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arXiv 2507.03412astro-ph.COastro-ph.GA
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SKYSURF IX -- 从集成星系光测量中获得的宇宙光学和近红外背景

SKYSURF IX -- The Cosmic Optical and Infrared Background from Integrated Galaxy Light Measurements

International Centre for Radio Astronomy Research (ICRAR), University of Western Australia(国际无线电天文研究中心,西澳大利亚大学);School of Earth and Space Exploration, Arizona State University(地球与空间探索学院,亚利桑那州立大学)
Scott A. Tompkins, Simon P. Driver, Aaron S. G. Robotham, Rogier A. Windhorst, Delondrae Carter, Timothy Carleton, Zak Goisman, Daniel Henningsen, Luke J. Davie… 展开作者

Scott A. Tompkins, Simon P. Driver, Aaron S. G. Robotham, Rogier A. Windhorst, Delondrae Carter, Timothy Carleton, Zak Goisman, Daniel Henningsen, Luke J. Davies, Sabine Bellstedt, Jordan C. J. D'Silva, Juno Li, Seth H. Cohen, Rolf A. Jansen, Rosalia O'Brien, Anton M. Koekemoer, Norman Grogin, John MacKenty

AI总结:

SKYSURF IX利用HST数据首次测量了0.59μm处的集成星系光,并确定了宇宙光学背景值,表明COB主要来自星系内部过程。

摘要:

作为SKYSURF哈勃空间望远镜(HST)遗产存档计划的一部分,我们提出了星系数量计数,从而获得了15个不同波长的超星系背景光(EBL)测量值。我们已将82,752张HST图像在23个滤光片上处理成16,686个拼接图,使用相同的软件和处理流程。使用17/23个提供可靠星系计数的滤光片,我们通过结合8个来自WAVES(宽视场星系巡天)和DEVILS(深星系可见遗产巡天)的波段,对集成星系光(IGL)进行了约束,其误差在0.3至1.6μm之间为1.5%-9%。尽管HST从未被设计用于大范围巡天,但通过广泛的质控和过滤,我们能够提取出一个可靠且具有代表性的分布在天空上的场样本。我们的最终目录覆盖了约19.6平方度的总面积,单个滤光片覆盖的面积范围从约0.16至7.0平方度不等。众多独立视线和覆盖面积的结合使我们能够将深数量计的宇宙方差不确定性降至0.06%-1.8%。首次利用HST数据,我们能够确定在0.59μm处的IGL测量值为9.07±0.35nW m⁻² sr⁻¹。我们获得了宇宙光学背景值为24.45±0.50nW m⁻² sr⁻¹。不同测量COB(宇宙光学背景)的技术,无论是直接还是间接,最近都趋于一致,表明COB几乎完全来自星系内部的过程。这与最近由New Horizons和极高能(VHE)约束报告的值相结合,使来自银河系以外的弥散发射几乎没有空间。

英文摘要:

As part of the SKYSURF Hubble Space Telescope (HST) Legacy Archival program we present galaxy number counts which yield measurements of the extragalactic background light (EBL) at 15 different wavelengths. We have processed 82,752 HST images across 23 filters into 16,686 mosaics using the same software and processing pipeline throughout. Using 17/23 filters that give reliable galaxy counts, we constrain the integrated galaxy light (IGL) with a 1.5-9\% error between 0.3 and 1.6 $μ$m in combination with 8 bands from WAVES (Wide Area VISTA Extragalactic Survey) and DEVILS (Deep Extragalactic Visible Legacy Survey). While HST was never intended to undertake large area surveys, through extensive quality control and filtering, we were able to extract a reliable and representative sample of fields distributed across the sky. Our final catalogs cover a combined $\approx 19.6 °^2$, with individual filters covering areas ranging from $\approx 0.16-7.0 °^2$. The combination of numerous independent sight-lines and area coverage allows us to reduce cosmic variance uncertainties in deep number counts to 0.06\%-1.8\%. For the first time we are able to establish a measurement of the IGL, $\mathrm{9.07 \pm 0.35 nW m^{-2} sr^{-1}}$, at 0.59 $μ$m using HST data. We obtain a cosmic optical background value of $ 24.45 \pm 0.50 \mathrm{nW m^{-2} sr^{-1}}$. Different techniques used to measure the COB, both directly and indirectly, have recently converged indicating that the COB arises almost exclusively from processes within galaxies. This in combination with the recent values reported from New Horizons and very high energy (VHE) constraints leaves very little room for any diffuse emission coming from outside the Milky Way.

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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