Universe最新文献_第9页

Molecular Formation in Low-Metallicity Hot Cores 低金属性热核中的分子形成

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-07-04 DOI: 10.3390/universe10070290

Yara Sobhy, Hideko Nomura, Tetsuo Yamamoto, Osama Shalabeia

引用次数: 0

On the Nature of the Radio Calibrator and Gamma-Ray Emitting NLS1 Galaxy 3C 286 and Its Multiwavelength Variability 论射电校准器和伽马射线发射 NLS1 星系 3C 286 的性质及其多波长变异性

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-07-02 DOI: 10.3390/universe10070289

S. Komossa, S. Yao, D. Grupe, A. Kraus

{"title":"On the Nature of the Radio Calibrator and Gamma-Ray Emitting NLS1 Galaxy 3C 286 and Its Multiwavelength Variability","authors":"S. Komossa, S. Yao, D. Grupe, A. Kraus","doi":"10.3390/universe10070289","DOIUrl":"https://doi.org/10.3390/universe10070289","url":null,"abstract":"The quasar 3C 286, a well-known calibrator source in radio astronomy, was found to exhibit exceptional multiwavelength properties. Its rich and complex optical emission-line spectrum revealed its narrow-line Seyfert 1 (NLS1) nature. Given its strong radio emission, this makes 3C 286 one of the radio-loudest NLS1 galaxies known to date. 3C 286 is also one of very few known compact steep-spectrum (CSS) sources detected in the gamma-ray regime. Observations in the X-ray regime, rarely carried out so far, revealed evidence for variability, raising the question whether it is driven by the accretion disk or jet. 3C 286 is also well known for its damped Lyman alpha system from an intervening absorber at z = 0.692, triggering a search for the corresponding X-ray absorption along the line-of-sight. Here, we present new observations in the radio, X-ray, optical, and UV bands. The nature of the X-ray variability is addressed. Spectral evidence suggests that it is primarily driven by the accretion disk (not the jet), and the X-ray spectrum is well fit by a powerlaw plus soft excess model. The radio flux density and polarization remain constant at the Effelsberg telescope resolution, reconfirming the use of 3C 286 as radio calibrator. The amount of reddening/absorption along the line-of-sight intrinsic to 3C 286 is rigorously assessed. None is found, validating the derivation of a high Eddington ratio (L/LEdd∼ 1) and of the very high radio-loudness index of 3C 286. Based on the first deep Chandra image of 3C 286, tentative evidence for hard X-ray emission from the SW radio lobe is reported. A large variety of models for the gamma-ray emission of 3C 286 are briefly discussed.","PeriodicalId":48646,"journal":{"name":"Universe","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mono-Higgs and Mono-Z Production in the Minimal Vector Dark Matter Model 最小矢量暗物质模型中的单希格斯和单Z生产

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-07-02 DOI: 10.3390/universe10070288

Gonzalo Benítez-Irarrázabal, Alfonso Zerwekh

引用次数: 0

Energetic Particles and High-Energy Processes in Cosmological Filaments and Their Astronomical Implications 宇宙学细丝中的高能粒子和高能过程及其天文学意义

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-07-01 DOI: 10.3390/universe10070287

Kinwah Wu, Ellis R. Owen, Qin Han, Yoshiyuki Inoue, Lilian Luo

{"title":"Energetic Particles and High-Energy Processes in Cosmological Filaments and Their Astronomical Implications","authors":"Kinwah Wu, Ellis R. Owen, Qin Han, Yoshiyuki Inoue, Lilian Luo","doi":"10.3390/universe10070287","DOIUrl":"https://doi.org/10.3390/universe10070287","url":null,"abstract":"Large-scale cosmic filaments connect galaxies, clusters, and voids. They are permeated by magnetic fields with a variety of topologies. Cosmic rays with energies up to 1020eV can be produced in astrophysical environments associated with star-formation and AGN activities. The fate of these cosmic rays in filaments, which cannot be directly observed on Earth, are rarely studied. We investigate the high-energy processes associated with energetic particles (cosmic rays) in filaments, adopting an ecological approach that includes galaxies, clusters/superclusters, and voids as key cosmological structures in the filament ecosystem. We derive the phenomenology for modelling interfaces between filaments and these structures, and investigate how the transfer and fate of energetic cosmic ray protons are affected by the magnetism of the interfaces. We consider different magnetic field configurations in filaments and assess the implications for cosmic ray confinement and survival against hadronic pion-producing and photo-pair interactions. Our analysis shows that the fate of the particles depends on the location of their origin within a filament ecosystem, and that filaments act as ‘highways’, channelling cosmic rays between galaxies, galaxy clusters, and superclusters. Filaments can also operate as cosmic ‘fly paper’, capturing cosmic ray protons with energies up to 1018eV from cosmic voids. Our analysis predicts the presence of a population of ∼1012–1016eV cosmic ray protons in filaments and voids accumulated continually over cosmic time. These protons do not suffer significant energy losses through photo-pair or pion production, nor can they be cooled efficiently. Instead, they form a cosmic ray fossil record of the power generation history of the Universe.","PeriodicalId":48646,"journal":{"name":"Universe","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

