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JWST Observations of Starbursts: A Young Bubble in NGC 253’s Central Starburst

  • Authors: Kaitlyn E. Sheriff, Elisabeth A. C. Mills, Xinyu Mai, Utsav Siwakoti, Sara E. Duval, Alberto D. Bolatto, Rebecca C. Levy, Jia Wei Teh, Torsten Böker, Serena A. Cronin, Daniel A. Dale, Keaton Donaghue, Kimberly Emig, Simon C. O. Glover, Rodrigo Herrera-Camus, Ralf S. Klessen, Thomas S.-Y. Lai, Ashley E. Lieber, Laura Lenkić, Sebastian Lopez, David S. Meier, Jüergen Ott, J. D. T. Smith, Yu-Hsuan Teng, Paul P. van der Werf, Sylvain Veilleux, Vicente Villanueva, Rachel Cionitti, Joseph Havens, Maleah Rhem, Nathan Shaw, Kai Smith, Hazel Belfiore Wright, Md Abdullah Al Zaman

Kaitlyn E. Sheriff et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 10.

Reduced χ2 maps from the RADEX modeling using integrated intensities measured over the full CO emission profile. The top panel shows the minimum reduced χ2 as a function of kinetic temperature and H2 density. The modeling constrains the gas density to n(H2) ≳ 103 cm−3, while the kinetic temperature remains largely unconstrained over the explore range. The bottom panel shows the minimum reduced χ2 as a function of CO column density and beam filling factor. A well-defined minimum is found at NCO ≈ 8.9 × 1018 cm−2, with the elongated valley reflecting the degeneracy between CO column density and filling factor.

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