Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)最新文献_第8页

Detector optimization and observation plan of the CRAFFT project for the next generation UHECR observation craft项目下一代UHECR观测的探测器优化与观测计划

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-16 DOI: 10.22323/1.444.0329

Y. Tameda

{"title":"Detector optimization and observation plan of the CRAFFT project for the next generation UHECR observation","authors":"Y. Tameda","doi":"10.22323/1.444.0329","DOIUrl":"https://doi.org/10.22323/1.444.0329","url":null,"abstract":"The CRAFFT (Cosmic Ray Air Fluorescence Fresnel lens Telescope) project is developing a simple fluorescence detector for the next generation of ultra-high energy cosmic ray observation, which is similar to the concept of the Global Cosmic Ray Observatory for example. Beyond the Telescope Array or Pierre Auger Observatory, it is inevitable to expand the scale of the experiment. The key concept of the CRAFFT detector consists of mass composition sensitivity and low-cost production and operation. The CRAFFT detector is a simple structure fluorescence detector with a Fresnel lens and has fewer photomultiplier tubes than conventional fluorescence detectors. We have already successfully detected air showers with the prototype of the CRAFFT detector and optimized it for improved shower reconstruction and a larger field of view per detector. We are also planning to conduct test observations with the optimized detector to confirm the observation concept. In this contribution, we will report the current status of our project, the details of the optimized detector configuration, and future plans and preparations to confirm our observation concept.","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129150745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

X-ray observation of HESS J1809-193: indication of an X-ray halo and implication for its gamma-ray origin HESS J1809-193的x射线观测:x射线晕的指示及其伽玛射线起源的含义

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-16 DOI: 10.22323/1.444.0561

Chao-ming Li

{"title":"X-ray observation of HESS J1809-193: indication of an X-ray halo and implication for its gamma-ray origin","authors":"Chao-ming Li","doi":"10.22323/1.444.0561","DOIUrl":"https://doi.org/10.22323/1.444.0561","url":null,"abstract":"HESS J1809-193 is an extended TeV -ray source, but the exact origin of its -ray emission is still uncertain. One possible candidate for its emission source is the pulsar wind nebula (PWN) of PSR J1809-1917, located within the extended -ray emission region. Driven by the central pulsar, ultrarelativistic electrons within the PWN can give rise to emissions ranging from radio to X-ray through synchrotron processes, and -ray emissions through inverse Compton (IC) scattering.To determine if this PWN might be the counterpart of HESS J1809-193, we examined the Chandra X-ray radial intensity proﬁle and the spectral index proﬁle of this PWN. We also employed a one-zone isotropic diﬀusion model to ﬁt the keV and the TeV data. Our analysis reveals a diﬀuse nonthermal X-ray emission that extends beyond the PWN. This is likely an X-ray halo generated by electron/positron pairs escaping from the PWN. Interestingly, a substantial magnetic ﬁeld of 20 G is needed to account for the spatial evolution of the X-ray spectrum, notably the marked softening of the spectrum as we move further from the pulsar. However, such a strong magnetic ﬁeld would likely dampen the IC radiation of the pairs. This suggests that a hadronic component might be necessary to fully explain the nature of HESS J1809-193..","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128833909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive study of solar energetic particle propagation during the first ground-level enhancement of the solar cycle 24 太阳活动周期第一次地面增强期间太阳高能粒子传播的综合研究24

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-15 DOI: 10.22323/1.444.1350

S. Benella, M. Laurenza, C. Plainaki, M. Martucci, R. Sparvoli

{"title":"A comprehensive study of solar energetic particle propagation during the first ground-level enhancement of the solar cycle 24","authors":"S. Benella, M. Laurenza, C. Plainaki, M. Martucci, R. Sparvoli","doi":"10.22323/1.444.1350","DOIUrl":"https://doi.org/10.22323/1.444.1350","url":null,"abstract":"The first ground-level enhancement (GLE) of the 24 th solar cycle was observed on 2012 May 17 by the ground-based neutron monitor network. Correspondingly, space-based high-energy particle detectors at the Earth orbit observed the typical signatures of a solar energetic particle (SEP) event. The SEP/GLE event occurred during the transit of a large-scale magnetic cloud. A comprehensive study of the event is presented here by analyzing both space-and ground-based high-energy particle measurements as well as by estimating the magnetic cloud configuration through the Grad-Shafranov reconstruction. In order to give an estimate of the GLE primary energy spectrum we use the neutron monitor based anisotropic GLE pure power law (NMBANGLE PPOLA) model and we compare results with spacecraft observations by using data gathered by the PAMELA experiment, which was in a favorable position with respect to the arrival directions of primary protons during the event main phase. The anisotropy of the particle flux during the SEP/GLE event is also investigated through the NMBANGLE PPOLA. Our results suggest that the large-scale magnetic cloud configuration played an important role in leading the high-energy particle propagation.","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127178448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Detection of Diffuse γ-Ray Emission toward a Massive Star-forming Region Hosting Wolf-Rayet Stars 探测含有沃尔夫-拉叶星的大质量恒星形成区漫射γ射线

