Haro 11: The Spatially Resolved Lyman Continuum Sources
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2024
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| author | Komarova, Lena Oey, M. S. Hernandez, Svea Adamo, Angela Sirressi, Mattia Leitherer, Claus Mas-Hesse, J. M. Ostlin, Goran Hodges-Kluck, Edmund Bik, Arjan Hayes, Matthew J. Jaskot, Anne E. Kunth, Daniel Laursen, Peter Melinder, Jens Rivera-Thorsen, T. Emil |
| author_facet | Komarova, Lena Oey, M. S. Hernandez, Svea Adamo, Angela Sirressi, Mattia Leitherer, Claus Mas-Hesse, J. M. Ostlin, Goran Hodges-Kluck, Edmund Bik, Arjan Hayes, Matthew J. Jaskot, Anne E. Kunth, Daniel Laursen, Peter Melinder, Jens Rivera-Thorsen, T. Emil |
| contents | As the nearest confirmed Lyman continuum (LyC) emitter, Haro 11 is an exceptional laboratory for studying LyC escape processes crucial to cosmic reionization. Our new HST/COS G130M/1055 observations of its three star-forming knots now reveal that the observed LyC originates in Knots B and C, with $903 - 912~Å$ luminosities of $1.9\pm1.5 \times 10^{40}~\rm erg~s^{-1}$ and $0.9\pm0.7 \times 10^{40}~\rm erg~s^{-1}$, respectively. We derive local escape fractions $f_{\rm{esc, 912}} = 3.4\pm2.9\%$ and $5.1\pm4.3\%$ for Knots B and C, respectively. Our Starburst99 modeling shows dominant populations on the order of $\sim1-4$ Myr and $1-2\times10^7 \rm~M_\odot$ in each knot, with the youngest population in Knot B. Thus, the knot with the strongest LyC detection has the highest LyC production. However, LyC escape is likely less efficient in Knot B than in Knot C due to higher neutral gas covering. Our results therefore stress the importance of the intrinsic ionizing luminosity, and not just the escape fraction, for LyC detection. Similarly, the Ly$α$ escape fraction does not consistently correlate with LyC flux, nor do narrow Ly$α$ red peaks. High observed Ly$α$ luminosity and low Ly$α$ peak velocity separation, however, do correlate with higher LyC escape. Another insight comes from the undetected Knot A, which drives the Green Pea properties of Haro 11. Its density-bounded conditions suggest highly anisotropic LyC escape. Finally, both of the LyC-leaking Knots, B and C, host ultra-luminous X-ray sources (ULXs). While stars strongly dominate over the ULXs in LyC emission, this intriguing coincidence underscores the importance of unveiling the role of accretors in LyC escape and reionization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01435 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Haro 11: The Spatially Resolved Lyman Continuum Sources Komarova, Lena Oey, M. S. Hernandez, Svea Adamo, Angela Sirressi, Mattia Leitherer, Claus Mas-Hesse, J. M. Ostlin, Goran Hodges-Kluck, Edmund Bik, Arjan Hayes, Matthew J. Jaskot, Anne E. Kunth, Daniel Laursen, Peter Melinder, Jens Rivera-Thorsen, T. Emil Astrophysics of Galaxies As the nearest confirmed Lyman continuum (LyC) emitter, Haro 11 is an exceptional laboratory for studying LyC escape processes crucial to cosmic reionization. Our new HST/COS G130M/1055 observations of its three star-forming knots now reveal that the observed LyC originates in Knots B and C, with $903 - 912~Å$ luminosities of $1.9\pm1.5 \times 10^{40}~\rm erg~s^{-1}$ and $0.9\pm0.7 \times 10^{40}~\rm erg~s^{-1}$, respectively. We derive local escape fractions $f_{\rm{esc, 912}} = 3.4\pm2.9\%$ and $5.1\pm4.3\%$ for Knots B and C, respectively. Our Starburst99 modeling shows dominant populations on the order of $\sim1-4$ Myr and $1-2\times10^7 \rm~M_\odot$ in each knot, with the youngest population in Knot B. Thus, the knot with the strongest LyC detection has the highest LyC production. However, LyC escape is likely less efficient in Knot B than in Knot C due to higher neutral gas covering. Our results therefore stress the importance of the intrinsic ionizing luminosity, and not just the escape fraction, for LyC detection. Similarly, the Ly$α$ escape fraction does not consistently correlate with LyC flux, nor do narrow Ly$α$ red peaks. High observed Ly$α$ luminosity and low Ly$α$ peak velocity separation, however, do correlate with higher LyC escape. Another insight comes from the undetected Knot A, which drives the Green Pea properties of Haro 11. Its density-bounded conditions suggest highly anisotropic LyC escape. Finally, both of the LyC-leaking Knots, B and C, host ultra-luminous X-ray sources (ULXs). While stars strongly dominate over the ULXs in LyC emission, this intriguing coincidence underscores the importance of unveiling the role of accretors in LyC escape and reionization. |
| title | Haro 11: The Spatially Resolved Lyman Continuum Sources |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.01435 |