Loire Rosette, Tais (2026) Mapping Quenching Timescales Across the A2142 Cluster Filament. Bachelor's Thesis, Astronomy.
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Abstract
Context: Cosmic filaments are the dominant matter reservoir in the Universe, channelling galaxies towards dense cluster environments. The role of this filamentary environment in driving star formation quenching remains an open question. The well-defined region of the cluster A2142 and the recent release of WEAVE multi-object spectroscopy provide an excellent opportunity to study environmental quenching. Aims: The aim of this thesis is to determine whether the quenching timescale ∆τ = τ99 −τ90 varies systematically with perpendicular distance from the filament axis (Dperp) or with parallel distance along the filament from the cluster centre (Dparallel). Methods: We applied the BESTA Bayesian full spectral fitting framework to WEAVE multi-object spectra of 145 galaxies in the A2142 filament environment, using a non-parametric star formation history model. The quenching timescale ∆τ was derived per galaxy by computing τ99 − τ90 on a per-posterior-sample basis. Composite posterior probability distributions per spatial bin were constructed by stacking normalised individual posteriors, with summary statistics extracted via weighted percentiles. Filament distances were computed in the 2D sky plane. Results: An upward trend in ∆τ with Dperp is visible in the well-sampled inner bins up to Dperp ∼ 3 h−1 Mpc. No systematic gradient is detected along Dparallel. An offset in ∆τ is found between high-mass (log(M⋆/M⊙) ≥ 11) and low-to-intermediate-mass (log(M⋆/M⊙) < 11) galaxies.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Trager, S.C. and Corcho Caballero, P. |
| Degree programme: | Astronomy |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 16 Jul 2026 12:00 |
| Last Modified: | 16 Jul 2026 12:00 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/37429 |
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