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The H II Regions’ Molecular Law of Star Formation

  • Authors: Daniela Calzetti, Drew Lapeer, Robert C. Kennicutt, Bruce Elmegreen, Sean T. Linden, Mark R. Krumholz, Angela Adamo, Daniel A. Dale, Karin Sandstrom, Giacomo Bortolini, Michele Cignoni, Matteo Correnti, Ana Duarte-Cabral, Helena Faustino Vieira, John S. Gallagher, Kathryn Grasha, Mark Heyer, Leslie K. Hunt, Kelsey E. Johnson, Ralf S. Klessen, Thomas S.-Y. Lai, Desika Narayanan, Göran Östlin, Alex Pedrini, Elena Sabbi, John-David T. Smith, Linda J. Smith, Monica Tosi, Varun Bajaj, Martha Boyer, Tony D. Weinbeck

Daniela Calzetti et al 2026 The Astrophysical Journal 1008 .

  • Provider: AAS Journals

Caption: Figure 13.

The ratio of diffuse-to-H II region Hα emission for the sources in our sample, shown in different color symbols for the different galaxies (teal = NGC 628; magenta = NGC 5194; dark red = NGC 5236). Both the diffuse and H II region Hα have been corrected for dust attenuation, using the Hα/Paα recombination line ratio. The stochastic sampling limit is marked by the vertical dashed black line. The solid black line marks the y ∝ −x trend, in log–log scale, expected if the diffuse emission is roughly constant; this line is not a fit to the data.

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