Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)最新文献

{"title":"Statistical physical parameter properties of Ap/Bp-stars in the Orion OB1 Association","authors":"A. V. Moiseeva, I. Romanyuk, V. Aitov","doi":"10.22323/1.425.0045","DOIUrl":"https://doi.org/10.22323/1.425.0045","url":null,"abstract":"The article presents the results of physical parameters ( 𝑇 eff , log 𝑔 , 𝐿 , 𝑀 , 𝑅 , 𝑣 𝑒 sin 𝑖 , 𝑣 𝑒 ) study for chemically peculiar stars in the Orion OB1 association. Spectral material of circularly polarized radiation for all CP stars was obtained at the 6-m BTA telescope in the SAO RAS. As a result, no statistical differences were found between magnetic and non-magnetic CP stars of the association. The difference was found for the projection of rotation velocity parameter 𝑣 𝑒 sin 𝑖 . However, a detailed study of the equatorial velocity 𝑣 𝑒 showed that the average value for magnetic does not differ from non-magnetic Ap/Bp stars.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129779654","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}

{"title":"The influence of host galaxy morphology on Type Ia Supernovae standardization and cosmological analysis","authors":"Anastasia Yurevna Baluta, M. Pruzhinskaya, P. Rosnet, N. Pauna","doi":"10.22323/1.425.0037","DOIUrl":"https://doi.org/10.22323/1.425.0037","url":null,"abstract":"Type Ia Supernovae (SNe Ia) are known to be good distance indicators in the Universe. It becomes possible thanks to the empirical relation between SN light curve parameters and luminosity. However, the Hubble diagram still shows some remaining intrinsic dispersion, which can be related to the effect of supernova environment. In this work we study how the host galaxy morphology affects SN Ia standardization and cosmological analysis using 330 supernovae from the Pantheon cosmological sample. We reproduce the Pantheon Hubble diagram fit and perform the fit separately for two SN groups according to the morphological type of their host galaxies: early-type and late-type. We found that in passive stellar environment SNe Ia have higher 𝛼 and smaller 𝛽 standardization parameters than supernovae hosted by late-type galaxies. The early-type galaxies contain brighter supernovae after stretch and colour corrections. Thus, the host morphology correction do affect the Hubble diagram fit. We also notice that the host mass correction alone is not enough to take the influence of the environment into account. The observed intrinsic scatter in SNe Ia luminosity can still be partially compensated by a more correct consideration of the environmental correction. The Multifaceted Universe: Theory and Observations","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130890775","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}

{"title":"The Shape of Sunspots in Cycle 24","authors":"A. Tlatov","doi":"10.22323/1.425.0064","DOIUrl":"https://doi.org/10.22323/1.425.0064","url":null,"abstract":"","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126534555","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}

{"title":"Detection of absorption in the decimeter radio emission of solar corona","authors":"V. Bogod, M. Lebedev, N. Ovchinnikova, A. Ripak, E. A. Kurochkin","doi":"10.22323/1.425.0005","DOIUrl":"https://doi.org/10.22323/1.425.0005","url":null,"abstract":"The results of new observations of the radio emission of the solar corona in the range of 1– 3 GHz with the RATAN-600 are presented. Observations in this range are characterized by a presence of strong industrial interference from mobile communications, GPS, microwave ovens, aircraft radars, etc. At the same time, problems related to the conversion of magnetic energy into flare energy, coronal heating, the role of narrow-band phenomena, and quasi-periodic pulsations in the solar corona remain topical. Change in the concept of receiving spectral equipment for the RATAN-600 radio telescope has become an urgency. Thus, work is now underway on the creation of a series of new generation spectral complexes covering the entire operating range of RATAN-600 from 1 GHz to 40 GHz. In this article, we present the results of the first series of observations with the Panoramic Analyzer of Spectrum in the range of 1–3 GHz (PAS 1–3 GHz) for studies of low-contrast coronal structures. This equipment has fine spectral resolution (more than 8000 channels/GHz), a wide frequency range (more than an octave), high time resolution (up to 8 ms/spectrum), and a wide dynamic range (about 90 dB). A multi-object observation mode becomes available for various objects, from powerful flare phenomena to faint structures down to the radio granulation level. A high-speed pipeline for receiving, digitizing, and processing information has been developed and implemented in order to separate useful signals and interference in real time. These features, together with the capabilities of the RATAN-600 in terms of effective area and wide frequency coverage, made it possible to observe weak coronal structures in the 1–3 GHz range. As a result, new properties of the coronal plasma were discovered. One of the first results of these observations was the registration of narrow-band absorption in the frequency band 1520–1630 MHz, near the OH absorption line (1612–1720 MHz). Possible ways of explaining the nature of such absorption in the solar corona are discussed.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132441771","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}

