Communications of the Byurakan Astrophysical Observatory最新文献

Mid-infrared detectors for space electronics based on InAs-core/InP-shell nanowires 基于 InAs 核/InP 壳纳米线的空间电子中红外探测器

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-344

M.Ya, ∗. Vinnichenko, †. R.V.Ustimenko, D. A. Karaulov, D. A. Firsov, V. V. Fedorov, A. Mozharov, D. A. Kirilenko, I. S. Mukhin, H. Sarkisyan, D. Hayrapetyan, É. Kazaryan

{"title":"Mid-infrared detectors for space electronics based on InAs-core/InP-shell nanowires","authors":"M.Ya, ∗. Vinnichenko, †. R.V.Ustimenko, D. A. Karaulov, D. A. Firsov, V. V. Fedorov, A. Mozharov, D. A. Kirilenko, I. S. Mukhin, H. Sarkisyan, D. Hayrapetyan, É. Kazaryan","doi":"10.52526/25792776-23.70.2-344","DOIUrl":"https://doi.org/10.52526/25792776-23.70.2-344","url":null,"abstract":"The Mid-Infrared (MIR) spectral range is most important for free-space communications and astronomy. It contains radiation emitted by astrophysical objects during evolution of the planets, stars, galaxies and in particular by prebiosignature molecules on exoplanets. Nanowires (NWs) are expected to improve various optoelectronic devices, including IR photodetector technology. The bandgap of the catalystless InAs NWs can be tuned by introducing mechanical strain due to lattice mismatches in the core/shell NWs structures. Passivation with wider bandgap InP shell provide highly tunable functionality for future electronic devices. Temperature dependence of photoluminescence (PL) spectra of NWs InAs and InAs-core/InP-shell was acquired using Fourier-spectrometer. The position of the high-energy PL peak between calculated values of Eg for wurtzite and sphalerite structures confirms the formation of NWs into a combined polytype. Low energy PL peak is connected with parasitic bulk islands. Surface passivation successfully eliminates surface states and provides nontrivial temperature dependence of high-energy PL peak due to tensile and compressive strain in InAs core. Thus, detectors based on NWs InAs and InAs-core/InP-shell structures can operate in the MIR range of the spectrum with a wavelength from 2 to 5 μm.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"43 38","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139442547","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

Application of small spacecraft for automatic identification of vessels 应用小型航天器自动识别船只

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-335

S. B. Makarov, S. Zavjalov, S. V. Volvenko, I. Lavrenyuk, I. N. Gorbunov, M. Y. Vinnichenko, A. Aharonyan, V. Avetisyan

引用次数: 0

Deformation of Special Relativity in ultra-highenergy astrophysics 超高能天体物理学中狭义相对论的变形

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-188

G. Ter-Kazarian

{"title":"Deformation of Special Relativity in ultra-highenergy astrophysics","authors":"G. Ter-Kazarian","doi":"10.52526/25792776-23.70.2-188","DOIUrl":"https://doi.org/10.52526/25792776-23.70.2-188","url":null,"abstract":"We reviewdeformationofbothpostulatesofSpecialRelativity(SR) theory, tested inexperiments forultra-highenergycosmicray(UHECRs)andTeV-γphotonsobserved. Tothisaim,weutilize the theoryof,so-called,masterspace(MSp)inducedsupersymmetry(Ter-Kazarian,2023,2024),whereinthe standardLorentzcode(SLC)isderivedinanewperspectiveofdoubleglobalMSp-SUSYtransformations intermsofLorentzspinors (θ,¯ θ) referredtoMSp. Thisallows to introducethephysicalfiniterelative timeintervalbetweentwoeventsasintegernumberoftheownatomicdurationtimeofdoubletransition ofaparticlefromM4toMSpandback.WhilealltheparticlesarelivingonM4,theirsuperpartnerscan beviewedaslivingonMSp.ThisisamaingroundforintroducingMSp,whichisunmanifestedindividual companiontotheparticleof interest. Continuingalongthis line, inpresentcommunicationweaddress thedeformationofthesespinors: θ→˜ θ=λ1/2θ,etc.,whereλappearsasascalardeformationfunctionof theLorentzinvariance(LIDF).ThisyieldsboththeDLEandDMAV,respectively, intheform˜ ds=λds and˜ c=λc, provided, the invarianceofDLE, andthesamevalueofDMAVinfree spaceholdforall inertial systems. Thus, theLID-generalizationof globalMSp-SUSYtheory formulates thegeneralized relativitypostulatesinawaythatpreservetherelativityof inertial frames, inspiteoftheappearanceof modifiedtermsintheLIDdispersionrelations.Wecomplementthisconceptual investigationwithtesting ofvariousLIDFs intheUHECR-andTeV-γthresholdanomaliesbyimplications forseveral scenarios: theColemanandGlashow-typeperturbativeextensionofSLC,theLIDextensionofstandardmodel,the LIDinquantumgravitymotivatedspace-timemodels,theLIDinloopquantumgravitymodels,andthe LIDFforthemodelspreservingtherelativityof inertial frames.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"29 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444054","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

Observational evidence of instability phenomena related to open star clusters based on Gaia data 基于盖亚数据的开放星团不稳定现象观测证据

