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Masses, Star Formation Efficiencies, and Dynamical Evolution of 18,000 H II Regions

  • Authors: Debosmita Pathak, Adam K. Leroy, Ashley. T. Barnes, Todd A. Thompson, Laura A. Lopez, Karin M. Sandstrom, Jiayi Sun, Simon C. O. Glover, Ralf S. Klessen, Eric W. Koch, Kirsten L. Larson, Janice Lee, Sharon Meidt, Patricia Sanchez-Blazquez, Eva Schinnerer, Zein Bazzi, Francesco Belfiore, Médéric Boquien, Ryan Chown, Dario Colombo, Enrico Congiu, Oleg V. Egorov, Cosima Eibensteiner, Sushma Kurapati, Miguel Querejeta, Daniel A. Dale, Timo Kravtsov, Mansi Padave, D. J. Pisano, Erik Rosolowsky, Sumit K. Sarbadhicary, Thomas G. Williams, Remy Indebetouw, Hsi-An Pan, Leonardo Úbeda, Amirnezam Amiri, Frank Bigiel, Guillermo A. Blanc, Kathryn Grasha

Debosmita Pathak et al 2025 The Astrophysical Journal Letters 993 .

  • Provider: AAS Journals

Caption: Figure 4.

Top left: distribution of H II region escape velocities in galaxy centers and disks. Middle left: distribution of pressures due to H II region self-gravity for ﹩{M}_{{\rm{sh}}}=50 \% {M}_{{\rm{Mol}}}^{{\rm{init}}}﹩ (fiducial value; solid gray), ﹩60 \% {M}_{{\rm{Mol}}}^{{\rm{init}}}﹩ (dashed gray), and ﹩70 \% {M}_{{\rm{Mol}}}^{{\rm{init}}}﹩ (dotted–dashed gray); disk 〈PDE〉 (from J. Sun et al. 2023; maroon); fiducial PGrav + 〈PDE〉 (purple), and total PFeedback (green). Bottom left: distribution of H II region Rcirc (gray hatches) and the sizes at which we expect PGrav = 〈PDE〉 (maroon), PGrav = PFeedback (green), and PGrav + 〈PDE〉 = PFeedback (purple). Right: H II region overpressure (shaded blue) vs. underpressure (shaded orange) for PFeedback/PGrav (gray) and PFeedback/(PGrav + 〈PDE〉) (purple; the dashed line indicates the median, with a summary histogram to the right) with 5th/16th/25th/50th/75th/84th/95th percentile contours.

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