J. Shamsutdinova, Jinge Zhang, D. Zhdanov, L. Kashapova, H. Reid
We present a preliminary analysis of a flare event that took place on 3 June 2021 at 01:36 UT. It was observed in microwaves by the Siberian Radioheliograph (SRH) within 3–6 GHz and by the Broadband Microwave Spectropolarimeter (BBMS), and in the meter-wavelength range by the e-Callisto spectrometer network. We found several type III bursts and a type-J burst in the meter-wavelength range. At the same time, only one burst was detected in the averaged time profiles of microwave emission. This one corresponds to the strongest type III radio burst. Using images from the SRH, we defined two sources and separately analysed their time profiles. This approach allowed us to find microwave bursts associated with radio bursts, which were indistinguishable in the averaged time profiles. The observed delays between the microwave and meter-wavelength emissions were compared with the results of a preliminary analysis of dynamic spectra in the meter-wavelength range.
{"title":"A study of the Relationship Between the Microwave and Meter-Wavelength Emissions from the Solar Flare on June 3, 2021","authors":"J. Shamsutdinova, Jinge Zhang, D. Zhdanov, L. Kashapova, H. Reid","doi":"10.22323/1.425.0065","DOIUrl":"https://doi.org/10.22323/1.425.0065","url":null,"abstract":"We present a preliminary analysis of a flare event that took place on 3 June 2021 at 01:36 UT. It was observed in microwaves by the Siberian Radioheliograph (SRH) within 3–6 GHz and by the Broadband Microwave Spectropolarimeter (BBMS), and in the meter-wavelength range by the e-Callisto spectrometer network. We found several type III bursts and a type-J burst in the meter-wavelength range. At the same time, only one burst was detected in the averaged time profiles of microwave emission. This one corresponds to the strongest type III radio burst. Using images from the SRH, we defined two sources and separately analysed their time profiles. This approach allowed us to find microwave bursts associated with radio bursts, which were indistinguishable in the averaged time profiles. The observed delays between the microwave and meter-wavelength emissions were compared with the results of a preliminary analysis of dynamic spectra in the meter-wavelength range.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"31 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":"117265798","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}
We report our first results of the spectroscopy of the supergiants HD 223960 (A0.1 Ia) and HD 225094 (B2.9 Iab), which are members of the Cas OB5 association. Our study is based on the long-term spectroscopy of BA-type supergiants. The high-resolution echelle spectra were obtained in 2017 — 2021 with the 6 meter telescope of the Special Astrophysical Observatory using echelle spectrograph NES. We provided an analysis of the velocity field in the stellar atmospheres and in the circumstellar medium, and found the profile variability of the HI and HeI lines and multicomponent structure of interstellar NaI and KI lines. The Multifaceted Universe:
{"title":"Long-term spectral monitoring of the high-luminosity stars in the Cas OB5 association","authors":"E. Islentieva, V. Klochkova","doi":"10.22323/1.425.0041","DOIUrl":"https://doi.org/10.22323/1.425.0041","url":null,"abstract":"We report our first results of the spectroscopy of the supergiants HD 223960 (A0.1 Ia) and HD 225094 (B2.9 Iab), which are members of the Cas OB5 association. Our study is based on the long-term spectroscopy of BA-type supergiants. The high-resolution echelle spectra were obtained in 2017 — 2021 with the 6 meter telescope of the Special Astrophysical Observatory using echelle spectrograph NES. We provided an analysis of the velocity field in the stellar atmospheres and in the circumstellar medium, and found the profile variability of the HI and HeI lines and multicomponent structure of interstellar NaI and KI lines. The Multifaceted Universe:","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"126 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":"133134955","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}
We analyze the X-ray spectra and light curves of five unknown X-ray sources found in the observations obtained by the XMM-Newton satellite. For two objects we have found X-ray flares. Three other objects have X-ray spectra similar to those of enigmatic 𝛾 Cas analogs and may be new candidates for such stars. All the considered sources are faintly visible in the DSS optical images. We suggest that all the studied objects can be either very distant stars or transient sources. Multifaceted
{"title":"A study of unknown X-ray sources","authors":"E. Ryspaeva, A. Kholtygin","doi":"10.22323/1.425.0040","DOIUrl":"https://doi.org/10.22323/1.425.0040","url":null,"abstract":"We analyze the X-ray spectra and light curves of five unknown X-ray sources found in the observations obtained by the XMM-Newton satellite. For two objects we have found X-ray flares. Three other objects have X-ray spectra similar to those of enigmatic 𝛾 Cas analogs and may be new candidates for such stars. All the considered sources are faintly visible in the DSS optical images. We suggest that all the studied objects can be either very distant stars or transient sources. Multifaceted","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129791241","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}
O. Sholukhova, A. Sarkisyan, Y. Solovyeva, A. Vinokurov
Two LBV candidates have been found in the galaxy IC342. Within the framework of the program of searching for LBV stars in galaxies outside the Local Group, spectral and photometric observations were carried out with the 6-m telescope of SAO RAS. These two objects revealed observed features characteristic of LBV stars. Their spectra show typical LBV emission lines: the broad and strong hydrogen lines and the HeI, FeII, and [FeII] emissions. We have obtained the estimates of the interstellar reddening and the photosphere temperatures. For one star, it was possible to build the spectral energy distribution (SED) and determine the temperature more accurately. We estimated the absolute magnitudes as 𝑀 𝑣 ≈ − 9 . 3 𝑚 and − 10 . 8 𝑚 , which allows us to classify the stars as LBV candidates.
