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arXiv 2512.19783astro-ph.COastro-ph.HE
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SN 2025ogs:一个红移z=2的光谱正常Ia型超新星作为红移演化基准

SN 2025ogs: A Spectroscopically-Normal Type Ia Supernova at z = 2 as a Benchmark for Redshift Evolution

Space Telescope Science Institute(太空望远镜科学研究所);Johns Hopkins University(约翰斯·霍普金斯大学);University of Arizona(亚利桑那大学);Oklahoma State University(俄克拉荷马州立大学);University of California, Santa Cruz(加利福尼亚大学圣克鲁兹分校)
M. R. Siebert, J. D. R. Pierel, M. Engesser, D. A. Coulter, C. Decoursey, O. D. Fox, A. Rest, W. Chen, J. M. Derkacy, E. Egami, R. J. Foley, D. O. Jones, K. Kak… 展开作者

M. R. Siebert, J. D. R. Pierel, M. Engesser, D. A. Coulter, C. Decoursey, O. D. Fox, A. Rest, W. Chen, J. M. Derkacy, E. Egami, R. J. Foley, D. O. Jones, K. Kakiichi, A. M. Koekemoer, Z. G. Lane, C. Larison, D. C. Leonard, T. J. Moriya, E. Padilla Gonzalez, R. M. Quimby, K. Shukawa, L. G. Strolger, Y. Zenati

AI总结:

SN 2025ogs在z=2.05的红移下表现出正常Ia型超新星特性,其光谱和光变曲线符合标准模型,为未来高红移Ia型超新星样本提供基准,验证了Ia型超新星标准化在高红移下的稳定性。

摘要:

罗马空间望远镜将提供宇宙膨胀动力学的革命性测量,从暗物质和暗能量驱动的宇宙扩展到z≈3。这种测量的准确性基于假设标准化Ia型超新星(SN Ia)的亮度不随红移而变化。如果存在,SN Ia亮度的演变最可能在暗物质主导的宇宙时期(z≥1.5)被检测到,其影响在更高的红移下更容易与暗能量变化区分开来。我们呈现了SN 2025ogs的JWST NIRCam和NIRSpec观测结果,这是一颗红移z=2.05±0.01的正常Ia型超新星。该SN为解释未来高红移Ia型超新星样本提供了关键的比较点。NIRCam光变曲线显示了蓝色颜色(B-V=-0.27±0.06 mag)和中等快速下降(Δm15(B)=1.55±0.15 mag),这些都在标准标准中符合宇宙学分析的纳入标准。其光度距离与标准平坦ΛCDM模型在1.0σ范围内一致,也与当前从暗能量调查(DES 5年)和Pantheon+的宇宙学约束一致。NIRSpec光谱显示了所有正常Ia型超新星在峰值亮度时观察到的典型吸收特征。我们发现,静止帧光学颜色、静止帧近紫外性质和Si II线强度都与从光变曲线推断出的中等快速下降一致。多个吸收特征(Ca II H&K、O I λ7774和Ca II NIR三重体)都出现在相对于低z SNe Ia样本的较低蓝移。这些结果表明,Ia型超新星标准化在z≈2时仍然稳健,并突显了JWST光谱学在揭示可能影响罗马高精度宇宙学的演变效应的重要性。

英文摘要:

The Nancy Grace Roman Space Telescope will provide a revolutionary measurement of the Universe's expansion kinematics, driven by dark matter and dark energy, out to $z \approx 3$. The accuracy of this measurement is predicated on the assumption that standardized Type Ia supernova (SN Ia) luminosities do not evolve with redshift. If present, SN Ia luminosity evolution is expected to be most detectable in the dark matter-dominated era of the Universe ($z \gtrsim 1.5$), with its effects becoming more easily distinguishable from dark energy variation at increasing redshift. We present JWST NIRCam and NIRSpec observations of SN 2025ogs, a normal SN Ia at $z=2.05\pm 0.01$. This SN offers a key point of comparison for interpreting future high-redshift SN Ia samples. The NIRCam light curve indicates a blue color ($B - V = -0.27 \pm 0.06$ mag) and a moderately fast decline ($Δm_{15}(B) = 1.55 \pm 0.15$ mag), both within standard criteria for inclusion in cosmological analyses. Its luminosity distance is in $1.0σ$ agreement with a standard flat $Λ$CDM model, as well as with current cosmological constraints from the Dark Energy Survey (DES 5yr) and Pantheon+. The NIRSpec spectrum displays all of the hallmark absorption features of a normal SN Ia observed at peak brightness. We find that the rest-frame optical color, rest-frame near-ultraviolet properties, and Si II line strengths are all consistent with the moderately fast decline inferred from the light curve. Multiple absorption features (Ca II H&K, O I $\lambda7774$, and the Ca II NIR triplet) all appear at a lower blueshift relative to a sample of low-$z$ SNe Ia. Together, these results suggest that SN Ia standardization remains robust at $z \approx 2$, and also highlight the importance of JWST spectroscopy for uncovering evolutionary effects that could impact Roman's high-precision cosmology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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