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.0835

Kai Wang

引用次数: 0

The First LHAASO Catalog of Gamma-ray Sources below 25TeV 第一个低于25TeV的伽玛射线源LHAASO目录

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.0655

Shicong Hu, G. Xiang, M. Zha, Z. Yao

引用次数: 0

Coating thermal noise investigation for KAGRA KAGRA涂层热噪声研究

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.1577

Kazuhiro Yamamoto, Yukino Mori, Yota Nakayama, T. Ushiba

{"title":"Coating thermal noise investigation for KAGRA","authors":"Kazuhiro Yamamoto, Yukino Mori, Yota Nakayama, T. Ushiba","doi":"10.22323/1.444.1577","DOIUrl":"https://doi.org/10.22323/1.444.1577","url":null,"abstract":"Gravitational wave astronomy is an emerging field in astronomy and astrophysics. For proper investigation and research in this field, the noise in the interferometers used as gravitational wave detectors must be reduced. Thermal noise caused by mechanical loss in the reflective coating on the mirrors is a fundamental source of noise. The cryogenic technique is a noise reduction method adopted by KAGRA (Kamioka, Japan) and the Einstein Telescope (to be constructed in Europe). However, further thermal noise reduction is required. For this purpose, an apparatus for measuring the mechanical loss of the coating at cryogenic temperatures must be developed. Such an apparatus was prepared at University of Toyama, Japan. The apparatus was cooled using liquid nitrogen and helium. The losses of the sample disks with and without the coating were measured. The mechanical loss in the coating and the thermal noise were derived from the difference between the losses of the sample disks with and without the coating. This apparatus was then used to investigate conventional coatings; and this apparatus is expected to be used in coatings in the future. The outline and important details of the apparatus are provided in this article.","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"33 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123610120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Flat Proton Spectra at Interplanetary Shocks 关于行星际激波中的平坦质子谱

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.1337

M. Malkov

{"title":"On the Flat Proton Spectra at Interplanetary Shocks","authors":"M. Malkov","doi":"10.22323/1.444.1337","DOIUrl":"https://doi.org/10.22323/1.444.1337","url":null,"abstract":"Spacecraft observations of interplanetary shocks have revealed signi(cid:28)cant deviations in energetic particle spectra from the di(cid:27)usive shock acceleration (DSA) theory predictions. Within almost two decades of particle energy, spanning about seven e-folds upstream, the particle (cid:29)ux is almost energy independent. Although at and behind the shock, it falls o(cid:27) as ϵ − 1 (as predicted by DSA for reasonably strong shocks), the (cid:29)ux decreases with the coordinate close to the shock upstream progressively steeper at lower energies, which leads to a (cid:29)at energy distribution. Within a standard DSA solution under a (cid:28)xed turbulence spectrum, pre-existing or self-excited by accelerated particles, a (cid:29)at particle spectrum over an extended upstream area means that the particle di(cid:27)usivity must be energy-independent, contrary to most transport models. We propose a resolution of this paradox by invoking a strongly nonlinear solution upstream under a self-driven but short-scale turbulence, in which the particle di(cid:27)usivity increases with energy as ∝ ϵ 3 / 2 , but also decays with the wave energy as 1 /E w , which compensate for the ϵ 3 / 2 rise. The main di(cid:27)erence with the traditional DSA is that the wave-particle interaction is nonresonant, and the turbulence is not saturated at the Bohm level (that would require δB ∼ B 0 turbulence saturation amplitude). A steep, energy-dependent (cid:28)nal drop in the particle (cid:29)ux far ahead of the shock to its background level in the solar wind is likely due to a quick particle escape upstream","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122132470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Campus Cosmic-ray Observation Collaboration and Its Activities 校园宇宙射线观测合作及其活动

