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Search for Interpulses in a Complete Sample of Pulsars at a Frequency of 111 MHz
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-03-14 DOI: 10.1134/S1063772924701026
M. O. Toropov, S. A. Tyul’bashev, V. S. Beskin
{"title":"Search for Interpulses in a Complete Sample of Pulsars at a Frequency of 111 MHz","authors":"M. O. Toropov,&nbsp;S. A. Tyul’bashev,&nbsp;V. S. Beskin","doi":"10.1134/S1063772924701026","DOIUrl":"10.1134/S1063772924701026","url":null,"abstract":"<p>An interpulse search has been carried out in a sample of 96 pulsars observed on the Large Phased Array (LPA) radio telescope in the Pushchino Multibeams Pulsar Search (PUMPS). The pulsar sample has been complete for pulsars having a signal-to-noise ratio (<span>(S{text{/}}N)</span>) in the main pulse (MP) greater than 40. To search for weak interpulses (IP), the addition of average profiles over an interval of up to 10 years has been used. Interpulses have been detected in 12 pulsars (12.5% of the sample), of which 7 pulsars have an interpulse located near the <span>(180^circ )</span> phase relative to the main pulse (probable orthogonal rotators), and 5 have had phases far from <span>(180^circ )</span> (probable coaxial rotators). The amplitude ratios of IP/MP have been in the range of 0.004‒0.023, the median value is 0.01. Estimates of the observed number of coaxial and orthogonal rotators with IP/MP of <span>({kern 1pt} geqslant {kern 1pt} 0.01)</span> have not contradicted the model according to which, during evolution, the magnetic axis and the rotation axis become orthogonal.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 12","pages":"1191 - 1198"},"PeriodicalIF":1.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622074","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
On Massive Black Holes in the Centers of Globular Clusters. I 关于球状星团中心的大质量黑洞。I
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-03-14 DOI: 10.1134/S1063772925701331
S. N. Nuritdinov, S. J. Turaev, K. T. Mirtadjieva
{"title":"On Massive Black Holes in the Centers of Globular Clusters. I","authors":"S. N. Nuritdinov,&nbsp;S. J. Turaev,&nbsp;K. T. Mirtadjieva","doi":"10.1134/S1063772925701331","DOIUrl":"10.1134/S1063772925701331","url":null,"abstract":"<p>In this paper, a sample of globular clusters (GCs), for which the masses of black holes in their centers are known from observations, has been created. The dependence of the main characteristics of GCs on the mass of black holes has been studied. Based on observational data on the surface density of GCs, the degree of concentration of stars to their center has been determined. The obtained degree of concentration has been used as an indicator of the presence of black holes.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 12","pages":"1385 - 1389"},"PeriodicalIF":1.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621827","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
Search for Pulsars with Periods of More Than Two Seconds at Declinations from +21° to +42°
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-03-14 DOI: 10.1134/S1063772924701038
S. A. Tyul’bashev, G. E. Tyul’basheva
{"title":"Search for Pulsars with Periods of More Than Two Seconds at Declinations from +21° to +42°","authors":"S. A. Tyul’bashev,&nbsp;G. E. Tyul’basheva","doi":"10.1134/S1063772924701038","DOIUrl":"10.1134/S1063772924701038","url":null,"abstract":"<p>The search for long period transients with periods (<span>(P)</span>) from 2 to 90 s was carried out in daily observations conducted in an area of 6300 sq. deg. The data was obtained using a Large Phased Array (LPA) at a frequency of 111 MHz. Periodograms calculated using the Fast Folding Algorithm (FFA) were used for the search. To increase the sensitivity, the periodograms obtained in different observation sessions were added. Of the 14 known pulsars that entered the study area, having periods of <span>(P &gt; 2)</span> s and dispersion measures (<span>(DM)</span>) less than 200 pc/cm<sup>3</sup>, nine were detected. Two new pulsars were found. The average profiles of pulsars are obtained and estimates of their flux density are given. Discovered pulsar J1951+28 with a period of <span>(P = 7.3342)</span> s and <span>(DM)</span> = 3.5 pc/cm<sup>3</sup> turned out to be one of the closest pulsars to the Sun. The absence of new long period transients (pulsars or white dwarf) with periods of tens of seconds with the achieved sensitivity of searching for 1 mJy outside the galactic plane indicates a low probability of the existence of pulsars of neutron stars with extremely long periods. Most likely, the recently found sources of periodic radiation with periods from a minute to tens of minutes are white dwarfs pulsars.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 12","pages":"1199 - 1208"},"PeriodicalIF":1.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621762","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
The Problems of Modern Cosmology: The Very Early Universe
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701221
