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基于JWST中红外观测数据的X-Complex小行星物理性质反演研究
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作者 矫恒越 徐小萌 +4 位作者 徐天弈 吴昀昭 金岩 张海波 刘志军 《空间控制技术与应用》 北大核心 2025年第5期16-25,共10页
X-complex小行星是一类在可见光-近红外波段无诊断性光谱特征、成分类型多样的重要天体,其中部分可能是已分异天体金属核心残余,是太阳系早期热演化研究及太空采矿的重要目标对象.由于Xcomplex小行星在可见光-近红外波段范围缺乏光谱吸... X-complex小行星是一类在可见光-近红外波段无诊断性光谱特征、成分类型多样的重要天体,其中部分可能是已分异天体金属核心残余,是太阳系早期热演化研究及太空采矿的重要目标对象.由于Xcomplex小行星在可见光-近红外波段范围缺乏光谱吸.收特征,热红外高光谱是研究X-complex小行星的重要手段.基于韦布空间望远镜中红外观测数据对7颗物理性质尚不明确的X-complex小行星进行了研究,利用近地小行星热模型及马尔科夫链蒙特卡洛方法反演了它们的发射率、直径、热集束参数以及几何反照率等物理信息.相较于以往观测,本文充分利用韦布空间望远镜的红外高光谱优势,通过连续谱段数据约束模型,提高了反演结果的可靠性.结果显示,这7颗小行星的直径范围为17.30~22.55 km,比喷气推进实验室数据库结果平均偏小41.5%,表明以往对小尺寸X-complex小行星直径存在普遍高估,进而反映其实际表面几何反照率普遍高于既有认知.反演的红外发射率光谱显示它们比硅酸盐小行星发射率低0.064~0.093,暗示它们表面可能被低发射率物质覆盖.所有小行星的中红外发射率光谱均展示了光谱特征,进一步印证了反演结果的可靠性. 展开更多
关键词 小行星 jwst 热物理模型 X-complex小行星 红外高光谱
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JWST Discoveries and the Hypersphere World-Universe Model: Transformative New Cosmology
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作者 Vladimir S. Netchitailo 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第4期1806-1834,共29页
Twenty-six years ago, a small committee report built upon earlier studies to articulate a compelling and poetic vision for the future of astronomy. This vision called for an infrared-optimized space telescope with an ... Twenty-six years ago, a small committee report built upon earlier studies to articulate a compelling and poetic vision for the future of astronomy. This vision called for an infrared-optimized space telescope with an aperture of at least four meters. With the support of their governments in the US, Europe, and Canada, 20,000 people brought this vision to life as the 6.5-meter James Webb Space Telescope (JWST). The telescope is working perfectly, delivering much better image quality than expected [1]. JWST is one hundred times more powerful than the Hubble Space Telescope and has already captured spectacular images of the distant universe. A view of a tiny part of the sky reveals many well-formed spiral galaxies, some over thirteen billion light-years away. These observations challenge the standard Big Bang Model (BBM), which posits that early galaxies should be small and lack well-formed spiral structures. JWST’s findings are prompting scientists to reconsider the BBM in its current form. Throughout the history of science, technological advancements have led to new results that challenge established theories, sometimes necessitating their modification or even abandonment. This happened with the geocentric model four centuries ago, and the BBM may face a similar reevaluation as JWST provides more images of the distant universe. In 1937, P. Dirac proposed the Large Number Hypothesis and the Hypothesis of Variable Gravitational Constant, later incorporating the concept of Continuous Creation of Matter in the universe. The Hypersphere World-Universe Model (WUM) builds on these ideas, introducing a distinct mechanism for matter creation. WUM is proposed as an alternative to the prevailing BBM. Its main advantage is the elimination of the “Initial Singularity” and “Inflation”, offering explanations for many unresolved problems in Cosmology. WUM is presented as a natural extension of Classical Physics with the potential to bring about a significant transformation in both Cosmology and Classical Physics. Considering JWST’s discoveries, WUM’s achievements, and 87 years of Dirac’s proposals, it is time to initiate a fundamental transformation in Astronomy, Cosmology, and Classical Physics. The present paper is a continuation of the published article “JWST Discoveries—Confirmation of World-Universe Model Predictions” [2] and a summary of the paper “Hypersphere World-Universe Model: Digest of Presentations John Chappell Natural Philosophy Society” [3]. Many results obtained there are quoted in the current work without full justification;interested readers are encouraged to view the referenced papers for detailed explanations. 展开更多
关键词 World-Universe Model jwst Discoveries Universe-Created Matter Gravity GRAVITOMAGNETISM Wave-Particle Duality Hubble Tension Stretching of World Dark Epoch Luminous Epoch Axis of Evil
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Are James Webb Space Telescope Observations Consistent with Warm Dark Matter?