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-277

D. A. Kovaleva

引用次数: 0

Kinematic structure of the stellar population of the solar neighborhood by Gaia DR3 盖亚 DR3 发现的太阳邻近地区恒星群的运动结构

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-338

E. Postnikova, S. Vereshchagin, N. Chupina, D. A. Mosunova

引用次数: 0

Separation of Frequency Variables in the Problem of Diffuse Reflection from a Semi-Infinite Medium under Isotropic Scattering with a General Law of Radiation Redistribution by Frequencies 各向同性散射条件下半无限介质漫反射问题中的频率变量分离与频率辐射再分布的一般规律

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-204

H. V. Pikichyan

{"title":"Separation of Frequency Variables in the Problem of Diffuse Reflection from a Semi-Infinite Medium under Isotropic Scattering with a General Law of Radiation Redistribution by Frequencies","authors":"H. V. Pikichyan","doi":"10.52526/25792776-23.70.2-204","DOIUrl":"https://doi.org/10.52526/25792776-23.70.2-204","url":null,"abstract":"Inthepresentedwork,withthehelpofanewapproachpreviouslyproposedbytheauthor,theproblem ofdiffusereflectionofradiationfromaplane-parallelsemi-infinitemediumunderisotropicscatteringinthe caseofthegeneral lawofradiationredistributionbyfrequenciesissolved.Resultingsolutionimplements thepossibilityof separatingapair of independent variables (namely, the frequencyanddirectionof thequantum)of enteringthemediumquantafromthesamepairof exitingquanta. Theadvantageof thisapproach inrelationtotheknownmethods is that the separationof theexplanatoryvariables is achievedwithouttheneedtosolvetheadditionalproblemofseparationoranyspecial representationof thecharacteristicsofasingleactofscattering.Here, inanexpandedformissoughtnamelythesolutionof themodifiedinitialproblem, insteadofapreliminarydecompositionofthecharacteristicsofasingleact ofscattering.Asaresult, theunknownfunctionofthefourexplanatoryvariables isexpressedexplicitly throughasystemofauxiliaryfunctionsthatdependononlytwovariables. Forthispurpose,aproblem foreigenvaluesandeigenfunctions is formulatedforaspeciallyselectedandpreviouslyunknownkernel. Bilateral relationshipsbetweenthe solutionsof thenewandtraditionallyusedmethodsareobtained, whichmakes itpossible todirectlycompare theiraccuracyandefficiency. Thegeneral schemeof the organizationofcalculationsisalsodiscussed.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"31 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443519","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

BL Lacertae: Recovering intrinsic trajectory of a quasi-stationary jet feature on subparsec-scales BL Lacertae：在亚秒尺度上恢复准稳态喷流特征的固有轨迹

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-328

L. Hambardzumyan, T. Arshakian, A. Pushkarev

{"title":"BL Lacertae: Recovering intrinsic trajectory of a quasi-stationary jet feature on subparsec-scales","authors":"L. Hambardzumyan, T. Arshakian, A. Pushkarev","doi":"10.52526/25792776-23.70.2-328","DOIUrl":"https://doi.org/10.52526/25792776-23.70.2-328","url":null,"abstract":"Very Long Baseline Array (VLBA) observations allow us to investigate the fine structure and dynamics of the inner part of the BL Lacertae jet. Long-term VLBA monitoring at 15 GHz has revealed the existence of a quasi-stationary component (QSC) in the jet interior, located about 0.26 mas from the radio core, followed by superluminal moving radio components. The study of the QSC motion is important in order to shed light on the dynamics of the inner part of the relativistic jet on spatial scales of milliparsecs. The latter is problematic due to measurement errors on such scales. In addition, the apparent QSC motion is a combination of the intrinsic motion of the QSC and the radio core, which predominantly occurs in the direction of the jet axis. Careful error analyses and apparent trajectory smoothing techniques are important to reveal the QSC intrinsic motion. We use 164 epochs of VLBA monitoring of the jet in BL Lacertae, available as part of the MOJAVE program, to study the QSC motion. We apply a moving average method to filter out the core contribution, which allows the detection of QSC intrinsic motion and develop an algorithm to clean up the smoothed trajectory using QSC positioning errors. We find that the QSC intrinsic trajectory is a combination of irregular reversals occurring on scales from about 0.15 yr to 0.5 yr. An analysis of the estimates of the reversal characteristics is presented for smoothed and cleaned trajectories.","PeriodicalId":412578,"journal":{"name":"Communications of the Byurakan Astrophysical Observatory","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444826","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 Astronomical Context of Fish-shaped Vishap Stone Stelae 论鱼形维沙普石碑的天文背景

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-249

H. A. Malkhasyan

引用次数: 0

The role of environment on the formation of different FR type extragalactic radio sources 环境对不同 FR 型河外射电源形成的作用

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-292

R. Andreasyan, G. Paronyan, A. G. Sukiasyan

引用次数: 0

Is the Andromeda galaxy approaching our galaxy Milky Way? 仙女座星系正在接近我们的银河系吗？

Communications of the Byurakan Astrophysical Observatory Pub Date : 2024-01-09 DOI: 10.52526/25792776-23.70.2-165

H. Harutyunian, A.M. Grigoryan, A. Khasawneh, A. A. Torosyan

引用次数: 0