{"title":"Two new LBV candidates in the galaxy IC342","authors":"O. Sholukhova, A. Sarkisyan, Y. Solovyeva, A. Vinokurov","doi":"10.22323/1.425.0053","DOIUrl":"https://doi.org/10.22323/1.425.0053","url":null,"abstract":"Two LBV candidates have been found in the galaxy IC342. Within the framework of the program of searching for LBV stars in galaxies outside the Local Group, spectral and photometric observations were carried out with the 6-m telescope of SAO RAS. These two objects revealed observed features characteristic of LBV stars. Their spectra show typical LBV emission lines: the broad and strong hydrogen lines and the HeI, FeII, and [FeII] emissions. We have obtained the estimates of the interstellar reddening and the photosphere temperatures. For one star, it was possible to build the spectral energy distribution (SED) and determine the temperature more accurately. We estimated the absolute magnitudes as 𝑀 𝑣 ≈ − 9 . 3 𝑚 and − 10 . 8 𝑚 , which allows us to classify the stars as LBV candidates.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"24 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":"117166022","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}
M. Lebedev, N. Ovchinnikova, V. Bogod, A. Ripak, A. A. Storozhenko
We describe a new spectropolarimetric receiving complex for solar observations with the RATAN-600 radio telescope in the decimeter wavelength range. The use of a high-speed ADC and FPGA-based design of the DSP section made possible the direct detectorless reception and processing of radio frequency signals. The complex makes use of a method of radio frequency interference (RFI) mitigation based on the statistical properties of the received noise signal. We provide a brief description of the method, as well as details of the receiving system design, and give an example of the handling of data obtained from solar observations.
{"title":"Digital methods of RFI mitigation in radio astronomy","authors":"M. Lebedev, N. Ovchinnikova, V. Bogod, A. Ripak, A. A. Storozhenko","doi":"10.22323/1.425.0006","DOIUrl":"https://doi.org/10.22323/1.425.0006","url":null,"abstract":"We describe a new spectropolarimetric receiving complex for solar observations with the RATAN-600 radio telescope in the decimeter wavelength range. The use of a high-speed ADC and FPGA-based design of the DSP section made possible the direct detectorless reception and processing of radio frequency signals. The complex makes use of a method of radio frequency interference (RFI) mitigation based on the statistical properties of the received noise signal. We provide a brief description of the method, as well as details of the receiving system design, and give an example of the handling of data obtained from solar observations.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"68 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":"128955004","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}
N. Ovchinnikova, M. Lebedev, V. Bogod, Anatoliy Mikhailovich Ripak, A. A. Storozhenko
Data from solar observations with the RATAN-600 radio telescope in the 1–3 GHz and 3–18 GHz ranges were processed using multivariate statistical methods. This kind of analysis allows us to differentiate the radio sources in the active regions (ARs) on the Sun by their individual flux spectra and trace their evolution during the entire time they have been in sight, as well as to reveal fast processes in a narrow spectral range or in certain areas. It was found that we can isolate twisted magnetic loops in flare-productive ARs in our data, and detect gyrosynchrotron radio emission caused by the non-thermal electrons inside them. Also, we detected an absorption line close to 1.6 GHz with a variable frequency shift in several AR. It may be attributed to the hydroxyl in cool coronal mass, such as solar prominences and coronal rain. The Universe:
