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arXiv 2402.17239astro-ph.GAastro-ph.SR
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利用 JWST NIRSpec 研究银河系 0.6–5.3 μm 光学至红外尘埃消光律:Westerlund 2

The Optical to Infrared $0.6-5.3\,{\rm μm}$ Dust Extinction Law of the Milky Way with JWST NIRSpec: Westerlund 2

Shu Wang, Xiaodian Chen

AI总结:

本文利用 JWST 光谱提出配对方法研究银河系 0.6–5.3 μm 消光律,确定红外幂律指数 α=1.98±0.15,并建立适用于 JWST 测光与光谱消光改正的非参数化 α 依赖消光曲线。

摘要:

星际消光律对于解释观测结果和推断星际尘埃颗粒的性质至关重要。基于詹姆斯·韦布空间望远镜(JWST)的 993 条棱镜/CLEAR 光谱,我们研究了 0.6–5.3 μm 波段的星际尘埃消光律。我们提出了一种仅基于 JWST 观测光谱获取红化曲线的配对方法。大多数高消光源朝向年轻星团 Westerlund 2。红外 1.0–5.3 μm 波段的红化曲线与幂律 A_λ∝λ^{-α} 符合得很好。我们确定了 α 的平均值为 α=1.98±0.15,这与银河系的平均值一致。我们发现 α 可能是变化的,并且与 R_V 无关。利用推导出的 α,我们将红化曲线转换为消光曲线,并建立了 0.6–5.3 μm 波长范围内非参数化的、依赖于 α 的消光曲线。在 λ<1 μm 处,推导出的消光律并不能很好地用参数化幂律型曲线来描述。我们的非参数化、依赖于 α 的消光曲线适用于对基于 JWST 的 0.6–5.3 μm 测光和光谱测量进行消光改正。我们还提供了不同 α 值下 JWST NIRCam 各波段的消光系数。

英文摘要:

The interstellar extinction law is important for interpreting observations and inferring the properties of interstellar dust grains. Based on the 993 prism/CLEAR spectra from the James Webb Space Telescope (JWST), we investigate $0.6-5.3\,{\rm μm}$ interstellar dust extinction law. We propose a pair method to obtain the reddening curves based only on JWST observed spectra. Most of the high extinction sources are toward the young star cluster Westerlund 2. The infrared (IR) $1.0-5.3\,{\rm μm}$ reddening curves agree with the power-law $A_λ\propto λ^{-α}$ well. We determine an average value of $α=1.98\pm0.15$, which is consistent with the average value of the Galaxy. We find that $α$ may be variable and independent of $R_{\rm V}$. With the derived $α$, we convert the reddening curves into the extinction curves and establish the non-parameterized $α$-dependent extinction curves in the wavelength range of $0.6-5.3\,{\rm μm}$. At $λ<1\,{\rm μm}$, the derived extinction law is not well described by the parameterized power-law type curve. Our non-parameterized $α$-dependent extinction curves are suitable for the extinction correction of JWST-based photometry and spectra measurements at $0.6-5.3\,{\rm μm}$. We also provide the extinction coefficients for the JWST NIRCam bandpasses with different $α$.

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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