brent Groves
Jonathan D. Henshaw
  • Function : Author
Ralf S. Klessen
  • Function : Author
Eric Koch
Kathryn Kreckel
J. M. Diederik Kruijssen
  • Function : Author
Daizhong Liu
Laura A. Lopez
  • Function : Author
Ness Mayker
Sharon E. Meidt
  • Function : Author
Eric J. Murphy
  • Function : Author
Hsi-An Pan
Jérôme Pety
Miguel Querejeta
Alessandro Razza
Toshiki Saito
Patricia Sánchez-Blázquez
  • Function : Author
Francesco Santoro
Amy Sardone
Fabian Scheuermann
  • Function : Author
Andreas Schruba
  • Function : Author
Jiayi Sun
Antonio Usero
E. Watkins
  • Function : Author
Thomas G. Williams
  • Function : Author


The PHANGS program is building the first data set to enable the multiphase, multiscale study of star formation across the nearby spiral galaxy population. This effort is enabled by large survey programs with the Atacama Large Millimeter/submillimeter Array (ALMA), MUSE on the Very Large Telescope, and the Hubble Space Telescope (HST), with which we have obtained CO(2-1) imaging, optical spectroscopic mapping, and high-resolution UV-optical imaging, respectively. Here, we present PHANGS-HST, which has obtained NUV-U-B-V-I imaging of the disks of 38 spiral galaxies at distances of 4-23 Mpc, and parallel V- and I-band imaging of their halos, to provide a census of tens of thousands of compact star clusters and multiscale stellar associations. The combination of HST, ALMA, and VLT/MUSE observations will yield an unprecedented joint catalog of the observed and physical properties of ~100,000 star clusters, associations, H II regions, and molecular clouds. With these basic units of star formation, PHANGS will systematically chart the evolutionary cycling between gas and stars across a diversity of galactic environments found in nearby galaxies. We discuss the design of the PHANGS-HST survey and provide an overview of the HST data processing pipeline and first results. We highlight new methods for selecting star cluster candidates, morphological classification of candidates with convolutional neural networks, and identification of stellar associations over a range of physical scales with a watershed algorithm. We describe the cross-observatory imaging, catalogs, and software products to be released. The PHANGS high-level science products will seed a broad range of investigations, in particular, the study of embedded stellar populations and dust with the James Webb Space Telescope, for which a PHANGS Cycle 1 Treasury program to obtain eight-band 2-21 μm imaging has been approved.
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Dates and versions

insu-03667482 , version 1 (13-05-2022)





Janice C. Lee, Bradley C. Whitmore, David A. Thilker, Sinan Deger, Kirsten L. Larson, et al.. The PHANGS-HST Survey: Physics at High Angular Resolution in Nearby Galaxies with the Hubble Space Telescope. The Astrophysical Journal Supplement Series, 2022, 258, ⟨10.3847/1538-4365/ac1fe5⟩. ⟨insu-03667482⟩
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