{"title":"Results of a new approach to the analysis of multi-wavelength observations data obtained with RATAN-600","authors":"N. Ovchinnikova, M. Lebedev, V. Bogod, Anatoliy Mikhailovich Ripak, A. A. Storozhenko","doi":"10.22323/1.425.0007","DOIUrl":"https://doi.org/10.22323/1.425.0007","url":null,"abstract":"Data from solar observations with the RATAN-600 radio telescope in the 1–3 GHz and 3–18 GHz ranges were processed using multivariate statistical methods. This kind of analysis allows us to differentiate the radio sources in the active regions (ARs) on the Sun by their individual flux spectra and trace their evolution during the entire time they have been in sight, as well as to reveal fast processes in a narrow spectral range or in certain areas. It was found that we can isolate twisted magnetic loops in flare-productive ARs in our data, and detect gyrosynchrotron radio emission caused by the non-thermal electrons inside them. Also, we detected an absorption line close to 1.6 GHz with a variable frequency shift in several AR. It may be attributed to the hydroxyl in cool coronal mass, such as solar prominences and coronal rain. The Universe:","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"33 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":"125912111","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}
The Lidov-Kozai perturbation was investigated in the region of Jupiter Trojans. These asteroids move in the mean-motion commensurability 1:1 with Jupiter. The study was carried out by means of numerical integration of equations of motion of real asteroids. The simplest dynamical model was used with Jupiter as an only perturbing body moving in a fixed elliptical orbit. After eliminating classical secular perturbations from osculating elements, it becomes possible to determine the influence of the Lidov-Kozai mechanism on the orbital inclination and eccentricity. As a result, it was found that for L 4 -trojans the maximum eccentricity, and, accordingly, the minimum inclination is achieved with perihelion argument values ω = 30º and 210º. For L 5 -trojans the maximum eccentricity is located at the points ω = 150º, 330º.
{"title":"Lidov-Kozai perturbation in the motion of Jupiter Trojans","authors":"Tamara Alekseevna Vinogradova","doi":"10.22323/1.425.0069","DOIUrl":"https://doi.org/10.22323/1.425.0069","url":null,"abstract":"The Lidov-Kozai perturbation was investigated in the region of Jupiter Trojans. These asteroids move in the mean-motion commensurability 1:1 with Jupiter. The study was carried out by means of numerical integration of equations of motion of real asteroids. The simplest dynamical model was used with Jupiter as an only perturbing body moving in a fixed elliptical orbit. After eliminating classical secular perturbations from osculating elements, it becomes possible to determine the influence of the Lidov-Kozai mechanism on the orbital inclination and eccentricity. As a result, it was found that for L 4 -trojans the maximum eccentricity, and, accordingly, the minimum inclination is achieved with perihelion argument values ω = 30º and 210º. For L 5 -trojans the maximum eccentricity is located at the points ω = 150º, 330º.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132518108","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}
The process of galactic disc growing is still not fully understood. In the majority of disk galaxies the gas and stars are located in the same plane and rotate in the same direction. However, there are kinematically peculiar galaxies hosting two counter-rotating stellar discs. Their origin is believed to be the result of a past event of accretion of gas followed by star formation. By studying such galaxies we can learn how much material, when, and how, have fallen onto the progenitor galaxy. We identified a sample of 56 counter-rotating galaxies in the MaNGA IFU survey and initiated a follow-up observing campaign at the 6-m telescope (BTA) aiming to determine the stellar population properties of both stellar discs. Our preliminary results suggest the dichotomy of the sample of counter-rotating galaxies. We found that most massive galaxies have extended counter-rotating disks, whose contribution to luminosity is higher than in the less massive galaxies suggestive of different evolutionary paths.
