NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-18 T23:13:15 PDT
Help | Comment | NED Home

For refcode 2016ApJ...827...33J:
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2016ApJ...827...33J Panchromatic Hubble Andromeda Treasury. XVI. Star Cluster Formation Efficiency and the Clustered Fraction of Young Stars Johnson, L. Clifton; Seth, Anil C.; Dalcanton, Julianne J.; Beerman, Lori C.; Fouesneau, Morgan; Lewis, Alexia R.; Weisz, Daniel R.; Williams, Benjamin F.; Bell, Eric F.; Dolphin, Andrew E.; Larsen, Soren S.; Sandstrom, Karin; Skillman, Evan D. Abstract. We use the Panchromatic Hubble Andromeda Treasury survey data set to perform spatially resolved measurements of star cluster formation efficiency (Gamma), the fraction of stellar mass formed in long-lived star clusters. We use robust star formation history and cluster parameter constraints, obtained through color-magnitude diagram analysis of resolved stellar populations, to study Andromeda's cluster and field populations over the last ~300 Myr. We measure Gamma of 4%-8% for young, 10-100 Myr-old populations in M31. We find that cluster formation efficiency varies systematically across the M31 disk, consistent with variations in mid-plane pressure. These Gamma measurements expand the range of well-studied galactic environments, providing precise constraints in an H I-dominated, low-intensity star formation environment. Spatially resolved results from M31 are broadly consistent with previous trends observed on galaxy-integrated scales, where Gamma increases with increasing star formation rate surface density (Sigma_SFR_). However, we can explain observed scatter in the relation and attain better agreement between observations and theoretical models if we account for environmental variations in gas depletion time (tau_dep_) when modeling Gamma, accounting for the qualitative shift in star formation behavior when transitioning from a H_2_-dominated to a H I-dominated interstellar medium. We also demonstrate that Gamma measurements in high Sigma_SFR_ starburst systems are well-explained by tau_dep_-dependent fiducial Gamma models. Key words: galaxies: individual: M31, galaxies: star clusters: general
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home