G. S. Bisnovatyi-Kogan
{"title":"The Problems of Modern Cosmology: The Very Early Universe","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701221","DOIUrl":"10.1134/S1063772924701221","url":null,"abstract":"<p>The paper discusses the main problems of modern cosmology, particularly those related to the very early universe.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S110 - S121"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496762","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
Evolution of Massive Stars and Supernovae
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701154
G. S. Bisnovatyi-Kogan
{"title":"Evolution of Massive Stars and Supernovae","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701154","DOIUrl":"10.1134/S1063772924701154","url":null,"abstract":"<p>The paper reviews the various stages of stellar evolution and the final stages of this evolution. The nuclear evolution of massive stars, the dynamic stability and critical states of stars of various masses, supernova explosions and their mechanisms, particularly the magneto-rotational model, are considered. The connection between cosmic gamma-ray bursts and supernovae is discussed.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S56 - S68"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496768","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
Accretion onto Neutron Stars
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701129
G. S. Bisnovatyi-Kogan
{"title":"Accretion onto Neutron Stars","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701129","DOIUrl":"10.1134/S1063772924701129","url":null,"abstract":"<p>The basic principles of accretion onto a magnetized neutron star are considered: Alfvén surface, instability, hot spot, accretor and propeller, spin-up of stars during disk accretion, stationary period, shielding of magnetic fields, boundary layer, accretion onto a rapidly rotating star with a weak magnetic field.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S31 - S35"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496765","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
Cosmomicrophysics
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701208
G. S. Bisnovatyi-Kogan
{"title":"Cosmomicrophysics","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701208","DOIUrl":"10.1134/S1063772924701208","url":null,"abstract":"<p>The paper discusses the relation between the processes of the microworld and the macroworld. Constraints on the rest mass of neutrinos and on the number of low-mass weakly interacting particles are described.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S97 - S101"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496962","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
Background Components of the Universe
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S106377292470121X
G. S. Bisnovatyi-Kogan
{"title":"Background Components of the Universe","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S106377292470121X","DOIUrl":"10.1134/S106377292470121X","url":null,"abstract":"<p>The paper examines various background components of the universe, such as relic photons, neutrinos and gravitons, primordial black holes, gravitational waves, and cosmic rays.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S102 - S109"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496761","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
Accretion onto Black Holes. II
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701105
G. S. Bisnovatyi-Kogan
{"title":"Accretion onto Black Holes. II","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701105","DOIUrl":"10.1134/S1063772924701105","url":null,"abstract":"<p>The paper is a continuation of a review of accretion phenomena in systems with black holes. A Roche lobe, disk accretion onto a black hole, a standard solution for an accretion disk, optically thick and optically thin models, emission spectra of accretion disks, mechanisms of turbulence excitation, advective disks, the Blandford–Znajek process are considered.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S19 - S25"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496763","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
Observations of Relativistic Objects
IF 1.1 4区 物理与天体物理
Astronomy Reports Pub Date : 2025-02-26 DOI: 10.1134/S1063772924701117
G. S. Bisnovatyi-Kogan
{"title":"Observations of Relativistic Objects","authors":"G. S. Bisnovatyi-Kogan","doi":"10.1134/S1063772924701117","DOIUrl":"10.1134/S1063772924701117","url":null,"abstract":"<p>Basic information is provided on observations of relativistic objects, including white dwarfs, radio pulsars, recycled pulsars, black holes in binary systems, microquasars, X-ray pulsars and X-ray bursters.</p>","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"68 1 supplement","pages":"S26 - S30"},"PeriodicalIF":1.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496764","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
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