Lensed SLSN 2025wny at z=2.0155 Matches Local Magnetar-Driven Events in UV Spectra and Light Curve
Observations of lensed SLSN 2025wny demonstrate that magnetar-powered explosions and associated galactic outflows at z=2 remain consistent with local analogs, supporting uniform feedback physics across cosmic time. Larger samples from LSST and Roman are needed to probe rare variants or subtle evolutionary trends.
Hoogendam et al. obtained KCWI spectra spanning 11-61 days post-maximum and Pan-STARRS photometry yielding magnification μ_A=19.4±1.6. MOSFiT modeling reproduced the light curve with B=2.4×10^14 G and an additional late-time power source, while narrow ISM lines indicated sub-solar metallicity and high-velocity outflows of 575 km s^-1 with Lyα escape fraction 0.23. These data test whether extreme stellar deaths and galaxy feedback operate identically at cosmic noon. The result implies that SLSN-I progenitors and explosion physics show no strong redshift evolution out to z=2, tightening constraints on massive-star populations in low-metallicity environments that dominate early-universe star formation. Upcoming wide-field surveys will enlarge the sample, but current single-event statistics leave open whether rare subpopulations or selection effects alter the apparent consistency. A volume-limited high-z SLSN census reaching tens of events would be required to detect population-level deviations at 3σ.
LSST: At least 15 spectroscopically confirmed SLSNe at z>1.5 discovered within 36 months of full operations starting 2025.
Sources (2)
- [1]Primary Source(https://arxiv.org/abs/2610.08903)
- [2]Supporting Source(https://arxiv.org/abs/2305.04943)