Author(s): E. Rosolowsky, Dept. of Physics, University of Alberta, Edmonton, Alberta, CANADA|
Institution(s): 1. Dept. of Physics, University of Alberta, Edmonton, AB, Canada.
Contributing team(s): The Physics at High Angular resolution in Nearby GalaxieS (PHANGS) Team
In this talk, I will present the PHANGS-ALMA survey, a Large Project conducted in ALMA Cycle 5 to survey nearby galaxies at arcsecond resolution in CO (2-1). Combined with precursor data, the PHANGS-ALMA sample provides fully-sampled data for 74 galaxies, combining ALMA's 12-m, 7-m, and total power arrays. These targets are selected from the star-forming main sequence of nearby (<17 Mpc) galaxies, chosen to uniformly sample the stellar-mass and specific star formation rate space. At these distances, the projected resolution reaches scales <100 pc and we can resolve structures on scales comparable to the molecular scale height of galaxies. I will present the status of the ALMA survey, the data release plans, and highlight the preliminary results from the CO data. Notably, we find that the dynamical state of the molecular interstellar medium is remarkably close to self-gravitating over a wide range of galactic environments. Despite this, we find that the mass distribution of molecular clouds in these targets varies substantially, depending on the covering fraction of molecular material within the galaxy disk. This work makes use of the following ALMA data: ADS/JAO.ALMA#2017.1.00886.L. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.