FLASH Talks: Patrick Kamieneski (ASU) & Daniel Maschmann (Steward)

Friday, 01 March 2024 noon — 1 p.m. MST

NOIRLab Headquarters | 950 North Cherry Ave., Tucson, AZ 85719

Patrick Kamieneski (ASU) & Daniel Maschmann (Steward)

Patrick Kamieneski, ASU
Title TBA

Abstract TBA

Daniel Maschmann, Steward
PHANGS-HST catalogs for ~100,000 star clusters and compact associations in 38 galaxies: Observed properties
We present the largest publicly available catalog of star clusters and compact associations, containing ~100,000 objects identified in 38 nearby galaxies (4 - 23 Mpc). The catalog is based on the PHANGS-HST Treasury Survey, which has obtained NUV, U, B, V and I imaging and is available on MAST. We show that to correctly characterize the evolutionary stage of star clusters the NUV and U band in addition to the conventional BVI bands are necessary. The UBVI color-color diagram of all objects aggregated across the 38 galaxies reveal three characteristic demographic regions: the young cluster locus, the middle-age plume, and the old globular cluster clump. Via spatial distribution analysis we see how young star clusters, formed in dense, molecular gas rich regions, free themselves from their dusty nursery and become progressively more dispersed over their lifetime, eventually reaching an almost uniform distribution, as seen for old globular clusters. We find that the relative cluster demographics of a galaxy are an excellent surrogate of its evolutionary stage: The fraction of young and middle aged clusters correlates with the galaxy’s position relative to the main sequence of star forming galaxies. All in all, the new PHANGS-HST cluster catalog not only brings a growth of a factor ~10 in statistics compared to literature samples but also provides additional coverage at different wavelengths with ALMA, VLT-MUSE and JWST observations. The presented sample is an outstanding resource for testing our understanding of star formation in the context of galaxy evolution.