{"title":"A new Method for Verification of Astronomical Spectral Flux Density Calibrators based on SRT Data","authors":"A. N. Ermakov, Y. Kovalev, V. Vasilkov, V. Soglasnov, M. Lisakov, Y. Kovalev","doi":"10.22323/1.425.0001","DOIUrl":"https://doi.org/10.22323/1.425.0001","url":null,"abstract":"The RadioAstron is an international project of a ground-space VLBI at the wavelengths 92, 18, 6.2 and 1.35 cm. The SRT has a paraboloid antenna with a 10 m diameter. It had been launched on July 18, 2011 and worked in flight up to January 10, 2019 together with many ground-based radio telescopes. The base of the VLBI reached 250 000 km. The results of mass processing of radiometric observations obtained with the RadioAstron Space Radio Telescope (SRT) are presented. A new complex for automated processing of SRT calibration sessions in the single telescope mode has been designed. The main and backup noise signal generators as secondary calibration standards in the wavelength ranges of 6.2, 18 and 92 cm in the calibration sessions for the 4 years of SRT flight in 2015–2019 are calibrated relative to the known primary flux density standard sources - Cassiopeia-A (Cas A) and the Crab Nebula (Crab). Calibration was carried out using the 1977 generally accepted spectral flux density scale. One of the most important and unexpected results of processing is the detection of a 25–35% discrepancy between the noise generator calibrations relative to Crab and Cas A. The analysis showed that the reason for this discrepancy is a real long-term variability of Cas A and Crab, which does not correspond to the known extrapolated flux densities in the standard scale of 1977. The transition from the generally accepted flux density scale of 1977 to the new corrected scales of 2017 and 2014 eliminates the discrepancy found. Based on the analysis above the report proposes a new method for verifying astronomical spectral flux density calibrators. A noise generator of a telescope is used as an indicator. The SRT calibration example is extended to most ground-based radio telescopes, also possibly including the RATAN-600.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116428266","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}

{"title":"The Search for Neutrino Events from the Blazar PKS 0735+17 at the Baksan Underground Scintillation Telescope","authors":"V. Petkov, E. Gorbacheva, R. Guliev, I. Dzaparova, M. Kochkarov, M. Kostyuk, A. Kurenya, E. Martakov, Yu. F. Novoseltsev, R. Novoseltseva, P. Striganov, I. Unatlokov, A. Yanin","doi":"10.22323/1.425.0033","DOIUrl":"https://doi.org/10.22323/1.425.0033","url":null,"abstract":"The results of searching for neutrino events from the blazar PKS 0735+17 at the Baksan Underground Scintillation Telescope (BUST) are presented. A neutrino from the PKS 0735+17 region was detected at BUST on December 4, 2021, during a strong outburst of this object, coinciding with an observed Fermi LAT gamma-ray outburst. The BUST neutrino event preceded the detections of high-energy neutrino events from the PKS 0735+17 region by IceCube, Baikal-GVD, and KM3NeT. The Multifaceted Universe: Theory and Observations - 2022","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127294117","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}