X17: Status and Perspectives X17：现状与展望

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-29 DOI: 10.3390/universe10070285

Carlo Gustavino

引用次数: 0

Further Study of the Relationship between Transient Effects in Energetic Proton and Cosmic Ray Fluxes Induced by Coronal Mass Ejections 进一步研究日冕物质抛射诱发的高能质子和宇宙射线通量的瞬态效应之间的关系

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-29 DOI: 10.3390/universe10070283

Mihailo Savić, Nikola Veselinović, Darije Maričić, Filip Šterc, Radomir Banjanac, Miloš Travar, Aleksandar Dragić

{"title":"Further Study of the Relationship between Transient Effects in Energetic Proton and Cosmic Ray Fluxes Induced by Coronal Mass Ejections","authors":"Mihailo Savić, Nikola Veselinović, Darije Maričić, Filip Šterc, Radomir Banjanac, Miloš Travar, Aleksandar Dragić","doi":"10.3390/universe10070283","DOIUrl":"https://doi.org/10.3390/universe10070283","url":null,"abstract":"The study and better understanding of energetic transient phenomena caused by disturbances occurring on our Sun are of great importance, primarily due to the potential negative effects those events can have on Earth’s environment. Here, we present the continuation of our previous work on understanding the connection between disturbances in the flux of energetic particles induced in the near-Earth environment by the passage of interplanetary coronal mass ejections and related Forbush decrease events. The relationship between the shape of fluence spectra of energetic protons measured by the instruments on the SOHO/ERNE probe at Lagrange point L1, Forbush decrease parameters measured by the worldwide network of neutron monitors, and coronal mass ejection parameters measured in situ is investigated. Various parameters used to characterize transient phenomena and their impact on the heliosphere, provided by the WIND spacecraft, were utilized to improve the accuracy of the calculation of the associated energetic proton fluence. The single and double power laws with exponential rollover were used to model the fluence spectra, and their effectiveness was compared. Correlation analysis between exponents used to characterize the shape of fluence spectra and Forbush decrease parameters is presented, and the results obtained by the two models are discussed.","PeriodicalId":48646,"journal":{"name":"Universe","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Introduction to the Number of e-Folds in Slow-Roll Inflation 慢卷膨胀中的电子褶皱数介绍

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-29 DOI: 10.3390/universe10070284

Alessandro Di Marco, Emanuele Orazi, Gianfranco Pradisi

引用次数: 0

Galaxy Group Ellipticity Confirms a Younger Cosmos 星系群椭圆度证实宇宙更年轻

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-29 DOI: 10.3390/universe10070286

Yu Rong

引用次数: 0

Quantized p-Form Gauge Field in D-Dimensional de Sitter Spacetime D 维德西特时空中的量化 p 形量子场

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-28 DOI: 10.3390/universe10070281

Emanuel W. D. Dantas, Geová Alencar, Ilde Guedes, Milko Estrada

引用次数: 0

The cos 2ϕh Asymmetry in K± Mesons and the Λ-Hyperon-Produced SIDIS Process at Electron Ion Colliders K± 介子中的 cos 2ϕh 不对称和电子离子对撞机上的Λ-氙产生的 SIDIS 过程

IF 2.9 4区物理与天体物理

Universe Pub Date : 2024-06-28 DOI: 10.3390/universe10070280

Jianxi Song, Yanli Li, Shi-Chen Xue, Hui Li, Xiaoyu Wang

{"title":"The cos 2ϕh Asymmetry in K± Mesons and the Λ-Hyperon-Produced SIDIS Process at Electron Ion Colliders","authors":"Jianxi Song, Yanli Li, Shi-Chen Xue, Hui Li, Xiaoyu Wang","doi":"10.3390/universe10070280","DOIUrl":"https://doi.org/10.3390/universe10070280","url":null,"abstract":"We investigate the cos2ϕh azimuthal asymmetry contributed by the coupling of the Boer–Mulders function and the Collins function in K±- and Λ-hyperon-produced SIDIS process. The asymmetry is studied under the transverse-momentum-dependent (TMD) factorization framework at the leading order by considering the TMD evolution effects that utilize the parametrization for non-perturbative Sudakov form factors. The DGLAP evolution effects of the collinear counterpart of the Collins function of the final-state hadrons are considered by introducing the approximated evolution kernels. We utilize the available parametrization for the proton Boer–Mulders function and the Collins function of K±. For the Collins function of the Λ hyperon, the result of the diquark spectator model is adopted due to the absence of parametrization. The numerical results of the cos2ϕh azimuthal asymmetry are obtained in the kinematic regions of EIC and EicC. It can be shown that the asymmetry is much smaller than the Sivers asymmetry, which means that the convolution of the Boer–Mulders function and the Collins function may not be the main contributor to the cos2ϕh asymmetry. We emphasize the importance of future measurement of the cos2ϕh asymmetry to unravel different contributors.","PeriodicalId":48646,"journal":{"name":"Universe","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0