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作者 Bruce Hoeneisen 《International Journal of Astronomy and Astrophysics》 2024年第1期45-60,共16页
We compare observed with predicted distributions of galaxy stellar masses M<sub>* </sub>and galaxy rest-frame ultra-violet luminosities per unit bandwidth L<sub>UV</sub>, in the redsh... We compare observed with predicted distributions of galaxy stellar masses M<sub>* </sub>and galaxy rest-frame ultra-violet luminosities per unit bandwidth L<sub>UV</sub>, in the redshift range z=2 to 13. The comparison is presented as a function of the comoving warm dark matter free-streaming cut-off wavenumber k<sub>fs</sub>. For this comparison the theory is a minimal extension of the Press-Schechter formalism with only two parameters: the star formation efficiency, and a proportionality factor between the star formation rate per galaxy and LUV</sub>. These two parameters are fixed to their values obtained prior to the James Webb Space Telescope (JWST) data. The purpose of this comparison is to identify if, and where, detailed astrophysical evolution is needed to account for the new JWST observations. 展开更多
关键词 James Webb Space Telescope jwst Warm Dark Matter
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Dark Stars: Supermassive and Ultramassive Dark Macroobjects
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作者 Vladimir S. Netchitailo 《Journal of High Energy Physics, Gravitation and Cosmology》 2023年第4期1021-1043,共23页
R. Genzel and A. Ghez were awarded the 2020 Nobel Prize in Physics for their discovery that Sgr A* is a supermassive compact object, for which Supermassive Black Hole (SBH) was the only accepted explanation. In 2013, ... R. Genzel and A. Ghez were awarded the 2020 Nobel Prize in Physics for their discovery that Sgr A* is a supermassive compact object, for which Supermassive Black Hole (SBH) was the only accepted explanation. In 2013, we proposed a principally different explanation of supermassive compact objects: “Macroobjects of the World have cores made up of the discussed DM particles. Other particles, including DM and baryonic matter, form shells surrounding the cores” [1]. According to the developed Hypersphere World-Universe Model (WUM), the World consists of Dark Matter (about 92.8% of the total Matter) and Ordinary matter (about 7.2%). It means that Dark Matter (DM) should play the main role in any Cosmological model. It is the case in WUM, and Ordinary matter is a byproduct of Dark Matter Particles (DMPs) self-annihilation. In present paper, we discuss Dark Stars, Supermassive and Ultramassive Dark Macroobjects in frames of WUM. 展开更多
关键词 World-Universe Model Dark Stars SUPERCLUSTERS Multicomponent Dark Matter Explosive Volcanic Rotational Fission Angular Momentum jwst Discoveries
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“哈勃”继任者研发步伐加快
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《科技新时代(上半月)》 2007年第6期36-37,共2页
升空已近17年的“哈勃”望远镜为人类的太空探索立下了不朽的功勋,但由于年事已高,近年来不断出现各种故障,因此科学界更加关注它的继任者——“詹姆斯·韦伯(JWST)”太空望远镜的建造进程。
关键词 “哈勃”望远镜 太空望远镜 研发 技术 制造 太空探索 人类 升空 “詹姆斯·韦伯(jwst)”
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高处不胜寒
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作者 谢懿 《太空探索》 2007年第3期20-23,共4页
一架望远镜在太空中年久失修,另一架则在地面上泥足深陷。马蒂亚斯·芒顿(Mattias Mountain)这位被每个人都看好的空间望远镜的新掌门人任重而道远。
关键词 空间望远镜研究所 马蒂亚斯·芒顿 哈勃空间望远镜 空间天文学 jwst空间望远镜
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超轻量镜面系统的研制 被引量:1
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作者 许金鑫 郭伟远 《天文研究与技术》 CSCD 北大核心 2008年第2期192-198,共7页
空间望远镜的研制一直要求系统的轻量化,美国宇航局(NASA)最近研制的韦伯太空望远镜,其主镜系统面密度相对于哈勃空间望远镜已大幅减轻。在韦伯望远镜主镜系统的研制过程中,NASA开展了一系列关于超轻量镜面系统的验证计划,多家机构拿出... 空间望远镜的研制一直要求系统的轻量化,美国宇航局(NASA)最近研制的韦伯太空望远镜,其主镜系统面密度相对于哈勃空间望远镜已大幅减轻。在韦伯望远镜主镜系统的研制过程中,NASA开展了一系列关于超轻量镜面系统的验证计划,多家机构拿出多个方案参与竞标。本文选取几个比较典型的方案,介绍这些镜面系统的设计思想、结构、材料、加工以及相关测试结果,期望能对国内相关方面的工作提供参考。 展开更多
关键词 空间望远镜 超轻量镜面系统 韦伯望远镜
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新知
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《中国国家天文》 2025年第4期12-15,共4页
JWST揭示“宁宙龙卷风”真实面目韦布空间望远镜(James Webb Space Telescope,JWST)近日捕捉到一幕惊艳的场景:在近邻的恒星形成区赫比格-哈罗49/50(Herbig-Haro 49/50,HH 49/50)喷流前方,恰好能够观测到一个遥远的旋涡星系。尽管两者... JWST揭示“宁宙龙卷风”真实面目韦布空间望远镜(James Webb Space Telescope,JWST)近日捕捉到一幕惊艳的场景:在近邻的恒星形成区赫比格-哈罗49/50(Herbig-Haro 49/50,HH 49/50)喷流前方,恰好能够观测到一个遥远的旋涡星系。尽管两者在空间中毫无关联,但这一巧合为天文学家提供了一个研究该活跃区域的机会。 展开更多
关键词 jwst James Webb Space Telescope
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Footprints of axion-like particle in pulsar timing array data and James Webb Space Telescope observations
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作者 Shu-Yuan Guo Maxim Khlopov +3 位作者 Xuewen Liu Lei Wu Yongcheng Wu Bin Zhu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2024年第11期55-62,共8页
Several pulsar timing array(PTA) collaborations have recently reported the evidence for a stochastic gravitational-wave background(SGWB), which can unveil the formation of primordial seeds of inhomogeneities in the ea... Several pulsar timing array(PTA) collaborations have recently reported the evidence for a stochastic gravitational-wave background(SGWB), which can unveil the formation of primordial seeds of inhomogeneities in the early universe. With the SGWB parameters inferred from PTAs data, we can make a prediction of the seeds for early galaxy formation from the domain walls in the axion-like particles(ALPs) field distribution. This also naturally provides a solution to the observation of high redshifts by the James Webb Space Telescope. The predicted photon coupling of the ALP is within the reach of future experimental searches. 展开更多
关键词 stochastic gravitational-wave background pulsar timing array axion-like particle jwst
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