{"title":"Detailed study of galaxies with the stellar counter-rotation phenomenon","authors":"D. Gasymov, I. Katkov","doi":"10.22323/1.425.0017","DOIUrl":"https://doi.org/10.22323/1.425.0017","url":null,"abstract":"The process of galactic disc growing is still not fully understood. In the majority of disk galaxies the gas and stars are located in the same plane and rotate in the same direction. However, there are kinematically peculiar galaxies hosting two counter-rotating stellar discs. Their origin is believed to be the result of a past event of accretion of gas followed by star formation. By studying such galaxies we can learn how much material, when, and how, have fallen onto the progenitor galaxy. We identified a sample of 56 counter-rotating galaxies in the MaNGA IFU survey and initiated a follow-up observing campaign at the 6-m telescope (BTA) aiming to determine the stellar population properties of both stellar discs. Our preliminary results suggest the dichotomy of the sample of counter-rotating galaxies. We found that most massive galaxies have extended counter-rotating disks, whose contribution to luminosity is higher than in the less massive galaxies suggestive of different evolutionary paths.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128885725","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}
We study the relation between the luminosities in the CII line at 158 µ m and in the far infrared (FIR) continuum from quasars observed by ALMA at z ≥ 6 and show that the observed relation is better reproduced with a predominance of radiation from an obscured supermassive black hole than with star formation alone. We found that the locus of points in the “CII/FIR–FIR” plane corresponding to the observed set of quasars could be reproduced in our models with the following types of the central ionizing source: (i) a mildly or slightly obscured SMBH with M • > ∼ 10 8 M (cid:12) and a stellar population with bolometric luminosity L ∗ < 3 L • ; (ii) a highly obscured SMBH with M • ∼ 10 6 − 10 8 M (cid:12) and a massive stellar population with bolometric luminosity L ∗ ∼ 300 L • . The Multifaceted Universe: Theory Observations -
{"title":"CII Emission from High-Redshift Quasars As a Signature of Obscured AGNs","authors":"E. Vasiliev, Y. Shchekinov, B. Nath","doi":"10.22323/1.425.0016","DOIUrl":"https://doi.org/10.22323/1.425.0016","url":null,"abstract":"We study the relation between the luminosities in the CII line at 158 µ m and in the far infrared (FIR) continuum from quasars observed by ALMA at z ≥ 6 and show that the observed relation is better reproduced with a predominance of radiation from an obscured supermassive black hole than with star formation alone. We found that the locus of points in the “CII/FIR–FIR” plane corresponding to the observed set of quasars could be reproduced in our models with the following types of the central ionizing source: (i) a mildly or slightly obscured SMBH with M • > ∼ 10 8 M (cid:12) and a stellar population with bolometric luminosity L ∗ < 3 L • ; (ii) a highly obscured SMBH with M • ∼ 10 6 − 10 8 M (cid:12) and a massive stellar population with bolometric luminosity L ∗ ∼ 300 L • . The Multifaceted Universe: Theory Observations -","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132130096","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}
Neutrinos open a new page in multimessenger astronomy along with gravitational-wave events, the heralds of new discoveries in physics. In extragalactic astrophysics, neutrino sources add to the relatively well-studied electromagnetic objects. We have developed a program in C/Python to work with the extragalactic neutrino background. The program cuts out desired areas in the sky in equatorial or galactic coordinates, out of all objects taken from the input catalogs creates samples of potential neutrino sources falling into the given area, calculates the neutrino flux from each source via a number of model neutrino energy spectra for different types of sources, and draws 2D splines of the neutrino flux in the sky with parameterized smoothing, which are then taken as the observed extragalactic neutrino background.
{"title":"An approximation of the observed extragalactic neutrino background","authors":"S. Shirokov, Dmitry Igorevich Solovev","doi":"10.22323/1.425.0034","DOIUrl":"https://doi.org/10.22323/1.425.0034","url":null,"abstract":"Neutrinos open a new page in multimessenger astronomy along with gravitational-wave events, the heralds of new discoveries in physics. In extragalactic astrophysics, neutrino sources add to the relatively well-studied electromagnetic objects. We have developed a program in C/Python to work with the extragalactic neutrino background. The program cuts out desired areas in the sky in equatorial or galactic coordinates, out of all objects taken from the input catalogs creates samples of potential neutrino sources falling into the given area, calculates the neutrino flux from each source via a number of model neutrino energy spectra for different types of sources, and draws 2D splines of the neutrino flux in the sky with parameterized smoothing, which are then taken as the observed extragalactic neutrino background.","PeriodicalId":355234,"journal":{"name":"Proceedings of The Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125557955","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}
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