Connecting Lyα and Ionizing Photon Escape in the Sunburst Arc
Abstract
We investigate the Lyα and Lyman continuum (LyC) properties of the Sunburst Arc, a z = 2.37 gravitationally lensed galaxy with a multiply imaged, compact region leaking LyC and a triple-peaked Lyα profile indicating direct Lyα escape. Non-LyC-leaking regions show a redshifted Lyα peak, a redshifted and central Lyα peak, or a triple-peaked Lyα profile. We measure the properties of the Lyα profile from different regions of the galaxy using R ∼ 5000 Magellan/Magellan Echellette spectra. We compare the Lyα spectral properties to LyC and narrowband Lyα maps from Hubble Space Telescope imaging to explore the subgalactic Lyα‑LyC connection. We find strong correlations (Pearson correlation coefficient r > 0.6) between the LyC escape fraction (
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2024
- DOI:
- arXiv:
- arXiv:2410.03660
- Bibcode:
- 2024ApJ...977..234O
- Keywords:
-
- Starburst galaxies;
- Lyman-alpha galaxies;
- Radiative transfer;
- Strong gravitational lensing;
- 1570;
- 978;
- 1335;
- 1643;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Submitted to The Astrophysical Journal with revisions from the first referee report. Comments welcome