Ionization by Massive Young Clusters as Revealed by Ionization-Parameter Mapping
Abstract
Ionization-parameter mapping (IPM) is a powerful technique for tracing the optical depth of Lyman continuum radiation from massive stars. Using narrow-band line-ratio maps, we examine trends in radiative feedback from ordinary HII regions of the Magellanic Clouds and nearby starburst galaxies. We find that the aggregate escape fraction for the Lyman continuum is sufficient to ionize the diffuse, warm ionized medium in the Magellanic Clouds, and that more luminous nebulae are more likely to be optically thin. We apply ionization-parameter mapping to entire starburst galaxies, revealing ionization cones in two nearby starbursts. Within the limits of our small sample, we examine the conditions for the propagation of ionizing radiation beyond the host galaxies.
Keywords
Cite
@article{arxiv.1401.5779,
title = {Ionization by Massive Young Clusters as Revealed by Ionization-Parameter Mapping},
author = {M. S. Oey and E. W. Pellegrini and J. Zastrow and A. E. Jaskot},
journal= {arXiv preprint arXiv:1401.5779},
year = {2014}
}
Comments
Invited paper to appear in "Massive Young Star Clusters Near and Far: From the Milky Way to Reionization", 2013 Guillermo Haro Conference, Eds. Y. D. Mayya, D. Rosa-Gonzalez & E. Terlevich, INAOE and AMC. 6 pages, 4 figures