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.1631

Wenli Zheng

{"title":"Campus Cosmic-ray Observation Collaboration and Its Activities","authors":"Wenli Zheng","doi":"10.22323/1.444.1631","DOIUrl":"https://doi.org/10.22323/1.444.1631","url":null,"abstract":"Cosmic rays are natural and readily available. Observation of cosmic rays in middle schools can stimulate students’ curiosity and interest in nature. Through the construction of the campus cosmic-ray observation network, the cosmic-ray observation is brought into schools, so that students have the opportunity to get a glimpse of the frontier research, receive the real training of modern scientific research, comprehensively improve the scientific and technological quality of teachers and students, and stimulate students’ interest in learning physics. Campus Cosmic-ray Observation Collaboration (CCOC) is a non-profit collaboration unit composed of members voluntarily, supported by the Institute of High Energy Physics, Chinese Academy of Sciences. Its activities are mainly based on the large scientific infrastructure ‘Large High Altitude Air Shower Observatory’ (LHAASO) and the popular science magazine ' Modern Physics' (MP). This report will give a brief description on CCOC and the activities carried out since it was established on September 28, 2020, including setting up campus observation stations and network, popularizing cosmic-ray knowledge, encouraging cosmic-ray study, strengthening collaboration on cosmic-ray observation, facilitating student and teacher training and strengthening relevant international exchanges. CCOC hopes to learn from and communicate with international colleagues on how to carry out outreach and education experience in cosmic-ray based on large scientific devices.","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134228854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tapping Jet Energy for Cosmic Ray Acceleration 利用喷射能量加速宇宙射线

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.1556

M. Malkov

{"title":"Tapping Jet Energy for Cosmic Ray Acceleration","authors":"M. Malkov","doi":"10.22323/1.444.1556","DOIUrl":"https://doi.org/10.22323/1.444.1556","url":null,"abstract":"This study examines the conditions governing the acceleration and reacceleration of cosmic rays (CRs) by ultra-relativistic jets. We demonstrate that cylindrically symmetric jets cannot reaccelerate external CRs. Without symmetry breaking, e.g., signi(cid:28)cant CR scattering, the jet-boosted magnetic and motional electric (cid:28)elds lead to specular re(cid:29)ection of incoming CRs. The one-dimensional particle dynamics, resulting from jet symmetry, categorizes CRs into passing particles and those bound by the jet’s magnetic and motional electric (cid:28)elds. Passing particles exhibit energy consistency, originating and returning to the jet exterior with the same energy, necessitating trapping through scattering or other orbit distortions to access the jet’s energy reservoir. These (cid:28)ndings challenge some claims in the literature suggesting that outer CRs can achieve up to 2Γ 2 energy gain in a \"one-shot\" scenario, brie(cid:29)y encountering a jet with a bulk Lorentz factor Γ and experiencing no signi(cid:28)cant scattering within it. We establish that scattering within the jet facilitates CRs to traverse the separatrix between passing and trapped particles, thus potentially unlocking the jet energy for CRs. Additionally, we investigate the magnetic pumping acceleration mechanism, which requires CR trapping unless they are initially seeded within the jet. We illustrate how CR acceleration via magnetic pumping is contingent upon CR scattering. Consequently, our results underscore the critical role of particle scattering and symmetry-breaking mechanisms in e(cid:30)ciently accelerating particles through conducting (cid:29)uid motions.","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"1987 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125478553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Emission from the jets of Low-luminosity Active Galactic Nuclei 低光度活动星系核的喷流辐射

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023) Pub Date : 2023-08-14 DOI: 10.22323/1.444.0947

Gunjan Tomar, N. Gupta, R. Prince

{"title":"Emission from the jets of Low-luminosity Active Galactic Nuclei","authors":"Gunjan Tomar, N. Gupta, R. Prince","doi":"10.22323/1.444.0947","DOIUrl":"https://doi.org/10.22323/1.444.0947","url":null,"abstract":"Low-Luminosity Active Galactic Nuclei (LLAGNs) are challenging to study due to their faintness despite occupying 40% of the local Universe. The radiatively inefficient accretion flows that power these LLAGNs are known to be efficient at producing bipolar jets. Multi-wavelength observations of the jets act as a crucial probe of the physical mechanism in these extreme environments. The recent detection of LLAGNs NGC 315 and NGC 4261 in gamma rays by Fermi-LAT allows us to model their multi-wavelength spectral energy distribution (SED) from radio to gamma rays. We find that the synchrotron and synchrotron self-Compton emission from an emission region at sub-parsec scale jet can explain the SEDs up to a few GeV, leaving an excess beyond that. The gamma rays produced by the upscattering of the starlight photons from the host galaxy by the ultra-relativistic electrons at the kilo-parsec scale successfully explain this excess. Thus, similar to luminous AGNs, the electrons in the kilo-parsec jets of LLAGNs are also accelerated to ultra-relativistic energies. The ejection of a discrete knot from another LLAGN, M81*, again suggests similarities in the jet production mechanism for luminous AGNs and LLAGNs. Due to non-detection in gamma rays, we model its multi-wavelength SEDs from radio to X-rays at different epochs during the knot ejection to infer the properties of the jet. We also model the SEDs during other X-ray flaring periods identified from the long-term Swift light curve. As seen in the high-synchrotron-peaked blazars (a sub-class of luminous AGNs), the synchrotron emission from relativistic electrons from a single zone explains the SEDs from radio to X-ray during all states. We present these results and compare the similarities of these jets in LLAGNs with those produced in luminous AGNs","PeriodicalId":448458,"journal":{"name":"Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116508777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0