A Lyman continuum analysis of $\sim 100$ galaxies at $z_{\mathrm{spec}}\sim 3$ in the Abell 2744 cluster field

Liu, Y. (avtor), Bradač, Maruša (avtor)

Identifying Lyman continuum (LyC) leakers at intermediate redshifts is crucial for understanding the properties of cosmic reionizers because the opacity of the intergalactic medium (IGM) prevents the direct detection of LyC emission from sources during the Epoch of Reionization (EoR). In this study, we confirm two new LyC candidate leakers at ▫$z \sim 3$▫ in the Abell 2744 cluster field, with absolute escape fractions ▫$(f_{\text{esc}})$▫ of ▫$0.83_{-0.80}^{+0.15}$▫ and ▫$0.74_{-0.70}^{+0.23}$▫, respectively. The LyC emission was detected using HST/WFC3/F275W and F336W imaging. These two candidate leakers appear to be faint (▫$M_{\text{UV}} = -17.61 \pm 0.06$▫ and ▫$-18.22 \pm 0.10$▫), exhibit blue UV continuum slopes (▫$\beta = - 2.43 \pm 0.05$▫ and ▫$-1.92 \pm 0.09$▫), have low masses (▫$M_{\ast} \sim 10^{7.51 \pm 0.03}$▫ and ▫$10^{7.17 \pm 0.15}\ M_{\ast}$▫) and Ly▫$\alpha$▫ equivalent widths of ▫$90 \pm 3$▫ Å and ▫$28 \pm 12$▫ Å, respectively. These two LyC candidate leakers were detected in a catalog of 91 spectroscopically confirmed sources using public spectra from the JWST and/or MUSE. We also analyzed properties that were proposed as indirect indicators of LyC emission, such as Ly▫$\alpha$▫, the O32 ratio, and ▫$M_{\ast}$▫. We created a galaxy subsample that was selected according to these properties, stacked the LyC observations of this subsample, and assessed the limits of the escape fractions in the stacks. We aim to enhance our understanding of LyC escape mechanisms and improve our predictions of the LyC ▫$f_{\text{esc}}$▫ during the EoR by analyzing the individual candidates and the stacks in the context of the currently limited sample of known LyC leakers at ▫$z \sim 3$▫.

• Jezik: Angleški jezik
• Ključne besede: galaxy evolution, high-redshift galaxies, star formation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 12 str.
• Številčenje: Vol. 704, art. no. A328
• PID: 20.500.12556/RUL-181938
• UDK: 524.8
• ISSN pri članku: 1432-0746
• DOI: 10.1051/0004-6361/202556410
• COBISS.SI-ID: 275775747
• Datum objave v RUL: 20.04.2026

Gradivo je del revije

• Naslov: Astronomy & astrophysics
• Skrajšan naslov: Astron. astrophys.
• Založnik: EDP Sciences
• ISSN: 1432-0746
• COBISS.SI-ID: 392577

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: galaksije, rdeči premik, nastanek zvezd, nastanek galaksij