{"title":"Computer simulation of a new deployment system for precise solid space reflector","authors":"M. Glotov, V. Bujakas","doi":"10.22323/1.425.0008","DOIUrl":"https://doi.org/10.22323/1.425.0008","url":null,"abstract":"","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128434551","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}

{"title":"Microwave imaging spectroscopy of the solar corona","authors":"S. Lesovoi, M. Globa, A. Gubin, A. Altyntsev","doi":"10.22323/1.425.0014","DOIUrl":"https://doi.org/10.22323/1.425.0014","url":null,"abstract":"The study of the solar corona plays a key role in understanding solar activity. Microwave imaging spectroscopy - measuring microwave spectra at every point on the solar disk (or image) - is the most promising method for studying the lower corona and the chromosphere-corona transition region. Solar microwave emission originates in the low corona and in the upper chromosphere and is produced both by thermal and non-thermal electrons. The main types of emission are bremsstrahlung, gyroresonance and gyrosynchrotron emission. The quiet Sun emission is dominated by the bremsstrahlung while the active region emission is due to the gyroresonance mechanism. The gyrosynchrotron emission is generated by non-thermal electrons during solar flares. Microwave emission spectra allow us to estimate the temperature and density of the plasma in active regions. Microwave spectroscopy of the solar corona is perhaps the only method for measuring the coronal magnetic field both for the quiet Sun and for transient events. The Siberian Radioheliograph (SRH), a new generation solar radio telescope, is described, and the first observations of solar activity in the broadband frequency range 3-24 GHz are presented. The estimation of the magnetic field scale length is presented. The scale length was estimated by using the SRH data – spectra of an active region emission in the frequency range 3–12 GHz. The Multifaceted Universe: Theory Observations","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"427 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131757504","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}

{"title":"Cowling resistivity and Joule dissipation in solar atmosphere","authors":"A. Stepanov, V. Zaitsev, E. Kupriyanova","doi":"10.22323/1.425.0052","DOIUrl":"https://doi.org/10.22323/1.425.0052","url":null,"abstract":"Joule dissipation rates in the magnetic flux tubes at di ff erent heights of the solar atmosphere, from the photosphere to the corona, are studied. It is assumed that the generation of electric currents is caused by convective motions at the photospheric foot-points of the flux tubes. It is shown that the role of ion–atom collisions in the Joule dissipation and solar plasma heating is decisive. The Cowling resistivity exceeds the classical (Spitzer) resistivity not only in the weakly ionized layers of the atmosphere but also in the corona with the relative density of the neutral atoms of about 10 − 7 cm − 3 if the electric currents are I ≥ 2 × 10 8 A. As an illustration of the altitude dependence of the Cowling resistivity for di ff erent magnitudes of the electric current, we applied the atmospheric model developed by Avrett and Loeser [1]. We have shown that the maximal dissipation occurs in the transition region. The role of Cowling resistivity in Joule dissipation increases with the filamentation of magnetic flux tubes. The Multifaceted Universe: Theory","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130772875","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}

{"title":"The Methods and a Hardware-Software Complex for Measuring the Stability of Radio Telescope Receiving Systems","authors":"Yuriy V. Vekshin","doi":"10.22323/1.425.0003","DOIUrl":"https://doi.org/10.22323/1.425.0003","url":null,"abstract":"Radio telescope sensitivity in radiometric observations and the accuracy of signal delay measurements in radio interferometric observations are largely determined by the amplitude and phase instability of the receiving equipment. To identify the sources of this instability, an urgent task is to create methods and equipment to measure the instability of the receiving system as a whole and its individual stages in particular. The paper presents a developed hardware-software complex, methods, and investigation of the amplitude and phase stability of the \"Quasar\" VLBI Network radio telescope receiving systems. The main sources of instability of the receiving systems and ways to improve their stability are determined. The measured RT-13 radio telescope characteristics obtained by the created hardware-software complex are presented. A method to determine the optimal signal averaging time of a radio interferometer has been developed, which reduces the error in determining the UT1 − UTC corrections. Multifaceted","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122673729","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}